MCQ Collection
China MCQs
Practice China questions with answers and explanations.
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Correct Answer: B. 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: 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: A. 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.
Correct Answer: 28.57
Explanation:
Percentage=(10/35)×100=28.57.
Correct Answer: 10.91
Explanation:
Speed=distance/time=120/11=10.91 m/s.
Correct Answer: 55
Explanation:
An antiderivative is 4/2 x²+1x. At x=5, the value is 55.0.
Correct Answer: 16
Explanation:
The dot product is 4×2+2×4=16.
Correct Answer: 5
Explanation:
Rewrite the value using base 5: 3125 = 5^5. Matching exponents gives x = 5.
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Correct Answer: A. 81π
Explanation:
Use the circle-area formula A = πr². Substituting r = 9 gives A = π × 9² = 81π.
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Correct Answer: B. 64π
Explanation:
Use the circle-area formula A = πr². Substituting r = 8 gives A = π × 8² = 64π.
Correct Answer: 26.47
Explanation:
Percentage=(9/34)×100=26.47.
Correct Answer: 5
Explanation:
Subtract 9 from both sides and divide by 3: x = (24-9)/3 = 5.
