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

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

A. Outer side

B. No bending

C. Inner side

D. Depends on thickness

Answer: Option A

Solution (By JKExamLibrary)

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

This question belongs to: Science Physics

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In a transistor, the collector current is 1 mA and base current 10 μA. Emitter current is

A. 0.99 mA

B. 1.1 mA

C. 1.01 mA

D. 0.9 mA

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Correct Answer: Option C

Explanation:
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The pitch of a sound becomes higher if

A. Wavelength increases

B. Amplitude increases

C. Frequency increases

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Correct Answer: Option C

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The frequency of AC mains in India is 50 Hz. The time period is

A. 0.5 s

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C. 50 s

D. 0.2 s

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Correct Answer: Option B

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