MCQ Collection
China MCQs
Practice China questions with answers and explanations.
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Correct Answer: C. A convex lens can converge parallel rays to a real focus
Explanation:
A convex lens is converging and brings parallel incident rays toward its principal focus.
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Correct Answer: C. The half-life is the time for the number of undecayed nuclei to fall to half its initial value
Explanation:
Half-life is a characteristic decay time at which the undecayed population becomes one half.
Correct Answer: 13.75
Explanation:
Speed=distance/time=220/16=13.75 m/s.
Correct Answer: 56
Explanation:
Newton’s second law gives F=ma=8×7=56 N.
Correct Answer: 64
Explanation:
K=½mv²=½×2×8²=64.0 J.
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Correct Answer: C. It is perpendicular to the direction of wave propagation
Explanation:
A transverse wave oscillates perpendicular to the direction in which the wave travels.
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Correct Answer: C. The electric field points in the direction a positive test charge would accelerate
Explanation:
Electric-field direction is defined by the force direction on a positive test charge.
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Correct Answer: B. A convex lens can converge parallel rays to a real focus
Explanation:
A convex lens is converging and brings parallel incident rays toward its principal focus.
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Correct Answer: A. The half-life is the time for the number of undecayed nuclei to fall to half its initial value
Explanation:
Half-life is a characteristic decay time at which the undecayed population becomes one half.
Correct Answer: 13.33
Explanation:
Speed=distance/time=200/15=13.33 m/s.
Correct Answer: 42
Explanation:
Newton’s second law gives F=ma=7×6=42 N.
Correct Answer: 171.5
Explanation:
K=½mv²=½×7×7²=171.5 J.
