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

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A man pushes a wall but fails to move it. He does

A. Maximum work

B. Positive work

C. Zero work

D. Negative work

Answer: Option C

Solution (By JKExamLibrary)

Work = force × displacement in direction of force. Displacement zero, so work zero. Physiology work is done internally, but physics work zero.

This question belongs to: Science Physics

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Alpha particles are

A. Electromagnetic waves

B. Protons

C. Helium nuclei

D. Electrons

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Correct Answer: Option C

Explanation:
Alpha particles are helium nuclei (2 protons, 2 neutrons), charge +2e, mass 4 u. Beta particles are fast electrons (or positrons). Gamma rays are high-energy photons, no mass, no charge.

This question belongs to: Science Physics

Question #2 Report Error

The minimum distance to hear an echo (persistence of hearing 0.1 s, speed 340 m/s) is

A. 17 m

B. 10 m

C. 34 m

D. 68 m

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Correct Answer: Option A

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This question belongs to: Science Physics

Question #3 Report Error

Photon energy E = hν. For higher frequency light, photon energy is:

A. Higher

B. Zero

C. Lower

D. Same

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Correct Answer: Option A

Explanation:
E ∝ ν: higher frequency ⇒ higher photon energy. Gamma rays (high ν) more energetic than radio waves (low ν). Memory aid: 'E = hν; blue light photons more energetic than red'. Quantum physics relation frequently tested in competitive exams.

This question belongs to: Science Physics

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