A man pushes a wall but fails to move it. He does MCQ with Answer and Explanation

A man pushes a wall but fails to move it. He does
A. Maximum work
B. Zero work
C. Positive work
D. Negative work
Answer: Option B
Solution (By JKSSB Mock Tests)
Work = force × displacement in direction of force. Displacement zero, so work zero. Physiology work is done internally, but physics work zero.

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Practice More Physics Questions

Question #1
A transformer with 100 primary turns and 500 secondary turns is a
A. Auto transformer
B. Step-down transformer
C. Isolation transformer
D. Step-up transformer

Correct Answer: Option D


Explanation:
Ns > Np => step-up. Vs > Vp.

This question belongs to: Science Physics
Question #2
When a wave travels from one medium to another, which of its properties never changes?
A. Wavelength
B. Amplitude
C. Velocity
D. Frequency

Correct Answer: Option D


Explanation:
When a wave (like light or sound) changes mediums, its velocity changes due to the new medium's optical or mechanical density. Wavelength changes proportionally with velocity (v = fλ). However, frequency is determined solely by the source generating the wave and the energy of the photons/particles, and it remains absolutely constant.

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Question #3
The work done in moving a body along a closed path in a conservative force field is
A. Minimum
B. Zero
C. Depends on path
D. Maximum

Correct Answer: Option B


Explanation:
Conservative forces (gravitational, electrostatic) have zero net work around closed path. Friction is non-conservative.

This question belongs to: Science Physics