The magnifying power of a simple microscope is maximum when the image is formed at MCQ with Answer and Explanation

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The magnifying power of a simple microscope is maximum when the image is formed at

A. Near point

B. Focus

C. 2F

D. Infinity

Answer: Option A

Solution (By JKSSB Mock Tests)

M = 1 + D/f when image at near point (D = 25 cm). For infinity, M = D/f. So max at near point.

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Question #1

The device used for detecting and measuring small electric current is

A. Wattmeter

B. Galvanometer

C. Voltmeter

D. Ammeter

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Correct Answer: Option B

Explanation:
Galvanometer is sensitive instrument for detecting presence and direction of small currents. Ammeter measures larger currents. Voltmeter potential difference. Wattmeter power.

This question belongs to: Science Physics

Question #2

Ultrasonic waves have frequency

A. Greater than 20 kHz

B. 20 Hz to 20 kHz

C. Less than 20 Hz

D. Greater than 20 MHz

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Correct Answer: Option A

Explanation:
Above 20 kHz is ultrasound.

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Question #3

Transistor current gain β = I_C/I_B. Typical value range:

A. 20-200

B. 1-10

C. 0.1-1

D. 1000-5000

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Correct Answer: Option A

Explanation:
BJT common-emitter current gain β typically 20-200. Small base current controls larger collector current. Memory aid: 'β = collector/base current ratio; value 20-200 for standard transistors'. Electronics parameter frequently tested in competitive exams.

This question belongs to: Science Physics

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