Top 100 Everyday Science MCQs with Explanation
Comprehensive General Science Question Bank for Government & Competitive Exams
UPSC
State PSC
SSC CGL
RRB / Banking
Attempted0/100
Correct0
Wrong0
Accuracy0%
Quick Navigation
Q-1: Which vitamin is essential for the health of the human eye and prevents night blindness? (Top 100 Everyday Science MCQs)
a. Vitamin B12
b. Vitamin C
c. Vitamin A
d. Vitamin K
Answer: c. Vitamin A
Vitamin A, also known as Retinol, is crucial for maintaining clear vision and a healthy cornea. A deficiency in this vitamin leads to Xerophthalmia and night blindness. It is commonly found in carrots, sweet potatoes, and leafy greens.
Vitamin A, also known as Retinol, is crucial for maintaining clear vision and a healthy cornea. A deficiency in this vitamin leads to Xerophthalmia and night blindness. It is commonly found in carrots, sweet potatoes, and leafy greens.
Q-2: A person suffering from ‘Myopia’ (short-sightedness) requires which type of lens for correction? (Top 100 Everyday Science MCQs)
a. Convex lens
b. Concave lens
c. Cylindrical lens
d. Bifocal lens
Answer: b. Concave lens
In Myopia, the image of a distant object is formed in front of the retina rather than on it. A concave lens (diverging lens) is used to shift the image back onto the retina. This is a very common defect of vision in the human eye.
In Myopia, the image of a distant object is formed in front of the retina rather than on it. A concave lens (diverging lens) is used to shift the image back onto the retina. This is a very common defect of vision in the human eye.
Q-3: What is the normal pH value of human blood? (Top 100 Everyday Science MCQs)
a. 6.4
b. 7.4
c. 8.4
d. 7.0
Answer: b. 7.4
Human blood is slightly basic, with a normal pH range of approximately 7.35 to 7.45. Significant deviations from this range can lead to serious health complications or even death. The body uses buffer systems to maintain this narrow pH window.
Human blood is slightly basic, with a normal pH range of approximately 7.35 to 7.45. Significant deviations from this range can lead to serious health complications or even death. The body uses buffer systems to maintain this narrow pH window.
Q-4: Which gland in the human body is popularly known as the ‘Master Gland’? (Top 100 Everyday Science MCQs)
a. Thyroid gland
b. Pancreas
c. Pituitary gland
d. Adrenal gland
Answer: c. Pituitary gland
The pituitary gland is called the master gland because it produces hormones that control several other endocrine glands (like the thyroid, adrenals, and gonads). It is a pea-sized structure located at the base of the brain.
The pituitary gland is called the master gland because it produces hormones that control several other endocrine glands (like the thyroid, adrenals, and gonads). It is a pea-sized structure located at the base of the brain.
Q-5: What is the average lifespan of a Red Blood Cell (RBC) in the human body? (Top 100 Everyday Science MCQs)
a. 30 days
b. 60 days
c. 90 days
d. 120 days
Answer: d. 120 days
Red Blood Cells (Erythrocytes) survive in the human circulatory system for approximately 120 days. After this period, older or damaged RBCs are broken down and removed primarily by the spleen, often referred to as the ‘graveyard of RBCs’.
Red Blood Cells (Erythrocytes) survive in the human circulatory system for approximately 120 days. After this period, older or damaged RBCs are broken down and removed primarily by the spleen, often referred to as the ‘graveyard of RBCs’.
Q-6: Which is the largest organ in the human body? (Top 100 Everyday Science MCQs)
a. Skin
b. Liver
c. Brain
d. Heart
Answer: a. Skin
The skin is the largest organ of the human body by surface area and weight. It acts as a protective barrier, regulates body temperature, and allows the sensation of touch. The liver is the largest *internal* organ.
The skin is the largest organ of the human body by surface area and weight. It acts as a protective barrier, regulates body temperature, and allows the sensation of touch. The liver is the largest *internal* organ.
Q-7: Which blood group is known as the “Universal Donor”? (Top 100 Everyday Science MCQs)
a. AB positive
b. A positive
c. O negative
d. B negative
Answer: c. O negative
Type O negative blood is known as the universal donor because it lacks A, B, and Rh antigens on the surface of the red blood cells. Thus, it can be transfused into patients of any other blood type with a minimal risk of rejection.
Type O negative blood is known as the universal donor because it lacks A, B, and Rh antigens on the surface of the red blood cells. Thus, it can be transfused into patients of any other blood type with a minimal risk of rejection.
Q-8: Which vitamin plays a crucial role in the clotting of blood? (Top 100 Everyday Science MCQs)
a. Vitamin A
b. Vitamin B12
c. Vitamin E
d. Vitamin K
Answer: d. Vitamin K
Vitamin K is essential for the synthesis of certain proteins required for blood coagulation (clotting). Without vitamin K, blood coagulation is seriously impaired, leading to uncontrolled bleeding.
Vitamin K is essential for the synthesis of certain proteins required for blood coagulation (clotting). Without vitamin K, blood coagulation is seriously impaired, leading to uncontrolled bleeding.
Q-9: Which cell organelle is known as the “Powerhouse of the cell”? (Top 100 Everyday Science MCQs)
a. Nucleus
b. Mitochondria
c. Ribosome
d. Golgi apparatus
Answer: b. Mitochondria
Mitochondria are known as the powerhouses of the cell because they generate most of the cell’s supply of adenosine triphosphate (ATP), used as a source of chemical energy. They are responsible for cellular respiration.
Mitochondria are known as the powerhouses of the cell because they generate most of the cell’s supply of adenosine triphosphate (ATP), used as a source of chemical energy. They are responsible for cellular respiration.
Q-10: What is the normal body temperature of a healthy human being? (Top 100 Everyday Science MCQs)
a. 96.4°F (35.8°C)
b. 98.6°F (37°C)
c. 100.4°F (38°C)
d. 102.2°F (39°C)
Answer: b. 98.6°F (37°C)
The normal core body temperature of a healthy, resting adult human being is stated to be 98.6 degrees Fahrenheit or 37.0 degrees Celsius. Though it can vary slightly depending on the time of day and the individual.
The normal core body temperature of a healthy, resting adult human being is stated to be 98.6 degrees Fahrenheit or 37.0 degrees Celsius. Though it can vary slightly depending on the time of day and the individual.
The Ultimate All-In-One Preparation Hub
Take the first step toward securing your dream career with the “Optometry Gov Job Preparation” course, exclusively available on the “Optometry Notes & MCQs” app. This course is meticulously structured to provide an all-inclusive preparation experience, ensuring aspiring optometrists have the exact tools, notes, and tests needed to ace highly competitive government exams.
Q-11: What is the approximate speed of light in a vacuum? (Everyday Science MCQs with answers)
a. 300,000 km/h
b. 300,000 km/s
c. 3,000 km/s
d. 30,000 km/s
Answer: b. 300,000 km/s
The speed of light in a vacuum is a fundamental physical constant, exactly 299,792,458 meters per second, which is approximately 300,000 kilometers per second. It is the ultimate speed limit of the universe.
The speed of light in a vacuum is a fundamental physical constant, exactly 299,792,458 meters per second, which is approximately 300,000 kilometers per second. It is the ultimate speed limit of the universe.
Q-12: The SI unit of electrical resistance is: (Everyday Science MCQs with answers)
a. Ampere
b. Volt
c. Ohm
d. Watt
Answer: c. Ohm
The ohm (symbol: Ω) is the SI derived unit of electrical resistance. It is named after the German physicist Georg Simon Ohm, who formulated Ohm’s Law governing the relationship between current, voltage, and resistance.
The ohm (symbol: Ω) is the SI derived unit of electrical resistance. It is named after the German physicist Georg Simon Ohm, who formulated Ohm’s Law governing the relationship between current, voltage, and resistance.
Q-13: Which instrument is used to measure atmospheric pressure? (Everyday Science MCQs with answers)
a. Thermometer
b. Barometer
c. Hygrometer
d. Anemometer
Answer: b. Barometer
A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Changes in the atmosphere’s pressure are used to forecast short-term changes in the weather, such as an approaching storm.
A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Changes in the atmosphere’s pressure are used to forecast short-term changes in the weather, such as an approaching storm.
Q-14: Sound waves cannot travel through: (Everyday Science MCQs with answers)
a. Solid
b. Liquid
c. Gas
d. Vacuum
Answer: d. Vacuum
Sound is a mechanical wave that requires a physical medium (like air, water, or steel) to travel, as it moves by vibrating the particles of the medium. Therefore, sound cannot propagate through the empty space of a vacuum.
Sound is a mechanical wave that requires a physical medium (like air, water, or steel) to travel, as it moves by vibrating the particles of the medium. Therefore, sound cannot propagate through the empty space of a vacuum.
Q-15: What are the three primary colors of light? (Everyday Science MCQs with answers)
a. Red, Blue, Green
b. Red, Yellow, Blue
c. Red, White, Blue
d. Yellow, Green, Blue
Answer: a. Red, Blue, Green
In physics and optics, the primary colors of light are Red, Green, and Blue (RGB). Mixing these three colors of light in different proportions can produce all other colors, and combining all three equally produces white light.
In physics and optics, the primary colors of light are Red, Green, and Blue (RGB). Mixing these three colors of light in different proportions can produce all other colors, and combining all three equally produces white light.
Q-16: A person suffering from ‘Hypermetropia’ (long-sightedness) requires which type of lens for correction? (Everyday Science MCQs with answers)
a. Convex lens
b. Concave lens
c. Cylindrical lens
d. Plano-concave lens
Answer: a. Convex lens
In Hypermetropia, the eye focuses the image of near objects behind the retina. A convex lens (converging lens) is prescribed to bend the light rays inwards before they enter the eye, allowing the image to focus correctly on the retina.
In Hypermetropia, the eye focuses the image of near objects behind the retina. A convex lens (converging lens) is prescribed to bend the light rays inwards before they enter the eye, allowing the image to focus correctly on the retina.
Q-17: The twinkling of stars in the night sky is due to: (Everyday Science MCQs with answers)
a. Reflection of light
b. Atmospheric refraction
c. Interference of light
d. Dispersion of light
Answer: b. Atmospheric refraction
As starlight passes through the Earth’s atmosphere, it is bent (refracted) multiple times by layers of air with varying temperatures and densities. This continuous, random bending causes the light to shift slightly, making the star appear to twinkle.
As starlight passes through the Earth’s atmosphere, it is bent (refracted) multiple times by layers of air with varying temperatures and densities. This continuous, random bending causes the light to shift slightly, making the star appear to twinkle.
Q-18: The SI unit of power is: (Everyday Science MCQs with answers)
a. Joule
b. Watt
c. Newton
d. Pascal
Answer: b. Watt
The watt (symbol: W) is the SI unit of power, named after the Scottish engineer James Watt. It is defined as one joule of energy transferred or dissipated per second (1 W = 1 J/s).
The watt (symbol: W) is the SI unit of power, named after the Scottish engineer James Watt. It is defined as one joule of energy transferred or dissipated per second (1 W = 1 J/s).
Q-19: The immense energy produced by the Sun is the result of which process? (Everyday Science MCQs with answers)
a. Nuclear fission
b. Nuclear fusion
c. Chemical combustion
d. Radioactive decay
Answer: b. Nuclear fusion
The Sun generates energy via nuclear fusion, a process where extreme temperature and pressure in its core cause hydrogen nuclei to fuse together to form helium. This reaction releases a tremendous amount of light and heat energy.
The Sun generates energy via nuclear fusion, a process where extreme temperature and pressure in its core cause hydrogen nuclei to fuse together to form helium. This reaction releases a tremendous amount of light and heat energy.
Q-20: Which of the following is the lightest known gas? (Everyday Science MCQs with answers)
a. Helium
b. Nitrogen
c. Hydrogen
d. Oxygen
Answer: c. Hydrogen
Hydrogen is the lightest chemical element and the lightest known gas in the universe. It consists of just one proton and one electron. Because it is highly flammable, helium (the second lightest) is safer for use in balloons.
Hydrogen is the lightest chemical element and the lightest known gas in the universe. It consists of just one proton and one electron. Because it is highly flammable, helium (the second lightest) is safer for use in balloons.
Q-21: What is the chemical name for common Baking Soda used in kitchens? (General Science questions for competitive exams)
a. Sodium carbonate
b. Sodium bicarbonate
c. Calcium carbonate
d. Sodium chloride
Answer: b. Sodium bicarbonate
The chemical name for baking soda is sodium bicarbonate (NaHCO3). It is a mild base that reacts with acids to produce carbon dioxide gas, which causes dough and batter to rise during baking.
The chemical name for baking soda is sodium bicarbonate (NaHCO3). It is a mild base that reacts with acids to produce carbon dioxide gas, which causes dough and batter to rise during baking.
Q-22: Which gas is commonly known as ‘Laughing Gas’? (General Science questions for competitive exams)
a. Nitrous oxide
b. Nitric oxide
c. Nitrogen dioxide
d. Carbon monoxide
Answer: a. Nitrous oxide
Nitrous oxide (N2O) is colloquially known as laughing gas. It is a colorless, non-flammable gas with a slightly sweet odor and taste. It is widely used in dentistry and surgery for its anesthetic and pain-relieving effects.
Nitrous oxide (N2O) is colloquially known as laughing gas. It is a colorless, non-flammable gas with a slightly sweet odor and taste. It is widely used in dentistry and surgery for its anesthetic and pain-relieving effects.
Q-23: Which is the heaviest naturally occurring element on Earth? (General Science questions for competitive exams)
a. Lead
b. Gold
c. Plutonium
d. Uranium
Answer: d. Uranium
Uranium (atomic number 92) is the heaviest naturally occurring element. It is a dense, radioactive metal used primarily as a fuel in nuclear power reactors. Elements heavier than uranium are typically synthesized in laboratories.
Uranium (atomic number 92) is the heaviest naturally occurring element. It is a dense, radioactive metal used primarily as a fuel in nuclear power reactors. Elements heavier than uranium are typically synthesized in laboratories.
Q-24: Which gas was historically used as a common refrigerant in older household refrigerators? (General Science questions for competitive exams)
a. Ammonia
b. Nitrogen
c. Freon (CFCs)
d. Methane
Answer: c. Freon (CFCs)
Freon is a trade name for a class of chemicals called chlorofluorocarbons (CFCs). They were widely used as refrigerants until it was discovered that they severely damage the Earth’s protective ozone layer, leading to their global phase-out.
Freon is a trade name for a class of chemicals called chlorofluorocarbons (CFCs). They were widely used as refrigerants until it was discovered that they severely damage the Earth’s protective ozone layer, leading to their global phase-out.
Q-25: The painful sting of an ant or a bee injects which acid into the skin? (General Science questions for competitive exams)
a. Acetic acid
b. Formic acid
c. Citric acid
d. Lactic acid
Answer: b. Formic acid
Formic acid (methanoic acid) is the primary chemical compound responsible for the pain, itching, and swelling associated with ant bites and bee stings. It acts as a natural defense mechanism for these insects.
Formic acid (methanoic acid) is the primary chemical compound responsible for the pain, itching, and swelling associated with ant bites and bee stings. It acts as a natural defense mechanism for these insects.
Q-26: Name the only non-metal that exists as a liquid at standard room temperature. (General Science questions for competitive exams)
a. Bromine
b. Mercury
c. Iodine
d. Chlorine
Answer: a. Bromine
Bromine is a halogen and the only non-metallic element that is a liquid at room temperature. It is a dense, reddish-brown, highly volatile liquid. (Note: Mercury is also a liquid at room temperature, but it is a metal).
Bromine is a halogen and the only non-metallic element that is a liquid at room temperature. It is a dense, reddish-brown, highly volatile liquid. (Note: Mercury is also a liquid at room temperature, but it is a metal).
Q-27: Which of the following is the most significant greenhouse gas responsible for human-caused global warming? (General Science questions for competitive exams)
a. Ozone
b. Nitrogen
c. Carbon dioxide
d. Methane
Answer: c. Carbon dioxide
Carbon dioxide (CO2) is the primary greenhouse gas emitted through human activities, particularly the burning of fossil fuels and deforestation. It traps infrared radiation in the atmosphere, leading to the greenhouse effect and global warming.
Carbon dioxide (CO2) is the primary greenhouse gas emitted through human activities, particularly the burning of fossil fuels and deforestation. It traps infrared radiation in the atmosphere, leading to the greenhouse effect and global warming.
Q-28: The rusting of iron is a classic example of which chemical process? (General Science questions for competitive exams)
a. Reduction
b. Oxidation
c. Sublimation
d. Condensation
Answer: b. Oxidation
Rusting is an electrochemical oxidation process where iron reacts with oxygen in the presence of water or moisture to form iron oxides. This is why exposing iron to damp air causes it to rust and deteriorate.
Rusting is an electrochemical oxidation process where iron reacts with oxygen in the presence of water or moisture to form iron oxides. This is why exposing iron to damp air causes it to rust and deteriorate.
Q-29: What is the main combustible component of biogas and natural gas? (General Science questions for competitive exams)
a. Butane
b. Propane
c. Ethane
d. Methane
Answer: d. Methane
Methane (CH4) is the primary constituent of both natural gas and biogas (produced by the anaerobic breakdown of organic matter). It is highly flammable and is burned as a fuel to provide heat and electricity.
Methane (CH4) is the primary constituent of both natural gas and biogas (produced by the anaerobic breakdown of organic matter). It is highly flammable and is burned as a fuel to provide heat and electricity.
Q-30: What is the chemical formula for a single molecule of water? (General Science questions for competitive exams)
a. HO2
b. H2O
c. H2O2
d. CO2
Answer: b. H2O
Water is composed of two hydrogen atoms covalently bonded to one oxygen atom, giving it the chemical formula H2O. This simple polar molecule is essential for all known forms of life on Earth.
Water is composed of two hydrogen atoms covalently bonded to one oxygen atom, giving it the chemical formula H2O. This simple polar molecule is essential for all known forms of life on Earth.
Simulate the Real Exam with Mock Tests
Eliminate exam anxiety and build your confidence using our Subject-Wise Mock Tests. Designed to mirror the pressure and format of actual optometry government exams, these mock exams available in the “Optometry Notes & MCQs” app will help you perfect your time management and strategy.
Q-31: The disease ‘Scurvy’, characterized by bleeding gums, is caused by the severe deficiency of which vitamin? (Everyday Science objective questions PDF)
a. Vitamin A
b. Vitamin B complex
c. Vitamin C
d. Vitamin D
Answer: c. Vitamin C
Scurvy is a disease caused by a severe lack of Vitamin C (ascorbic acid) in the diet. Vitamin C is vital for synthesizing collagen, a protein essential for the structure of skin, blood vessels, and gums.
Scurvy is a disease caused by a severe lack of Vitamin C (ascorbic acid) in the diet. Vitamin C is vital for synthesizing collagen, a protein essential for the structure of skin, blood vessels, and gums.
Q-32: Goiter is a condition that causes swelling of the thyroid gland due to the deficiency of? (Everyday Science objective questions PDF)
a. Iron
b. Iodine
c. Calcium
d. Potassium
Answer: b. Iodine
Iodine is a crucial trace element needed by the thyroid gland to produce thyroid hormones. When iodine is deficient in the diet, the thyroid gland enlarges abnormally (forming a goiter) as it struggles to produce enough hormones.
Iodine is a crucial trace element needed by the thyroid gland to produce thyroid hormones. When iodine is deficient in the diet, the thyroid gland enlarges abnormally (forming a goiter) as it struggles to produce enough hormones.
Q-33: Malaria is an infectious disease caused by which type of pathogen? (Everyday Science objective questions PDF)
a. Virus
b. Bacteria
c. Protozoan Parasite
d. Fungus
Answer: c. Protozoan Parasite
Malaria is a life-threatening disease caused by Plasmodium parasites. These microscopic protozoans are transmitted to people through the bites of infected female Anopheles mosquitoes.
Malaria is a life-threatening disease caused by Plasmodium parasites. These microscopic protozoans are transmitted to people through the bites of infected female Anopheles mosquitoes.
Q-34: In the human body, the hormone ‘Insulin’ is secreted by which organ? (Everyday Science objective questions PDF)
a. Liver
b. Kidney
c. Pancreas
d. Stomach
Answer: c. Pancreas
Insulin is a hormone produced by the beta cells of the islets of Langerhans in the pancreas. It is essential for regulating blood glucose levels by helping cells absorb glucose for energy. A lack of insulin leads to diabetes.
Insulin is a hormone produced by the beta cells of the islets of Langerhans in the pancreas. It is essential for regulating blood glucose levels by helping cells absorb glucose for energy. A lack of insulin leads to diabetes.
Q-35: Typhoid fever is a serious bacterial infection that spreads primarily through: (Everyday Science objective questions PDF)
a. Mosquito bites
b. Airborne droplets
c. Contaminated food and water
d. Direct skin contact
Answer: c. Contaminated food and water
Typhoid is caused by the bacterium *Salmonella* Typhi. It is a highly contagious disease that is predominantly transmitted through the ingestion of food or water contaminated with the feces of an infected person.
Typhoid is caused by the bacterium *Salmonella* Typhi. It is a highly contagious disease that is predominantly transmitted through the ingestion of food or water contaminated with the feces of an infected person.
Q-36: Rickets, a condition resulting in weak or soft bones in children, is caused by a deficiency of: (Everyday Science objective questions PDF)
a. Vitamin A
b. Vitamin B
c. Vitamin C
d. Vitamin D
Answer: d. Vitamin D
Vitamin D is essential for the absorption of calcium and phosphorus from the diet, which are necessary for healthy bone development. A prolonged deficiency leads to rickets in children, resulting in skeletal deformities.
Vitamin D is essential for the absorption of calcium and phosphorus from the diet, which are necessary for healthy bone development. A prolonged deficiency leads to rickets in children, resulting in skeletal deformities.
Q-37: Which is the largest gland in the human body, responsible for detoxification and bile production? (Everyday Science objective questions PDF)
a. Pancreas
b. Liver
c. Thyroid
d. Spleen
Answer: b. Liver
The liver is the largest internal organ and the largest gland in the human body. It performs over 500 vital functions, including filtering toxins from the blood, processing nutrients, and producing bile to help digest fats.
The liver is the largest internal organ and the largest gland in the human body. It performs over 500 vital functions, including filtering toxins from the blood, processing nutrients, and producing bile to help digest fats.
Q-38: What is considered the normal, healthy blood pressure reading for a resting adult? (Everyday Science objective questions PDF)
a. 100/60 mmHg
b. 120/80 mmHg
c. 140/90 mmHg
d. 160/100 mmHg
Answer: b. 120/80 mmHg
A normal blood pressure reading is typically around 120 over 80 millimeters of mercury (mmHg). The top number is the systolic pressure (when the heart beats), and the bottom number is the diastolic pressure (when the heart rests).
A normal blood pressure reading is typically around 120 over 80 millimeters of mercury (mmHg). The top number is the systolic pressure (when the heart beats), and the bottom number is the diastolic pressure (when the heart rests).
Q-39: The deadly viral disease ‘Rabies’ is most commonly transmitted to humans by: (Everyday Science objective questions PDF)
a. Contaminated water
b. Animal bites (especially dogs)
c. Mosquitoes
d. Airborne transmission
Answer: b. Animal bites (especially dogs)
Rabies is a preventable viral disease of mammals that infects the central nervous system. It is almost always transmitted to humans through the saliva of infected animals via a bite or a deep scratch, with dogs being the most common source globally.
Rabies is a preventable viral disease of mammals that infects the central nervous system. It is almost always transmitted to humans through the saliva of infected animals via a bite or a deep scratch, with dogs being the most common source globally.
Q-40: Anemia is a common blood disorder most frequently caused by a deficiency of which mineral? (Everyday Science objective questions PDF)
a. Calcium
b. Iron
c. Zinc
d. Magnesium
Answer: b. Iron
Iron is a vital component of hemoglobin, the protein in red blood cells that carries oxygen from the lungs to the rest of the body. A lack of iron leads to iron-deficiency anemia, causing extreme fatigue and weakness.
Iron is a vital component of hemoglobin, the protein in red blood cells that carries oxygen from the lungs to the rest of the body. A lack of iron leads to iron-deficiency anemia, causing extreme fatigue and weakness.
Q-41: The biological process by which green plants synthesize their own food using sunlight is called: (Basic Science MCQs for SSC CGL)
a. Respiration
b. Transpiration
c. Photosynthesis
d. Fermentation
Answer: c. Photosynthesis
Photosynthesis is the process used by plants, algae, and certain bacteria to harness energy from sunlight and turn it into chemical energy. They use carbon dioxide and water to produce glucose (food) and oxygen.
Photosynthesis is the process used by plants, algae, and certain bacteria to harness energy from sunlight and turn it into chemical energy. They use carbon dioxide and water to produce glucose (food) and oxygen.
Q-42: Which essential gas do plants release into the atmosphere as a byproduct of photosynthesis? (Basic Science MCQs for SSC CGL)
a. Carbon dioxide
b. Oxygen
c. Nitrogen
d. Hydrogen
Answer: b. Oxygen
During photosynthesis, plants absorb carbon dioxide from the air and water from the soil. Using the energy of sunlight, they convert these into glucose. Oxygen gas is released as a vital waste product of this chemical reaction.
During photosynthesis, plants absorb carbon dioxide from the air and water from the soil. Using the energy of sunlight, they convert these into glucose. Oxygen gas is released as a vital waste product of this chemical reaction.
Q-43: The green color of plant leaves is due to the presence of which crucial pigment? (Basic Science MCQs for SSC CGL)
a. Carotene
b. Xanthophyll
c. Chlorophyll
d. Anthocyanin
Answer: c. Chlorophyll
Chlorophyll is the green pigment found in the chloroplasts of plants. It is essential for photosynthesis as it effectively absorbs light energy from the sun, particularly in the blue and red wavelengths, while reflecting green.
Chlorophyll is the green pigment found in the chloroplasts of plants. It is essential for photosynthesis as it effectively absorbs light energy from the sun, particularly in the blue and red wavelengths, while reflecting green.
Q-44: The scientific study of plant life is formally known as: (Basic Science MCQs for SSC CGL)
a. Zoology
b. Botany
c. Ecology
d. Genetics
Answer: b. Botany
Botany, also called plant science or plant biology, is the branch of biology that deals with the scientific study of plant life. It encompasses the study of their structure, properties, and biochemical processes.
Botany, also called plant science or plant biology, is the branch of biology that deals with the scientific study of plant life. It encompasses the study of their structure, properties, and biochemical processes.
Q-45: Which vascular tissue in plants is responsible for transporting water and dissolved minerals from the roots to the rest of the plant? (Basic Science MCQs for SSC CGL)
a. Phloem
b. Xylem
c. Cambium
d. Epidermis
Answer: b. Xylem
The xylem is a specialized vascular tissue in plants that acts like a plumbing system, drawing water and dissolved minerals upwards from the roots to the stems and leaves. Phloem, on the other hand, transports food (sugars) made in the leaves.
The xylem is a specialized vascular tissue in plants that acts like a plumbing system, drawing water and dissolved minerals upwards from the roots to the stems and leaves. Phloem, on the other hand, transports food (sugars) made in the leaves.
Q-46: Botanically speaking, the edible part of a common potato is a modified: (Basic Science MCQs for SSC CGL)
a. Root
b. Stem
c. Leaf
d. Fruit
Answer: b. Stem
Although it grows underground, a potato is technically a tuber, which is an enlarged, swollen underground stem. It serves as a storage organ for starches, helping the plant survive winter or dry months.
Although it grows underground, a potato is technically a tuber, which is an enlarged, swollen underground stem. It serves as a storage organ for starches, helping the plant survive winter or dry months.
Q-47: The Pitcher plant survives in nutrient-poor soil by employing which unique adaptation? (Basic Science MCQs for SSC CGL)
a. It develops very deep roots
b. It performs photosynthesis at night
c. It is a carnivorous plant that traps and digests insects
d. It absorbs nutrients from neighboring plants
Answer: c. It is a carnivorous plant that traps and digests insects
Pitcher plants typically grow in bogs where the soil lacks essential nutrients like nitrogen. They have modified leaves shaped like pitchers that trap insects. Enzymes or bacteria digest the prey to extract necessary nutrients.
Pitcher plants typically grow in bogs where the soil lacks essential nutrients like nitrogen. They have modified leaves shaped like pitchers that trap insects. Enzymes or bacteria digest the prey to extract necessary nutrients.
Q-48: Yeast, a single-celled fungus used in baking, reproduces asexually through a process called: (Basic Science MCQs for SSC CGL)
a. Binary fission
b. Budding
c. Spore formation
d. Fragmentation
Answer: b. Budding
In yeast, reproduction primarily occurs through budding. A small bulb-like projection (a bud) emerges from the parent cell, receives a copy of the nucleus, grows, and eventually pinches off to form a new independent yeast cell.
In yeast, reproduction primarily occurs through budding. A small bulb-like projection (a bud) emerges from the parent cell, receives a copy of the nucleus, grows, and eventually pinches off to form a new independent yeast cell.
Q-49: Which of the following is considered the fastest-growing woody plant in the world? (Basic Science MCQs for SSC CGL)
a. Teak
b. Eucalyptus
c. Bamboo
d. Banyan
Answer: c. Bamboo
Bamboo holds the world record as the fastest-growing plant. Some species of bamboo can grow up to 91 centimeters (35 inches) within a 24-hour period, making it a highly sustainable and rapidly renewable resource.
Bamboo holds the world record as the fastest-growing plant. Some species of bamboo can grow up to 91 centimeters (35 inches) within a 24-hour period, making it a highly sustainable and rapidly renewable resource.
Q-50: For a typical seed to germinate successfully, which three environmental factors are absolutely essential? (Basic Science MCQs for SSC CGL)
a. Moisture, optimal temperature, and oxygen
b. Sunlight, soil, and fertilizer
c. Carbon dioxide, moisture, and sunlight
d. Nitrogen, darkness, and moisture
Answer: a. Moisture, optimal temperature, and oxygen
While sunlight and soil nutrients are needed later for growth, the initial stage of seed germination primarily requires water (to activate enzymes), oxygen (for cellular respiration to generate energy), and a suitable temperature.
While sunlight and soil nutrients are needed later for growth, the initial stage of seed germination primarily requires water (to activate enzymes), oxygen (for cellular respiration to generate energy), and a suitable temperature.
Q-51: Which is the closest planet to the Sun in our Solar System? (Everyday Science GK questions and answers)
a. Venus
b. Earth
c. Mercury
d. Mars
Answer: c. Mercury
Mercury is the innermost and smallest planet in the Solar System. Due to its proximity to the Sun, it has a very short orbital period (a “year” is only 88 Earth days) and experiences extreme temperature fluctuations.
Mercury is the innermost and smallest planet in the Solar System. Due to its proximity to the Sun, it has a very short orbital period (a “year” is only 88 Earth days) and experiences extreme temperature fluctuations.
Q-52: Which planet is widely known as the “Red Planet” due to its iron oxide-rich surface? (Everyday Science GK questions and answers)
a. Jupiter
b. Mars
c. Saturn
d. Venus
Answer: b. Mars
Mars is called the Red Planet because its surface is heavily covered in iron oxide dust (rust). This gives the planet a distinct reddish appearance when viewed from Earth, even to the naked eye.
Mars is called the Red Planet because its surface is heavily covered in iron oxide dust (rust). This gives the planet a distinct reddish appearance when viewed from Earth, even to the naked eye.
Q-53: What is the largest planet in our Solar System? (Everyday Science GK questions and answers)
a. Saturn
b. Neptune
c. Uranus
d. Jupiter
Answer: d. Jupiter
Jupiter is the largest planet in the Solar System, a gas giant with a mass more than two and a half times that of all the other planets combined. It is famous for its Great Red Spot, a massive ongoing storm.
Jupiter is the largest planet in the Solar System, a gas giant with a mass more than two and a half times that of all the other planets combined. It is famous for its Great Red Spot, a massive ongoing storm.
Q-54: Our Solar System is located in which galaxy? (Everyday Science GK questions and answers)
a. Andromeda
b. Milky Way
c. Sombrero
d. Triangulum
Answer: b. Milky Way
The Solar System resides within the Milky Way galaxy, a barred spiral galaxy. The name describes the galaxy’s appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.
The Solar System resides within the Milky Way galaxy, a barred spiral galaxy. The name describes the galaxy’s appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.
Q-55: What is the Earth’s only natural satellite? (Everyday Science GK questions and answers)
a. Phobos
b. Titan
c. The Moon
d. Europa
Answer: c. The Moon
The Moon is Earth’s only natural satellite. It is the fifth largest satellite in the Solar System and exerts a strong gravitational pull that causes the ocean tides on Earth.
The Moon is Earth’s only natural satellite. It is the fifth largest satellite in the Solar System and exerts a strong gravitational pull that causes the ocean tides on Earth.
Q-56: What is the brightest star visible in the Earth’s night sky? (Everyday Science GK questions and answers)
a. Polaris
b. Sirius
c. Betelgeuse
d. Alpha Centauri
Answer: b. Sirius
Sirius, also known as the Dog Star, is the brightest star in the night sky. It is a binary star system located in the constellation Canis Major and appears so bright because of its intrinsic luminosity and its proximity to the Solar System.
Sirius, also known as the Dog Star, is the brightest star in the night sky. It is a binary star system located in the constellation Canis Major and appears so bright because of its intrinsic luminosity and its proximity to the Solar System.
Q-57: What was the name of the very first artificial Earth satellite, launched in 1957? (Everyday Science GK questions and answers)
a. Apollo 11
b. Explorer 1
c. Sputnik 1
d. Vostok 1
Answer: c. Sputnik 1
Sputnik 1 was the first artificial Earth satellite, launched into an elliptical low Earth orbit by the Soviet Union on October 4, 1957. Its success sparked the space race between the US and the USSR during the Cold War.
Sputnik 1 was the first artificial Earth satellite, launched into an elliptical low Earth orbit by the Soviet Union on October 4, 1957. Its success sparked the space race between the US and the USSR during the Cold War.
Q-58: Despite not being the closest planet to the Sun, which planet is the hottest in the Solar System due to a severe greenhouse effect? (Everyday Science GK questions and answers)
a. Venus
b. Mercury
c. Mars
d. Jupiter
Answer: a. Venus
Venus is the hottest planet because it possesses a thick, dense atmosphere comprised mostly of carbon dioxide, with clouds of sulfuric acid. This creates a runaway greenhouse effect, trapping heat and pushing surface temperatures high enough to melt lead.
Venus is the hottest planet because it possesses a thick, dense atmosphere comprised mostly of carbon dioxide, with clouds of sulfuric acid. This creates a runaway greenhouse effect, trapping heat and pushing surface temperatures high enough to melt lead.
Q-59: The scientific study of the origin, evolution, and eventual fate of the universe is called: (Everyday Science GK questions and answers)
a. Astrology
b. Cosmology
c. Geology
d. Meteorology
Answer: b. Cosmology
Cosmology is a branch of astronomy that involves the scientific study of the large-scale properties of the universe as a whole, including its origins (the Big Bang), its dynamics, and its ultimate fate.
Cosmology is a branch of astronomy that involves the scientific study of the large-scale properties of the universe as a whole, including its origins (the Big Bang), its dynamics, and its ultimate fate.
Q-60: A ‘Light Year’ is primarily a measurement of: (Everyday Science GK questions and answers)
a. Time
b. Speed
c. Distance
d. Intensity of light
Answer: c. Distance
Despite the word “year,” a light-year is a unit of astronomical distance. It represents the distance that light travels in a vacuum in one Julian year (about 9.46 trillion kilometers). It is used to express astronomical distances to stars and galaxies.
Despite the word “year,” a light-year is a unit of astronomical distance. It represents the distance that light travels in a vacuum in one Julian year (about 9.46 trillion kilometers). It is used to express astronomical distances to stars and galaxies.
Learn from the Past with Previous Year MCQs
Smart studying requires understanding the patterns of the examiners. That is why the “Gov Job Preparation” course includes a dedicated section for “Previous Year MCQs”. By practicing questions that have actually appeared in past optometry government exams, you can anticipate trends and focus on high-yield topics.
Q-61: The world’s first widely used antibiotic, Penicillin, was discovered by which scientist? (DSSSB Everyday Science MCQs)
a. Louis Pasteur
b. Alexander Fleming
c. Robert Koch
d. Edward Jenner
Answer: b. Alexander Fleming
Scottish researcher Sir Alexander Fleming accidentally discovered penicillin in 1928 when he noticed a mold (Penicillium notatum) destroying a bacterial culture in his lab. This revolutionized modern medicine by providing a cure for bacterial infections.
Scottish researcher Sir Alexander Fleming accidentally discovered penicillin in 1928 when he noticed a mold (Penicillium notatum) destroying a bacterial culture in his lab. This revolutionized modern medicine by providing a cure for bacterial infections.
Q-62: Who is credited with the invention of the first practical telephone? (DSSSB Everyday Science MCQs)
a. Thomas Edison
b. Nikola Tesla
c. Alexander Graham Bell
d. Guglielmo Marconi
Answer: c. Alexander Graham Bell
Alexander Graham Bell was a Scottish-born inventor who was awarded the first US patent for the telephone in 1876. His work fundamentally changed global communication.
Alexander Graham Bell was a Scottish-born inventor who was awarded the first US patent for the telephone in 1876. His work fundamentally changed global communication.
Q-63: The phenomenon of natural radioactivity was serendipitously discovered in 1896 by: (DSSSB Everyday Science MCQs)
a. Marie Curie
b. Henri Becquerel
c. Ernest Rutherford
d. Wilhelm Roentgen
Answer: b. Henri Becquerel
French physicist Henri Becquerel discovered radioactivity while working with uranium salts. He noticed that the salts emitted rays that fogged photographic plates wrapped in black paper, independent of sunlight. He later shared the Nobel Prize with Marie and Pierre Curie.
French physicist Henri Becquerel discovered radioactivity while working with uranium salts. He noticed that the salts emitted rays that fogged photographic plates wrapped in black paper, independent of sunlight. He later shared the Nobel Prize with Marie and Pierre Curie.
Q-64: Which British physicist discovered the electron, the first subatomic particle to be identified? (DSSSB Everyday Science MCQs)
a. James Chadwick
b. J. J. Thomson
c. Niels Bohr
d. Max Planck
Answer: b. J. J. Thomson
In 1897, J.J. Thomson discovered the electron during his experiments with cathode ray tubes. This monumental discovery proved that atoms were not indivisible spheres, but contained smaller, negatively charged particles.
In 1897, J.J. Thomson discovered the electron during his experiments with cathode ray tubes. This monumental discovery proved that atoms were not indivisible spheres, but contained smaller, negatively charged particles.
Q-65: Who successfully developed the first safe and effective vaccine against Polio? (DSSSB Everyday Science MCQs)
a. Albert Sabin
b. Jonas Salk
c. Edward Jenner
d. Louis Pasteur
Answer: b. Jonas Salk
Dr. Jonas Salk developed the first successful inactivated polio vaccine (IPV), which came into use in 1955. His vaccine initiated the global eradication of the paralyzing disease. (Albert Sabin later developed the oral polio vaccine).
Dr. Jonas Salk developed the first successful inactivated polio vaccine (IPV), which came into use in 1955. His vaccine initiated the global eradication of the paralyzing disease. (Albert Sabin later developed the oral polio vaccine).
Q-66: The explosive material Dynamite was invented by which famous chemist and engineer? (DSSSB Everyday Science MCQs)
a. Alfred Nobel
b. Antoine Lavoisier
c. Dmitri Mendeleev
d. Fritz Haber
Answer: a. Alfred Nobel
Swedish chemist Alfred Nobel invented dynamite in 1867 by mixing volatile nitroglycerin with an absorbent substance (kieselguhr), making it safer to handle. He later used the massive fortune amassed from his invention to establish the Nobel Prizes.
Swedish chemist Alfred Nobel invented dynamite in 1867 by mixing volatile nitroglycerin with an absorbent substance (kieselguhr), making it safer to handle. He later used the massive fortune amassed from his invention to establish the Nobel Prizes.
Q-67: The ABO blood group system, critical for safe blood transfusions, was discovered by? (DSSSB Everyday Science MCQs)
a. William Harvey
b. Karl Landsteiner
c. Christiaan Barnard
d. Gregor Mendel
Answer: b. Karl Landsteiner
Austrian biologist Karl Landsteiner discovered the ABO blood group system in 1900. His discovery allowed physicians to match patient and donor blood types safely, virtually eliminating the fatal reactions that previously plagued blood transfusions.
Austrian biologist Karl Landsteiner discovered the ABO blood group system in 1900. His discovery allowed physicians to match patient and donor blood types safely, virtually eliminating the fatal reactions that previously plagued blood transfusions.
Q-68: The universal law of gravitation and the three laws of motion were formulated by: (DSSSB Everyday Science MCQs)
a. Albert Einstein
b. Johannes Kepler
c. Galileo Galilei
d. Isaac Newton
Answer: d. Isaac Newton
Sir Isaac Newton published his groundbreaking work, the *Principia Mathematica*, in 1687. In it, he laid out his laws of motion and the law of universal gravitation, forming the foundation of classical mechanics.
Sir Isaac Newton published his groundbreaking work, the *Principia Mathematica*, in 1687. In it, he laid out his laws of motion and the law of universal gravitation, forming the foundation of classical mechanics.
Q-69: X-rays, which revolutionized medical imaging, were discovered in 1895 by: (DSSSB Everyday Science MCQs)
a. Pierre Curie
b. Wilhelm Conrad Roentgen
c. Max Planck
d. J. J. Thomson
Answer: b. Wilhelm Conrad Roentgen
German physicist Wilhelm Conrad Roentgen accidentally discovered X-rays while experimenting with a Crookes tube. He noticed a fluorescent glow on a nearby screen and found that these unknown rays could pass through solid objects, including human tissue.
German physicist Wilhelm Conrad Roentgen accidentally discovered X-rays while experimenting with a Crookes tube. He noticed a fluorescent glow on a nearby screen and found that these unknown rays could pass through solid objects, including human tissue.
Q-70: Who is generally credited with significantly improving the design of the telescope and using it for pioneering astronomical observations? (DSSSB Everyday Science MCQs)
a. Galileo Galilei
b. Nicolaus Copernicus
c. Edwin Hubble
d. Hans Lippershey
Answer: a. Galileo Galilei
While Hans Lippershey is often credited with inventing the first basic telescope, Galileo Galilei significantly improved its magnification. He was the first to use a telescope systematically for astronomy, discovering Jupiter’s moons and the craters on our Moon.
While Hans Lippershey is often credited with inventing the first basic telescope, Galileo Galilei significantly improved its magnification. He was the first to use a telescope systematically for astronomy, discovering Jupiter’s moons and the craters on our Moon.
A Proven Track Record of Real Success
Why gamble with your career when you can study with a proven system? The “Gov Job Preparation” course boasts incredible success stories from real students who have used the “Optometry Notes & MCQs” app to clear their optometry government and licensing exams. Join a winning community that has already paved the way to success.
Q-71: Ice floats on the surface of liquid water primarily because: (Science and Technology MCQs for UPSC)
a. Ice absorbs air bubbles
b. The density of ice is less than that of liquid water
c. Ice repels water molecules
d. Water surface tension pushes it up
Answer: b. The density of ice is less than that of liquid water
Unlike most substances which contract and become denser when freezing, water expands as it turns into ice. The hydrogen bonds form a crystalline lattice structure that spaces molecules further apart, making solid ice about 9% less dense than liquid water.
Unlike most substances which contract and become denser when freezing, water expands as it turns into ice. The hydrogen bonds form a crystalline lattice structure that spaces molecules further apart, making solid ice about 9% less dense than liquid water.
Q-72: An ordinary dry cell battery essentially converts which form of energy into electrical energy? (Science and Technology MCQs for UPSC)
a. Mechanical energy
b. Solar energy
c. Chemical energy
d. Thermal energy
Answer: c. Chemical energy
Batteries store potential energy in the form of chemical bonds. When a circuit is completed, a chemical reaction occurs inside the battery involving the anode, cathode, and electrolyte, which releases electrons to create an electrical current.
Batteries store potential energy in the form of chemical bonds. When a circuit is completed, a chemical reaction occurs inside the battery involving the anode, cathode, and electrolyte, which releases electrons to create an electrical current.
Q-73: Which meteorological instrument is utilized to measure the speed of the wind? (Science and Technology MCQs for UPSC)
a. Barometer
b. Hygrometer
c. Anemometer
d. Galvanometer
Answer: c. Anemometer
An anemometer is a common weather station instrument used to measure wind speed. A typical design features cup-like structures mounted on a spinning axis, where the rate of rotation directly correlates to the wind velocity.
An anemometer is a common weather station instrument used to measure wind speed. A typical design features cup-like structures mounted on a spinning axis, where the rate of rotation directly correlates to the wind velocity.
Q-74: At standard sea-level atmospheric pressure, pure water boils at what temperature on the Fahrenheit scale? (Science and Technology MCQs for UPSC)
a. 100°F
b. 212°F
c. 32°F
d. 273°F
Answer: b. 212°F
While water boils at 100 degrees on the Celsius scale, the equivalent boiling point on the Fahrenheit scale is 212 degrees. The freezing point of water is 32°F (0°C).
While water boils at 100 degrees on the Celsius scale, the equivalent boiling point on the Fahrenheit scale is 212 degrees. The freezing point of water is 32°F (0°C).
Q-75: In the International System of Units (SI), what is the standard unit of force? (Science and Technology MCQs for UPSC)
a. Joule
b. Newton
c. Watt
d. Pascal
Answer: b. Newton
The Newton (N) is the SI unit of force. It is defined based on Newton’s Second Law of Motion: the force required to accelerate a mass of one kilogram at a rate of one meter per second squared (1 N = 1 kg·m/s²).
The Newton (N) is the SI unit of force. It is defined based on Newton’s Second Law of Motion: the force required to accelerate a mass of one kilogram at a rate of one meter per second squared (1 N = 1 kg·m/s²).
Q-76: In physics, what term describes the rate of change of velocity of an object over time? (Science and Technology MCQs for UPSC)
a. Momentum
b. Speed
c. Acceleration
d. Inertia
Answer: c. Acceleration
Acceleration is a vector quantity that represents the rate at which an object changes its velocity. An object is accelerating if it is speeding up, slowing down (deceleration), or changing its direction of motion.
Acceleration is a vector quantity that represents the rate at which an object changes its velocity. An object is accelerating if it is speeding up, slowing down (deceleration), or changing its direction of motion.
Q-77: Which machine converts continuous mechanical energy into electrical energy? (Science and Technology MCQs for UPSC)
a. Electric motor
b. Electric generator (Dynamo)
c. Transformer
d. Rectifier
Answer: b. Electric generator (Dynamo)
An electric generator, or dynamo, uses electromagnetic induction to convert mechanical energy (like from a turbine turned by wind, water, or steam) into electrical current. An electric motor does the exact reverse (electrical to mechanical).
An electric generator, or dynamo, uses electromagnetic induction to convert mechanical energy (like from a turbine turned by wind, water, or steam) into electrical current. An electric motor does the exact reverse (electrical to mechanical).
Q-78: The sky appears blue during the day primarily due to which optical phenomenon? (Science and Technology MCQs for UPSC)
a. Reflection of the oceans
b. Refraction of sunlight
c. Rayleigh scattering
d. Dispersion in clouds
Answer: c. Rayleigh scattering
As white sunlight hits the Earth’s atmosphere, gases and particles scatter the short-wavelength (blue and violet) light in all directions much more effectively than longer wavelengths (red and yellow). This phenomenon is called Rayleigh scattering.
As white sunlight hits the Earth’s atmosphere, gases and particles scatter the short-wavelength (blue and violet) light in all directions much more effectively than longer wavelengths (red and yellow). This phenomenon is called Rayleigh scattering.
Q-79: What is the ultimate primary source of almost all energy found on planet Earth? (Science and Technology MCQs for UPSC)
a. Geothermal heat
b. Fossil fuels
c. The Sun
d. Radioactive decay
Answer: c. The Sun
The Sun is the fundamental source of nearly all energy on Earth. It directly powers the climate and weather systems, and through photosynthesis, it is the original energy source for fossil fuels and the entire global food web.
The Sun is the fundamental source of nearly all energy on Earth. It directly powers the climate and weather systems, and through photosynthesis, it is the original energy source for fossil fuels and the entire global food web.
Q-80: By what primary mechanism does heat transfer efficiently through a solid metal rod? (Science and Technology MCQs for UPSC)
a. Convection
b. Conduction
c. Radiation
d. Advection
Answer: b. Conduction
Conduction is the process of heat transfer through a solid material via direct microscopic collisions of particles and movement of electrons. Hot, vibrating atoms bump into adjacent cooler atoms, passing the thermal energy along the rod.
Conduction is the process of heat transfer through a solid material via direct microscopic collisions of particles and movement of electrons. Hot, vibrating atoms bump into adjacent cooler atoms, passing the thermal energy along the rod.
Q-81: Which gas forms the vast majority (approximately 78%) of the Earth’s atmosphere? (Everyday Science quiz with explanation)
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Argon
Answer: b. Nitrogen
The Earth’s atmosphere is primarily composed of Nitrogen (roughly 78.08%), followed by Oxygen (about 20.95%). Nitrogen is a stable, relatively unreactive gas that dilutes oxygen and prevents rapid burning at the Earth’s surface.
The Earth’s atmosphere is primarily composed of Nitrogen (roughly 78.08%), followed by Oxygen (about 20.95%). Nitrogen is a stable, relatively unreactive gas that dilutes oxygen and prevents rapid burning at the Earth’s surface.
Q-82: The common ore ‘Bauxite’ is primarily mined to extract which commercially important metal? (Everyday Science quiz with explanation)
a. Iron
b. Copper
c. Aluminum
d. Zinc
Answer: c. Aluminum
Bauxite is an aluminum-rich sedimentary rock and the world’s main source of aluminum. It is processed into alumina via the Bayer process, which is then smelted to produce pure aluminum metal.
Bauxite is an aluminum-rich sedimentary rock and the world’s main source of aluminum. It is processed into alumina via the Bayer process, which is then smelted to produce pure aluminum metal.
Q-83: The sour taste of citrus fruits like lemons and oranges is primarily due to the presence of: (Everyday Science quiz with explanation)
a. Lactic acid
b. Acetic acid
c. Tartaric acid
d. Citric acid
Answer: d. Citric acid
Citric acid is a weak organic acid found naturally in high concentrations in citrus fruits. It acts as a natural preservative and gives these fruits their characteristic tart, sour flavor.
Citric acid is a weak organic acid found naturally in high concentrations in citrus fruits. It acts as a natural preservative and gives these fruits their characteristic tart, sour flavor.
Q-84: By mass, what is the most abundant chemical element found in the Earth’s solid crust? (Everyday Science quiz with explanation)
a. Silicon
b. Oxygen
c. Aluminum
d. Iron
Answer: b. Oxygen
Oxygen is the most abundant element in the Earth’s crust, making up nearly 46.6% of its mass. It is highly reactive and is usually found chemically combined with other elements in the form of silicate minerals.
Oxygen is the most abundant element in the Earth’s crust, making up nearly 46.6% of its mass. It is highly reactive and is usually found chemically combined with other elements in the form of silicate minerals.
Q-85: What is universally recognized as the hardest naturally occurring mineral on Earth? (Everyday Science quiz with explanation)
a. Quartz
b. Corundum
c. Diamond
d. Topaz
Answer: c. Diamond
Diamond, an allotrope of carbon, is the hardest known natural material, scoring a perfect 10 on the Mohs scale of mineral hardness. This exceptional hardness is due to its rigid, 3D tetrahedral lattice structure.
Diamond, an allotrope of carbon, is the hardest known natural material, scoring a perfect 10 on the Mohs scale of mineral hardness. This exceptional hardness is due to its rigid, 3D tetrahedral lattice structure.
Q-86: The industrial process of applying a protective zinc coating to steel or iron to prevent rusting is called: (Everyday Science quiz with explanation)
a. Vulcanization
b. Galvanization
c. Anodizing
d. Electroplating
Answer: b. Galvanization
Galvanization is a rust-prevention technique where iron or steel is submerged in a bath of molten zinc. The zinc coating acts as a sacrificial barrier, oxidizing before the iron underneath can rust.
Galvanization is a rust-prevention technique where iron or steel is submerged in a bath of molten zinc. The zinc coating acts as a sacrificial barrier, oxidizing before the iron underneath can rust.
Q-87: The common, durable metal alloy known as ‘Brass’ is a mixture of which two primary elements? (Everyday Science quiz with explanation)
a. Copper and Tin
b. Copper and Zinc
c. Iron and Carbon
d. Lead and Tin
Answer: b. Copper and Zinc
Brass is a metallic alloy that is made of copper and zinc. The proportions of zinc and copper can be varied to create a range of brasses with varying mechanical and electrical properties. (Copper and tin form bronze).
Brass is a metallic alloy that is made of copper and zinc. The proportions of zinc and copper can be varied to create a range of brasses with varying mechanical and electrical properties. (Copper and tin form bronze).
Q-88: In the periodic table, what is the chemical symbol for the precious metal Gold? (Everyday Science quiz with explanation)
a. Ag
b. Au
c. Gd
d. Pt
Answer: b. Au
The chemical symbol for gold is ‘Au’, derived from its Latin name *aurum*, which means “shining dawn.” Ag is the symbol for silver (*argentum*).
The chemical symbol for gold is ‘Au’, derived from its Latin name *aurum*, which means “shining dawn.” Ag is the symbol for silver (*argentum*).
Q-89: Which heavy, non-combustible gas is most commonly loaded into standard fire extinguishers? (Everyday Science quiz with explanation)
a. Oxygen
b. Nitrogen
c. Helium
d. Carbon dioxide
Answer: d. Carbon dioxide
Carbon dioxide (CO2) is widely used in fire extinguishers because it is denser than air and does not support combustion. When sprayed, it blankets the fire, rapidly suffocating it by displacing the oxygen needed to burn.
Carbon dioxide (CO2) is widely used in fire extinguishers because it is denser than air and does not support combustion. When sprayed, it blankets the fire, rapidly suffocating it by displacing the oxygen needed to burn.
Q-90: The writing core of a standard “lead pencil” actually contains no lead, but is made of: (Everyday Science quiz with explanation)
a. Charcoal
b. Graphite
c. Silicon
d. Coal
Answer: b. Graphite
The “lead” in pencils is actually a mixture of clay and graphite (a soft, layered allotrope of carbon). The misnomer dates back to when a massive graphite deposit was discovered in England and was mistakenly thought to be a form of lead.
The “lead” in pencils is actually a mixture of clay and graphite (a soft, layered allotrope of carbon). The misnomer dates back to when a massive graphite deposit was discovered in England and was mistakenly thought to be a form of lead.
Outstanding Results at AIIMS CRE-2025
We deliver results that speak for themselves! In the highly competitive AIIMS CRE-2025 exams, an incredible 9 students successfully secured their spots in the final seat allocation list using our “Optometry Govt Job Preparation” course. Prepare with the course that creates top-tier achievers!
Q-91: How many distinct bones make up the entire skeletal system of a typical adult human? (Most important Everyday Science questions)
a. 196
b. 206
c. 216
d. 270
Answer: b. 206
While a human infant is born with roughly 270 to 300 bones, many of these fuse together during growth and development. By adulthood, the human skeleton typically consists of exactly 206 distinct bones.
While a human infant is born with roughly 270 to 300 bones, many of these fuse together during growth and development. By adulthood, the human skeleton typically consists of exactly 206 distinct bones.
Q-92: What is the largest and heaviest muscle in the human body? (Most important Everyday Science questions)
a. Gluteus maximus
b. Latissimus dorsi
c. Sartorius
d. Biceps femoris
Answer: a. Gluteus maximus
The gluteus maximus is the main extensor muscle of the hip and the largest muscle in the human body. Its massive size is evolutionary, designed to keep the human trunk in an upright posture and generate power during walking or running.
The gluteus maximus is the main extensor muscle of the hip and the largest muscle in the human body. Its massive size is evolutionary, designed to keep the human trunk in an upright posture and generate power during walking or running.
Q-93: What is the general range for a normal resting heart rate in healthy human adults? (Most important Everyday Science questions)
a. 40 to 60 beats per minute
b. 60 to 100 beats per minute
c. 80 to 120 beats per minute
d. 100 to 140 beats per minute
Answer: b. 60 to 100 beats per minute
For most healthy adults, a normal resting heart rate falls between 60 and 100 beats per minute. Highly trained athletes may have resting heart rates closer to 40 beats per minute due to increased cardiovascular efficiency.
For most healthy adults, a normal resting heart rate falls between 60 and 100 beats per minute. Highly trained athletes may have resting heart rates closer to 40 beats per minute due to increased cardiovascular efficiency.
Q-94: The chemical digestion of carbohydrates begins in the mouth due to the presence of which enzyme in human saliva? (Most important Everyday Science questions)
a. Pepsin
b. Lipase
c. Amylase
d. Trypsin
Answer: c. Amylase
Salivary amylase (also known as ptyalin) is an enzyme secreted by the salivary glands. As you chew food, amylase mixes with it and immediately begins breaking down complex starches into simpler sugars like maltose.
Salivary amylase (also known as ptyalin) is an enzyme secreted by the salivary glands. As you chew food, amylase mixes with it and immediately begins breaking down complex starches into simpler sugars like maltose.
Q-95: What is the longest and strongest bone in the human body? (Most important Everyday Science questions)
a. Tibia
b. Humerus
c. Femur
d. Fibula
Answer: c. Femur
The femur, or thigh bone, is the single longest, heaviest, and strongest bone in the human body. It extends from the hip joint down to the knee and is capable of supporting up to 30 times the weight of the human body.
The femur, or thigh bone, is the single longest, heaviest, and strongest bone in the human body. It extends from the hip joint down to the knee and is capable of supporting up to 30 times the weight of the human body.
Q-96: Which vital organ pair is primarily responsible for filtering waste products and excess water from the blood to form urine? (Most important Everyday Science questions)
a. Kidneys
b. Liver
c. Lungs
d. Pancreas
Answer: a. Kidneys
The kidneys are two bean-shaped organs whose primary function is to continuously filter blood plasma. They remove urea, toxins, and excess salts/water, converting them into urine while returning clean blood to circulation.
The kidneys are two bean-shaped organs whose primary function is to continuously filter blood plasma. They remove urea, toxins, and excess salts/water, converting them into urine while returning clean blood to circulation.
Q-97: The colored part of the human eye that dynamically controls the amount of light entering through the pupil is the: (Most important Everyday Science questions)
a. Cornea
b. Retina
c. Lens
d. Iris
Answer: d. Iris
The iris is the pigmented, muscular ring inside the eye. It acts like the aperture of a camera, expanding in dim light to dilate the pupil and contracting in bright light to constrict the pupil, thereby regulating light intake.
The iris is the pigmented, muscular ring inside the eye. It acts like the aperture of a camera, expanding in dim light to dilate the pupil and contracting in bright light to constrict the pupil, thereby regulating light intake.
Q-98: ‘Osteoporosis’ is a degenerative disease related to the weakening of? (Most important Everyday Science questions)
a. Eyes
b. Skin
c. Bones
d. Liver
Answer: c. Bones
Osteoporosis causes bones to become weak and brittle—so brittle that a fall or even mild stresses such as bending over or coughing can cause a fracture. It is common in older adults, particularly women after menopause. Sufficient calcium and Vitamin D intake is crucial for prevention.
Osteoporosis causes bones to become weak and brittle—so brittle that a fall or even mild stresses such as bending over or coughing can cause a fracture. It is common in older adults, particularly women after menopause. Sufficient calcium and Vitamin D intake is crucial for prevention.
Q-99: Which types of mirrors are commonly utilized in the construction of ‘Solar Cookers’ to focus heat? (Most important Everyday Science questions)
a. Convex mirrors
b. Plane mirrors only
c. Concave mirrors only
d. Both Plane and Concave mirrors
Answer: d. Both Plane and Concave mirrors
Many box-type solar cookers use a plane mirror to reflect general sunlight down into the insulated cooker box. However, high-performance parabolic solar cookers specifically use concave mirrors to intensely focus solar radiation onto a single focal point (the cooking pot).
Many box-type solar cookers use a plane mirror to reflect general sunlight down into the insulated cooker box. However, high-performance parabolic solar cookers specifically use concave mirrors to intensely focus solar radiation onto a single focal point (the cooking pot).
Q-100: What creates the ‘Blind Spot’ within the human eye? (Most important Everyday Science questions)
a. Where the optic nerve leaves the eye
b. The center of the retina (Macula)
c. The part of the cornea with no blood vessels
d. The physical shadow of the iris
Answer: a. Where the optic nerve leaves the eye
The blind spot, or optic disc, is a small circular area on the retina where the optic nerve exits the eyeball to connect to the brain. Because there are no light-sensitive photoreceptor cells (rods or cones) at this exit point, the eye is completely “blind” to any image that falls squarely on it. Our brain uses visual data from the other eye to “fill in” the gap.
The blind spot, or optic disc, is a small circular area on the retina where the optic nerve exits the eyeball to connect to the brain. Because there are no light-sensitive photoreceptor cells (rods or cones) at this exit point, the eye is completely “blind” to any image that falls squarely on it. Our brain uses visual data from the other eye to “fill in” the gap.
Explore More in Current Affairs:
0/0
0%
