Everyday Science MCQs – Set 9
Practice 20 important Everyday Science MCQs covering human biology, nutrition, chemistry, physics, plants, weather, earth science and astronomy. Click Show Correct Answer to reveal the answer with a short explanation.
1. Which part of the human ear helps maintain balance?
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Correct Answer: B. Semicircular canals
The semicircular canals detect rotational movements of the head and help the body maintain balance.
The semicircular canals detect rotational movements of the head and help the body maintain balance.
2. Which blood group is commonly known as the universal red-cell donor type?
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Correct Answer: C. O negative
O-negative red blood cells lack A, B and RhD antigens and can often be given in emergencies when the recipient's blood type is unknown.
O-negative red blood cells lack A, B and RhD antigens and can often be given in emergencies when the recipient's blood type is unknown.
3. Which organelle is often called the powerhouse of the cell?
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Correct Answer: C. Mitochondrion
Mitochondria produce most of the cell's ATP, the main energy-carrying molecule used for cellular activities.
Mitochondria produce most of the cell's ATP, the main energy-carrying molecule used for cellular activities.
4. Which structure in a plant cell contains chlorophyll?
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Correct Answer: A. Chloroplast
Chloroplasts contain chlorophyll and are the main sites of photosynthesis in green plant cells.
Chloroplasts contain chlorophyll and are the main sites of photosynthesis in green plant cells.
5. Which deficiency can lead to night blindness?
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Correct Answer: A. Vitamin A deficiency
Vitamin A is important for normal vision, and severe deficiency can impair vision in dim light.
Vitamin A is important for normal vision, and severe deficiency can impair vision in dim light.
6. Which chemical element has the symbol K?
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Correct Answer: B. Potassium
K is the chemical symbol for potassium and comes from the Latin name "kalium."
K is the chemical symbol for potassium and comes from the Latin name "kalium."
7. Which gas is commonly used to make soft drinks fizzy?
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Correct Answer: C. Carbon dioxide
Carbon dioxide dissolves under pressure in many soft drinks and forms bubbles when the pressure is released.
Carbon dioxide dissolves under pressure in many soft drinks and forms bubbles when the pressure is released.
8. Which type of substance has a pH below 7?
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Correct Answer: A. Acidic substance
On the usual aqueous pH scale, values below 7 indicate an acidic solution at about 25°C.
On the usual aqueous pH scale, values below 7 indicate an acidic solution at about 25°C.
9. Which gas is used by plants as a raw material during photosynthesis?
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Correct Answer: A. Carbon dioxide
Plants take in carbon dioxide from the air and use its carbon to make organic compounds during photosynthesis.
Plants take in carbon dioxide from the air and use its carbon to make organic compounds during photosynthesis.
10. Which material is a poor conductor of heat and is often used for insulating handles?
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Correct Answer: C. Plastic
Plastic is generally a poor conductor of heat, so it can be used as an insulating material for handles and other applications.
Plastic is generally a poor conductor of heat, so it can be used as an insulating material for handles and other applications.
11. What is the approximate acceleration due to gravity near Earth's surface?
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Correct Answer: C. 9.8 m/s²
Near Earth's surface, the acceleration due to gravity is approximately 9.8 metres per second squared.
Near Earth's surface, the acceleration due to gravity is approximately 9.8 metres per second squared.
12. Which type of motion does a simple pendulum repeat at regular intervals?
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Correct Answer: B. Periodic motion
A pendulum repeats its oscillatory motion at regular time intervals, making it an example of periodic motion.
A pendulum repeats its oscillatory motion at regular time intervals, making it an example of periodic motion.
13. Which electrical appliance mainly converts electrical energy into heat energy?
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Correct Answer: A. Electric heater
An electric heater uses electrical energy to produce thermal energy, mainly through the resistance of its heating element.
An electric heater uses electrical energy to produce thermal energy, mainly through the resistance of its heating element.
14. Which colour of an object reflects most of the visible light falling on it when it appears white?
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Correct Answer: A. Most visible wavelengths
A white object appears white because it reflects most of the visible wavelengths of light rather than absorbing one main colour.
A white object appears white because it reflects most of the visible wavelengths of light rather than absorbing one main colour.
15. Which type of cloud is commonly associated with thunderstorms?
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Correct Answer: B. Cumulonimbus
Cumulonimbus clouds can grow to great heights and are strongly associated with thunderstorms, heavy rain and lightning.
Cumulonimbus clouds can grow to great heights and are strongly associated with thunderstorms, heavy rain and lightning.
16. Which scale is commonly used to describe the acidity or alkalinity of a solution?
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Correct Answer: B. pH scale
The pH scale is used to express how acidic or alkaline an aqueous solution is.
The pH scale is used to express how acidic or alkaline an aqueous solution is.
17. Which planet has the largest volcano known in the Solar System, Olympus Mons?
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Correct Answer: B. Mars
Olympus Mons is a giant shield volcano on Mars and is the largest known volcano in the Solar System.
Olympus Mons is a giant shield volcano on Mars and is the largest known volcano in the Solar System.
18. What is the name of the imaginary line that divides Earth into the Northern and Southern Hemispheres?
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Correct Answer: C. Equator
The Equator is an imaginary line at 0° latitude that divides Earth into the Northern and Southern Hemispheres.
The Equator is an imaginary line at 0° latitude that divides Earth into the Northern and Southern Hemispheres.
19. Which plant tissue transports sugars from leaves to other parts of the plant?
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Correct Answer: B. Phloem
Phloem transports sugars and other organic nutrients produced by leaves to growing and storage tissues throughout the plant.
Phloem transports sugars and other organic nutrients produced by leaves to growing and storage tissues throughout the plant.
20. Which gas makes up most of the air exhaled by humans?
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Correct Answer: B. Nitrogen
Nitrogen makes up the largest portion of both inhaled and exhaled air, although exhaled air contains more carbon dioxide and less oxygen than inhaled air.
Nitrogen makes up the largest portion of both inhaled and exhaled air, although exhaled air contains more carbon dioxide and less oxygen than inhaled air.
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