Q. Which of the following statements is true about the image formed by a convex lens? (2021)
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A.
Always real
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B.
Always virtual
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C.
Can be real or virtual
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D.
Always inverted
Solution
A convex lens can form both real and virtual images depending on the position of the object relative to the focal point.
Correct Answer: C — Can be real or virtual
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Q. Which of the following statements is true about the law of conservation of energy?
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A.
Energy can be created
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B.
Energy can be destroyed
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C.
Energy can be transformed
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D.
Energy is always lost
Solution
The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another.
Correct Answer: C — Energy can be transformed
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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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