MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: A. 5.196 s
Explanation:
Time of flight is T = 2u sinθ/g.
Substitution gives the stated value.
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Correct Answer: B. Activation energy decreases
Explanation:
Reaction rate depends on effective collision frequency and activation energy.
The stated change follows from collision theory.
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Correct Answer: B. 33.75 m
Explanation:
Maximum height is H = u²sin²θ/(2g).
Substitution gives the stated value.
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Correct Answer: C. A larger fraction of molecules exceeds activation energy
Explanation:
Reaction rate depends on effective collision frequency and activation energy.
The stated change follows from collision theory.
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Correct Answer: C. 77.94 m
Explanation:
Range is R = u²sin2θ/g for equal launch and landing heights.
Substitution gives the stated value.
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Correct Answer: D. Available surface area increases
Explanation:
Reaction rate depends on effective collision frequency and activation energy.
The stated change follows from collision theory.
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Correct Answer: D. 2 m/s
Explanation:
Total momentum before equals total momentum after.
For sticking bodies, v = (m₁u₁+m₂u₂)/(m₁+m₂).
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Correct Answer: A. Collision frequency generally increases
Explanation:
Reaction rate depends on effective collision frequency and activation energy.
The stated change follows from collision theory.
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Correct Answer: B. The number of effective catalytic sites decreases
Explanation:
Reaction rate depends on effective collision frequency and activation energy.
The stated change follows from collision theory.
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Correct Answer: C. 40 m
Explanation:
Range is R = u²sin2θ/g for equal launch and landing heights.
Substitution gives the stated value.
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Correct Answer: D. 3.464 s
Explanation:
Time of flight is T = 2u sinθ/g.
Substitution gives the stated value.
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Correct Answer: A. 0.02 mol L⁻¹ s⁻¹
Explanation:
Average disappearance rate = decrease in concentration divided by time.
The positive magnitude is used for a reactant-disappearance rate.
