A stone tied to a string is whirled in a circle. The work done by tension in string is MCQ with Answer and Explanation

Question

Share Report Error

A stone tied to a string is whirled in a circle. The work done by tension in string is

A. Zero

B. Negative

C. Positive

D. Variable

Answer: Option A

Solution (By JKSSB Mock Tests)

Tension is towards centre, displacement is tangential (velocity). Force perpendicular to displacement, cos90°=0, work zero. Centripetal force does no work, doesn't change speed.

This question belongs to: Science Physics

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1

Share Report

A body is thrown vertically upwards with kinetic energy 100 J. At highest point, kinetic energy is

A. 100 J

B. 50 J

C. 200 J

D. 0 J

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
At highest point velocity zero, so K.E. = 0. All converted to P.E.

This question belongs to: Science Physics

Question #2

Share Report

The temperature of boiling water in Fahrenheit scale is

A. 212°F

B. 180°F

C. 32°F

D. 100°F

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Boiling point 100°C = (9/5×100)+32 = 180+32 = 212°F. Freezing 0°C = 32°F. Body temp 98.4°F ≈ 37°C. Scale conversion.

This question belongs to: Science Physics

Question #3

Share Report

The working of an optical fibre is based on

A. Total internal reflection

B. Diffraction

C. Dispersion

D. Refraction

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Light signal travels by repeated total internal reflection.

This question belongs to: Science Physics

Explore All Physics MCQs