A ship floats because its density is MCQ with Answer and Explanation

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A ship floats because its density is

A. Equal to water

B. Zero

C. Less than water on average

D. Greater than water

Answer: Option C

Solution (By JKSSB Mock Tests)

Ship is made of steel (density > water) but hollow shape makes average density (including air) less than water. Displaced water weight equals ship's weight, buoyancy holds it up.

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Practice More Physics Questions

Question #1

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

A. 10^18

B. 10^12

C. 10^9

D. 10^15

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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.

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Question #2

The device used for detecting and measuring small electric current is

A. Wattmeter

B. Ammeter

C. Galvanometer

D. Voltmeter

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Correct Answer: Option C

Explanation:
Galvanometer is sensitive instrument for detecting presence and direction of small currents. Ammeter measures larger currents. Voltmeter potential difference. Wattmeter power.

This question belongs to: Science Physics

Question #3

The unit of impulse is

A. N/m

B. N s

C. N m

D. J s

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Correct Answer: Option B

Explanation:
Impulse = F×Δt, unit N s, same as momentum kg m/s.

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