Everyday Science MCQs (page 4 of 51)
Physics, chemistry, biology, the human body, units and the solar system, covering the everyday science section of general-ability tests.
1,014 questions. Select an option to check your answer, or open "Show answer". Showing 61–80.
- 61.
Which blood group is known as the universal donor?
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Answer: B. O negative
O negative red cells can usually be given to patients of any blood group in emergencies.
- 62.
Insulin is produced by the:
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Answer: D. Pancreas
Beta cells in the pancreas produce insulin, which controls blood sugar.
- 63.
Which is the largest organ of the human body?
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Answer: B. Skin
The skin is the largest organ. The liver is the largest internal organ.
- 64.
How many bones are there in an adult human body?
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Answer: B. 206
A newborn has about 300 bones, many of which fuse with age.
- 65.
Which is the smallest bone in the human body?
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Answer: B. Stapes
The stapes in the middle ear is about 3 mm long. The femur is the largest bone.
- 66.
Which gas do green plants absorb during photosynthesis?
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Answer: A. Carbon dioxide
Plants use carbon dioxide and water, with energy from sunlight, to make glucose and release oxygen.
- 67.
The ozone layer protects the Earth from:
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Answer: D. Ultraviolet radiation
Ozone in the stratosphere absorbs most of the Sun's harmful ultraviolet rays.
- 68.
What is the pH of pure water at 25°C?
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Answer: C. 7
Pure water is neutral. Values below 7 are acidic and above 7 are basic.
- 69.
Ohm's law states that voltage equals:
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Answer: D. Current × resistance
V = I × R.
- 70.
Which planet is known for its prominent ring system?
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Answer: A. Saturn
Saturn's rings are made mostly of ice particles.
- 71.
What is the chemical symbol of hydrogen?
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Answer: D. H
The symbol of hydrogen is H.
- 72.
Which element has the chemical symbol H?
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Answer: B. Hydrogen
H is the symbol of hydrogen.
- 73.
What is the atomic number of hydrogen?
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Answer: A. 1
Hydrogen has 1 proton, so its atomic number is 1.
- 74.
Which element has the atomic number 1?
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Answer: C. Hydrogen
Atomic number 1 belongs to hydrogen (H).
- 75.
What is the chemical symbol of helium?
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Answer: A. He
The symbol of helium is He.
- 76.
Which element has the chemical symbol He?
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Answer: C. Helium
He is the symbol of helium.
- 77.
What is the atomic number of helium?
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Answer: B. 2
Helium has 2 protons, so its atomic number is 2.
- 78.
Which element has the atomic number 2?
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Answer: D. Helium
Atomic number 2 belongs to helium (He).
- 79.
What is the chemical symbol of lithium?
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Answer: C. Li
The symbol of lithium is Li.
- 80.
Which element has the chemical symbol Li?
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Answer: B. Lithium
Li is the symbol of lithium.