Q. Which of the following statements is true about the nucleus of an atom? (2019)
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A.
It contains only protons
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B.
It contains only neutrons
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C.
It contains protons and neutrons
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D.
It contains electrons
Solution
The nucleus of an atom contains protons and neutrons, which are collectively known as nucleons.
Correct Answer: C — It contains protons and neutrons
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Q. Which of the following statements is true regarding gravitational fields? (2022)
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A.
Gravitational fields are always attractive
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B.
Gravitational fields can be repulsive
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C.
Gravitational fields are independent of mass
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D.
Gravitational fields do not exist in space
Solution
Gravitational fields are always attractive, pulling masses towards each other.
Correct Answer: A — Gravitational fields are always attractive
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Q. Which of the following statements is true regarding the uncertainty principle? (2023)
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A.
It applies only to macroscopic objects
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B.
It states that position and momentum cannot be known simultaneously
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C.
It is only applicable in classical mechanics
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D.
It has no practical implications
Solution
The uncertainty principle states that position and momentum cannot be precisely known at the same time.
Correct Answer: B — It states that position and momentum cannot be known simultaneously
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Q. Which of the following statements is true regarding thermal conductivity? (2023)
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A.
It is higher in gases than in solids
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B.
It is a measure of a material's ability to conduct heat
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C.
It increases with temperature
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D.
It is independent of material properties
Solution
Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material and temperature.
Correct Answer: B — It is a measure of a material's ability to conduct heat
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