The time period of a seconds pendulum is MCQ with Answer and Explanation

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The time period of a seconds pendulum is

A. 4 s

B. 2 s

C. 1 s

D. 0.5 s

Answer: Option B

Solution (By JKSSB Mock Tests)

Seconds pendulum has period 2 s (1 s each swing).

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Question #1

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A simple pendulum of length L has period T. If length is increased by 4 times, new period is

A. T/4

B. 2T

C. 4T

D. T/2

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Correct Answer: Option B

Explanation:
T ∝ √L, so √4 = 2 times.

This question belongs to: Science Physics

Question #2

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A bimetallic strip is made of brass and invar. On heating, it bends with brass on

A. Outer side

B. Depends on thickness

C. Inner side

D. No bending

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Correct Answer: Option A

Explanation:
Brass expands more than invar. So it becomes longer, forcing strip to bend with brass on convex (outer) side.

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Question #3

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A body weighs 100 N on Earth's surface. Weight at a height equal to Earth's radius is

A. 0 N

B. 100 N

C. 50 N

D. 25 N

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Correct Answer: Option D

Explanation:
g' = g (R/(R+h))² = g (1/2)² = g/4. Weight = 100/4 = 25 N.

This question belongs to: Science Physics

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