Momentum is conserved in MCQ with Answer and Explanation

Question Report Error

Momentum is conserved in

A. No collisions

B. All collisions

C. Only inelastic collisions

D. Only elastic collisions

Answer: Option B

Solution (By JKExamLibrary)

Momentum conserved in all collisions if no external force. KE conserved only in elastic.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A wire of resistance 10 Ω is stretched to double its length. Its new resistance is

A. 20 Ω

B. 40 Ω

C. 5 Ω

D. 10 Ω

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Correct Answer: Option B

Explanation:
Resistance R = ρL/A. Volume constant: A ∝ 1/L. Stretching length to 2L reduces area to A/2. New R' = ρ(2L)/(A/2) = 4ρL/A = 4R = 40 Ω. Resistance proportional to (length)² when volume constant.

This question belongs to: Science Physics

Question #2 Report Error

The voltage of domestic AC supply in India is

A. 110 V, 60 Hz

B. 230 V, 50 Hz

C. 240 V, 60 Hz

D. 220 V, 50 Hz

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Correct Answer: Option B

Explanation:
Standard in India: 230 V, 50 Hz (often 220-240).

This question belongs to: Science Physics

Question #3 Report Error

Sound waves of frequency 20 kHz are called

A. Ultrasonic

B. Supersonic

C. Audible

D. Infrasonic

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Correct Answer: Option A

Explanation:
Above 20 kHz is ultrasonic.

This question belongs to: Science Physics

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