A conductor has resistance 4 Ω at 0°C and temperature coefficient α. At what temperature will resistance be 6 Ω? (α=0.004 /°C) MCQ with Answer and Explanation

Question

A conductor has resistance 4 Ω at 0°C and temperature coefficient α. At what temperature will resistance be 6 Ω? (α=0.004 /°C)

A. 125°C

B. 75°C

C. 100°C

D. 150°C

Answer: Option A

Solution (By JKSSB Mock Tests)

R_t = R₀(1+α t). 6 = 4(1+0.004 t) => 1.5 = 1+0.004t => 0.5=0.004t => t=125°C.

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Raindrops fall to the ground with a uniform, constant velocity. This constant velocity is achieved when the gravitational pull is perfectly balanced by:

A. Viscous drag force alone

B. Buoyant force alone

C. The sum of viscous drag force and buoyant force

D. Surface tension of the drop

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Correct Answer: Option C

Explanation:
As a raindrop falls, it accelerates due to gravity. The upward viscous drag force of the air increases with the drop's velocity (Stokes' Law). Eventually, the downward weight of the drop is exactly balanced by the upward buoyant force of the air plus the upward viscous drag force. The net force becomes zero, and it falls with a constant 'terminal velocity'.

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