A bullet of mass 20 g fired from a gun of mass 5 kg with velocity 200 m/s. Recoil velocity of gun is MCQ with Answer and Explanation

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A bullet of mass 20 g fired from a gun of mass 5 kg with velocity 200 m/s. Recoil velocity of gun is

A. 2 m/s

B. 1 m/s

C. 0.4 m/s

D. 0.8 m/s

Answer: Option D

Solution (By JKExamLibrary)

Conservation of momentum: 0 = (0.02×200) + (5×v) => v = -4/5 = -0.8 m/s (magnitude 0.8 m/s).

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The loudness of sound is measured in

A. Decibel

B. Meter

C. Watt

D. Hertz

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Correct Answer: Option A

Explanation:
Decibel (dB) measures intensity level.

This question belongs to: Science Physics

Question #2

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

A. 80 cc submerged

B. 20 cc above water

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D. It will sink

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Correct Answer: Option A

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.

This question belongs to: Science Physics

Question #3

The prefix 'Peta' in the SI system represents which power of 10?

A. 10^12

B. 10^9

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Correct Answer: Option D

Explanation:
In the SI system of prefixes, 'Peta' stands for 10^15. Other common large prefixes include Kilo (10^3), Mega (10^6), Giga (10^9), Tera (10^12), and Exa (10^18). It's crucial to memorize both positive and negative powers (like nano, pico, femto) for competitive exams.

This question belongs to: Science Physics

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