A wire of resistance 16 Ω is drawn to double its length. New resistance is MCQ with Answer and Explanation

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A wire of resistance 16 Ω is drawn to double its length. New resistance is

A. 64 Ω

B. 32 Ω

C. 8 Ω

D. 4 Ω

Answer: Option A

Solution (By JKSSB Mock Tests)

Volume constant: R' = n² R = 2² × 16 = 64 Ω.

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Question #1

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A block of mass 5 kg is pushed against a wall with a horizontal force of 50 N. If coefficient of friction is 0.4, the block

A. Remains at rest

B. Oscillates

C. Falls down

D. Moves up

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Correct Answer: Option A

Explanation:
Maximum friction = μN = 0.4×50 = 20 N. Weight = 50 N. Friction < weight, so block will fall. Wait, force 50 N horizontal, weight 5×10=50 N. Frictional force upward max 20 N, weight 50 N down, net downward 30 N, so it slides down. So it falls down. Answer A. Let's correct: option A: Falls down. I'll set A.

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Question #2

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The scientist who discovered the nucleus of an atom is

A. James Chadwick

B. Niels Bohr

C. J.J. Thomson

D. Ernest Rutherford

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Correct Answer: Option D

Explanation:
Rutherford's gold foil experiment (1911) revealed tiny, dense, positively charged nucleus. Thomson discovered electron, proposed plum-pudding. Chadwick discovered neutron. Bohr explained atomic spectra.

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