The rate of change of displacement is MCQ with Answer and Explanation

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The rate of change of displacement is

A. Speed

B. Momentum

C. Acceleration

D. Velocity

Answer: Option D

Solution (By JKSSB Mock Tests)

Velocity = d(displacement)/dt. Speed is rate of change of distance.

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Question #1

A body of volume 100 cc weighs 80 g in air. It will float in water with

A. It will sink

B. 80 cc submerged

C. 20 cc above water

D. 100 cc submerged

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Correct Answer: Option B

Explanation:
Density = 80/100 = 0.8 g/cc. Water density 1 g/cc. Fraction submerged = 0.8, so 80 cc submerged, 20 cc above. So option B correct.

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Question #2

Free fall: height h takes time t. Height 4h takes time:

A. t

B. 2t

C. t/2

D. 4t

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Correct Answer: Option B

Explanation:
h = ½gt² ⇒ t ∝ √h. If h' = 4h, t' = √4 × t = 2t. Time doubles when height quadruples. Memory aid: 'Free fall: t ∝ √h; 4× height ⇒ 2× time'. Kinematics proportionality frequently tested in competitive exams.

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Question #3

The prefix 'pico' represents

A. 10⁻⁶

B. 10⁻¹⁵

C. 10⁻⁹

D. 10⁻¹²

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Correct Answer: Option D

Explanation:
pico = 10⁻¹². Femto = 10⁻¹⁵.

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