MCQ Collection
China MCQs
Practice China questions with answers and explanations.
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Correct Answer: C. The total momentum of an isolated system remains constant
Explanation:
In an isolated system, internal forces occur in equal and opposite pairs, so total momentum is constant.
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Correct Answer: D. 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: B. 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: 11.67
Explanation:
Speed=distance/time=140/12=11.67 m/s.
Correct Answer: 12
Explanation:
Newton’s second law gives F=ma=4×3=12 N.
Correct Answer: 32
Explanation:
K=½mv²=½×4×4²=32.0 J.
Correct Answer: 2
Explanation:
Ohm’s law gives I=V/R=8/4=2.000 A.
Correct Answer: 12
Explanation:
Wave speed v=fλ=4×3=12 m/s.
Correct Answer: 6
Explanation:
Newton’s second law gives F=ma=3×2=6 N.
Correct Answer: 13.5
Explanation:
K=½mv²=½×3×3²=13.5 J.
Correct Answer: 2.333
Explanation:
Ohm’s law gives I=V/R=7/3=2.333 A.
Correct Answer: 6
Explanation:
Wave speed v=fλ=3×2=6 m/s.
