Which of the following is a non-contact force? MCQ with Answer and Explanation

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Which of the following is a non-contact force?

A. Muscular force

B. Friction

C. Normal force

D. Electrostatic force

Answer: Option D

Solution (By JKSSB Mock Tests)

Electrostatic force acts between charges at a distance without contact. Gravity, magnetic force also non-contact. Friction and normal require contact.

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Question #1

Fuse protects circuit by:

A. Melting on overcurrent

B. Amplifying signal

C. Limiting voltage

D. Storing energy

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Correct Answer: Option A

Explanation:
Fuse wire melts when current exceeds rating (Joule heating I²R), breaking circuit to prevent damage. Sacrificial overcurrent protection. Memory aid: 'Fuse = thermal cutoff; rated current slightly above normal'. Safety device function frequently tested in competitive electricity sections.

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Question #2

A ball is thrown upward with velocity 30 m/s. Time to reach maximum height (g=10) is

A. 6 s

B. 3 s

C. 1.5 s

D. 2 s

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Correct Answer: Option B

Explanation:
v = u - gt, at top v=0 => t = u/g = 30/10 = 3 s.

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Question #3

A 10 μF capacitor is charged to 100 V. Energy stored is

A. 0.5 J

B. 0.05 J

C. 5 J

D. 50 J

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Correct Answer: Option B

Explanation:
E = ½CV² = ½ × 10×10⁻⁶ × 10000 = 0.05 J.

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