Everyday Science MCQs – Set 2
Practice 20 important Everyday Science MCQs covering biology, chemistry, physics, human health, plants, energy and environmental science. Click Show Correct Answer to reveal the answer with a short explanation.
1. Which part of the human digestive system absorbs most of the digested nutrients?
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Correct Answer: B. Small intestine
The small intestine contains villi and microvilli that provide a large surface area for the absorption of digested nutrients.
The small intestine contains villi and microvilli that provide a large surface area for the absorption of digested nutrients.
2. Which mineral is essential for the formation of haemoglobin?
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Correct Answer: B. Iron
Iron is an essential component of haemoglobin, the protein that carries oxygen in red blood cells.
Iron is an essential component of haemoglobin, the protein that carries oxygen in red blood cells.
3. Which gland is known as the master gland of the human body?
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Correct Answer: C. Pituitary gland
The pituitary gland produces hormones that regulate several other endocrine glands and important body functions.
The pituitary gland produces hormones that regulate several other endocrine glands and important body functions.
4. Which vitamin is essential for normal blood clotting?
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Correct Answer: D. Vitamin K
Vitamin K is required for the production of several proteins involved in normal blood clotting.
Vitamin K is required for the production of several proteins involved in normal blood clotting.
5. Which acid is present in the human stomach?
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Correct Answer: A. Hydrochloric acid
Hydrochloric acid creates the acidic environment in the stomach that helps digestion and destroys many harmful microorganisms.
Hydrochloric acid creates the acidic environment in the stomach that helps digestion and destroys many harmful microorganisms.
6. What is the pH value of a neutral solution at about 25°C?
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Correct Answer: C. 7
At approximately 25°C, a neutral aqueous solution has a pH value of 7.
At approximately 25°C, a neutral aqueous solution has a pH value of 7.
7. Which metal is liquid at ordinary room temperature?
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Correct Answer: C. Mercury
Mercury has a very low melting point and remains liquid at ordinary room temperature.
Mercury has a very low melting point and remains liquid at ordinary room temperature.
8. Which gas is commonly used in fire extinguishers?
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Correct Answer: B. Carbon dioxide
Carbon dioxide does not support combustion and is used in certain fire extinguishers to help put out suitable fires.
Carbon dioxide does not support combustion and is used in certain fire extinguishers to help put out suitable fires.
9. Which process changes a liquid into a gas from its surface?
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Correct Answer: C. Evaporation
Evaporation is the gradual conversion of a liquid into vapour from its surface, usually below its boiling point.
Evaporation is the gradual conversion of a liquid into vapour from its surface, usually below its boiling point.
10. What type of energy is stored in a stretched rubber band?
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Correct Answer: B. Elastic potential energy
A stretched rubber band stores energy because of its deformation. This stored energy is called elastic potential energy.
A stretched rubber band stores energy because of its deformation. This stored energy is called elastic potential energy.
11. Which simple machine consists of a rigid bar that rotates around a fulcrum?
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Correct Answer: B. Lever
A lever is a rigid bar that rotates around a fixed point called the fulcrum to move a load or apply force.
A lever is a rigid bar that rotates around a fixed point called the fulcrum to move a load or apply force.
12. Which phenomenon causes a pencil to appear bent when partly immersed in water?
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Correct Answer: B. Refraction
Refraction is the change in direction of light when it passes from one medium into another with a different optical density.
Refraction is the change in direction of light when it passes from one medium into another with a different optical density.
13. Which device converts electrical energy into mechanical energy?
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Correct Answer: A. Electric motor
An electric motor converts electrical energy into mechanical energy and produces motion.
An electric motor converts electrical energy into mechanical energy and produces motion.
14. Which part of a plant mainly absorbs water and mineral salts from the soil?
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Correct Answer: C. Root
Roots anchor plants and absorb water and mineral nutrients from the soil, mainly through their root hairs.
Roots anchor plants and absorb water and mineral nutrients from the soil, mainly through their root hairs.
15. Which process allows green plants to convert light energy into chemical energy?
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Correct Answer: B. Photosynthesis
During photosynthesis, green plants use light energy to make food from carbon dioxide and water.
During photosynthesis, green plants use light energy to make food from carbon dioxide and water.
16. Which disease is caused by a deficiency of vitamin C?
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Correct Answer: B. Scurvy
Scurvy results from severe vitamin C deficiency and may cause bleeding gums, poor wound healing and weakness.
Scurvy results from severe vitamin C deficiency and may cause bleeding gums, poor wound healing and weakness.
17. Which instrument is used to record earthquake vibrations?
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Correct Answer: B. Seismograph
A seismograph detects and records ground movements produced by earthquakes and other seismic events.
A seismograph detects and records ground movements produced by earthquakes and other seismic events.
18. Which renewable source of energy uses moving air to generate electricity?
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Correct Answer: B. Wind energy
Wind turbines convert the kinetic energy of moving air into mechanical energy and then into electrical energy.
Wind turbines convert the kinetic energy of moving air into mechanical energy and then into electrical energy.
19. Which instrument is used to measure humidity in the atmosphere?
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Correct Answer: C. Hygrometer
A hygrometer is an instrument used to measure the amount of water vapour or humidity in the air.
A hygrometer is an instrument used to measure the amount of water vapour or humidity in the air.
20. Which atmospheric phenomenon produces a bright flash of light during a thunderstorm?
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Correct Answer: B. Lightning
Lightning is a powerful electrical discharge in the atmosphere that produces a bright flash of light during thunderstorms.
Lightning is a powerful electrical discharge in the atmosphere that produces a bright flash of light during thunderstorms.
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