A body starts from rest and moves with uniform acceleration. The ratio of distances covered in 1st, 2nd, and 3rd seconds is MCQ with Answer and Explanation

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A body starts from rest and moves with uniform acceleration. The ratio of distances covered in 1st, 2nd, and 3rd seconds is

A. 1:3:5

B. 1:2:3

C. 1:1:1

D. 1:4:9

Answer: Option A

Solution (By JKExamLibrary)

s_nth = u + a/2 (2n-1). u=0, so distances proportional to (2n-1): 1,3,5.

This question belongs to: Science Physics

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Question #1 Report Error

Gravitational constant G dimensions:

A. [M⁰L⁰T⁰]

B. [ML³T⁻²]

C. [M⁻¹L²T⁻²]

D. [M⁻¹L³T⁻²]

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Correct Answer: Option D

Explanation:
F = Gm₁m₂/r² ⇒ G = Fr²/(m₁m₂) = [MLT⁻²][L²]/[M²] = [M⁻¹L³T⁻²]. Memory aid: 'G dimensions: [M⁻¹L³T⁻²]; small value reflects weak gravity'. Dimensional analysis frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2 Report Error

The rate of change of momentum is equal to

A. Force

B. Power

C. Impulse

D. Work

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Correct Answer: Option A

Explanation:
F = dp/dt (Newton's second law original form). Impulse is Δp. Work F·s. Power dW/dt.

This question belongs to: Science Physics

Question #3 Report Error

The phenomenon of bouncing back of light from a surface is called

A. Refraction

B. Reflection

C. Dispersion

D. Diffraction

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Correct Answer: Option B

Explanation:
Reflection: light returns into same medium. Laws: angle i = angle r. Refraction is bending into another medium. Dispersion splitting colours. Diffraction spreading around obstacles.

This question belongs to: Science Physics

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