Which of the following is a good insulator? MCQ with Answer and Explanation

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Which of the following is a good insulator?

A. Rubber

B. Graphite

C. Silver

D. Copper

Answer: Option A

Solution (By JKSSB Mock Tests)

Rubber has no free electrons, high resistivity. Silver best conductor. Copper widely used conductor. Graphite conducts (non-metal). Insulators: glass, plastic, wood.

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Practice More Physics Questions

Question #1

The temperature of a body is 86°F. What is it in Celsius?

A. 20°C

B. 40°C

C. 25°C

D. 30°C

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Correct Answer: Option D

Explanation:
C = (F-32) × 5/9 = (86-32)×5/9 = 54×5/9 = 30°C. Common conversion. 86°F warm day. 32°F = 0°C.

This question belongs to: Science Physics

Question #2

Uniform acceleration: v-t graph is:

A. Hyperbola

B. Straight line with slope

C. Horizontal line

D. Parabola

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Correct Answer: Option B

Explanation:
a = constant ⇒ v = u + at (linear in t). Slope = acceleration. Memory tip: 'v-t slope = acceleration; area = displacement'. Graph interpretation frequently tested in competitive kinematics sections.

This question belongs to: Science Physics

Question #3

If X = a²b³/c², and percentage errors in a, b, c are 2% each, the maximum percentage error in X is

A. 14%

B. 10%

C. 12%

D. 8%

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Correct Answer: Option A

Explanation:
ΔX/X = 2(Δa/a) + 3(Δb/b) + 2(Δc/c) = 2×2% + 3×2% + 2×2% = 4% + 6% + 4% = 14%. Always add absolute relative errors.

This question belongs to: Science Physics

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