Everyday Science MCQs – Set 7
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 respiratory system contains the vocal cords?
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Correct Answer: B. Larynx
The larynx, or voice box, contains the vocal cords and plays an important role in producing sound.
The larynx, or voice box, contains the vocal cords and plays an important role in producing sound.
2. Which part of the digestive system absorbs most of the remaining water from undigested food?
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Correct Answer: B. Large intestine
The large intestine absorbs water and electrolytes from the remaining material before waste is eliminated.
The large intestine absorbs water and electrolytes from the remaining material before waste is eliminated.
3. Which nutrient is primarily needed for growth and repair of body tissues?
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Correct Answer: A. Protein
Proteins provide amino acids that the body uses to build and repair muscles, organs and other tissues.
Proteins provide amino acids that the body uses to build and repair muscles, organs and other tissues.
4. Which mineral is an important component of haemoglobin?
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Correct Answer: B. Iron
Iron is a key component of haemoglobin, the protein in red blood cells that carries oxygen.
Iron is a key component of haemoglobin, the protein in red blood cells that carries oxygen.
5. Which gland in the human body produces thyroxine?
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Correct Answer: A. Thyroid gland
The thyroid gland produces thyroid hormones such as thyroxine, which help regulate metabolism and other body processes.
The thyroid gland produces thyroid hormones such as thyroxine, which help regulate metabolism and other body processes.
6. Which chemical element has the symbol Ag?
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Correct Answer: B. Silver
Ag is the chemical symbol for silver and is derived from its Latin name, "argentum."
Ag is the chemical symbol for silver and is derived from its Latin name, "argentum."
7. Which substance is commonly used to neutralize excessive acidity in the stomach?
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Correct Answer: A. Antacid
Antacids contain alkaline substances that can neutralize some of the excess acid in the stomach.
Antacids contain alkaline substances that can neutralize some of the excess acid in the stomach.
8. Which gas is commonly used in fire extinguishers because it does not support combustion?
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Correct Answer: B. Carbon dioxide
Carbon dioxide does not support ordinary combustion and can help displace oxygen around a fire.
Carbon dioxide does not support ordinary combustion and can help displace oxygen around a fire.
9. What is the main purpose of a catalyst in a chemical reaction?
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Correct Answer: C. To speed up a reaction without being permanently consumed
A catalyst provides an alternative reaction pathway with lower activation energy and is not permanently consumed in the overall reaction.
A catalyst provides an alternative reaction pathway with lower activation energy and is not permanently consumed in the overall reaction.
10. Which type of energy is stored in food?
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Correct Answer: A. Chemical energy
Food stores chemical energy in the bonds of molecules such as carbohydrates, fats and proteins.
Food stores chemical energy in the bonds of molecules such as carbohydrates, fats and proteins.
11. What is the SI unit of power?
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Correct Answer: C. Watt
The watt (W) is the SI derived unit of power, which measures the rate at which energy is transferred or work is done.
The watt (W) is the SI derived unit of power, which measures the rate at which energy is transferred or work is done.
12. Which property of an object determines how difficult it is to change its motion?
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Correct Answer: A. Mass
Mass is a measure of an object's inertia, meaning its resistance to changes in its state of motion.
Mass is a measure of an object's inertia, meaning its resistance to changes in its state of motion.
13. Which device is designed to convert mechanical energy into electrical energy?
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Correct Answer: B. Generator
An electrical generator converts mechanical energy into electrical energy, usually through electromagnetic induction.
An electrical generator converts mechanical energy into electrical energy, usually through electromagnetic induction.
14. Which type of mirror is commonly used as a rear-view mirror in vehicles?
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Correct Answer: C. Convex mirror
A convex mirror provides a wider field of view, allowing the driver to see a larger area behind the vehicle.
A convex mirror provides a wider field of view, allowing the driver to see a larger area behind the vehicle.
15. Which process forms sedimentary rocks from layers of deposited material?
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Correct Answer: A. Deposition followed by compaction and cementation
Sedimentary rocks commonly form when sediments accumulate, become compacted and are cemented together over time.
Sedimentary rocks commonly form when sediments accumulate, become compacted and are cemented together over time.
16. Which instrument is used to determine the direction from which wind is blowing?
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Correct Answer: A. Wind vane
A wind vane indicates the direction from which the wind is blowing.
A wind vane indicates the direction from which the wind is blowing.
17. Which planet is the hottest planet in the Solar System on average?
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Correct Answer: B. Venus
Venus has an extremely dense carbon dioxide atmosphere that produces a powerful greenhouse effect, making it the hottest planet on average.
Venus has an extremely dense carbon dioxide atmosphere that produces a powerful greenhouse effect, making it the hottest planet on average.
18. What is the name of the galaxy that contains our Solar System?
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Correct Answer: C. Milky Way Galaxy
Our Solar System is located in the Milky Way, a large barred spiral galaxy containing billions of stars.
Our Solar System is located in the Milky Way, a large barred spiral galaxy containing billions of stars.
19. Which process do green plants use to convert light energy into chemical energy?
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Correct Answer: B. Photosynthesis
During photosynthesis, plants use light energy to build energy-rich organic compounds from carbon dioxide and water.
During photosynthesis, plants use light energy to build energy-rich organic compounds from carbon dioxide and water.
20. Which environmental process naturally removes carbon dioxide from the atmosphere through the growth of plants?
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Correct Answer: A. Photosynthesis
Plants take in carbon dioxide during photosynthesis and incorporate its carbon into organic compounds as they grow.
Plants take in carbon dioxide during photosynthesis and incorporate its carbon into organic compounds as they grow.
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