A piece of copper wire has resistance 10 Ω at 0°C. α = 0.004/°C. At 100°C resistance is MCQ with Answer and Explanation

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A piece of copper wire has resistance 10 Ω at 0°C. α = 0.004/°C. At 100°C resistance is

A. 10 Ω

B. 12 Ω

C. 14 Ω

D. 8 Ω

Answer: Option C

Solution (By JKSSB Mock Tests)

R_t = R₀(1+α t) = 10(1+0.004×100) = 10(1.4) = 14 Ω.

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Question #1

Potentiometer sensitivity increased by:

A. Higher current

B. Shorter wire

C. Thicker wire

D. Longer wire

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Correct Answer: Option D

Explanation:
Longer wire ⇒ smaller potential gradient (V/cm) ⇒ finer voltage measurement ⇒ higher sensitivity. Memory tip: 'Sensitivity ∝ wire length; smaller gradient = better resolution'. Experimental physics concept frequently tested in competitive exams.

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Question #2

The instrument used to measure intensity of earthquakes is

A. Hygrometer

B. Seismograph

C. Richter scale

D. Barometer

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Correct Answer: Option B

Explanation:
Seismograph records seismic waves. Richter scale quantifies magnitude.

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Question #3

A cell of emf 2 V and internal resistance 0.5 Ω is connected to a 3.5 Ω resistor. Terminal voltage is

A. 2 V

B. 0.25 V

C. 1.5 V

D. 1.75 V

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Correct Answer: Option D

Explanation:
I = E/(R+r) = 2/(3.5+0.5) = 2/4 = 0.5 A. Terminal V = IR = 0.5×3.5 = 1.75 V. Or E - Ir = 2 - 0.5×0.5 = 1.75 V.

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