The device which converts mechanical energy into electrical energy is MCQ with Answer and Explanation

The device which converts mechanical energy into electrical energy is
A. Motor
B. Generator
C. Rectifier
D. Transformer
Answer: Option B
Solution (By JKSSB Mock Tests)
Generator uses electromagnetic induction to produce electricity from mechanical motion.

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Practice More Physics Questions

Question #1
Ultrasonic waves have frequency
A. Less than 20 Hz
B. 20 Hz to 20 kHz
C. Greater than 20 MHz
D. Greater than 20 kHz

Correct Answer: Option D


Explanation:
Above 20 kHz is ultrasound.

This question belongs to: Science Physics
Question #2
In a p-n junction diode, the depletion region is created primarily due to:
A. Heating of the semiconductor material.
B. Drift of electrons under a strong electric field.
C. Diffusion of majority charge carriers across the junction.
D. Recombination of minority carriers.

Correct Answer: Option C


Explanation:
When a p-type and an n-type semiconductor are joined, electrons from the n-side (majority carriers) diffuse across the junction to the p-side, and holes from the p-side diffuse to the n-side due to concentration gradients. They recombine near the junction, leaving behind immobile ionized atoms (positive donor ions on n-side, negative acceptor ions on p-side). This uncovered charge region is the depletion layer.

This question belongs to: Science Physics
Question #3
A transformer has 400 primary turns and 100 secondary turns. If primary voltage is 220 V, secondary voltage is
A. 55 V
B. 440 V
C. 880 V
D. 110 V

Correct Answer: Option A


Explanation:
Vs/Vp = Ns/Np => Vs = 220 × (100/400) = 55 V. Step-down.

This question belongs to: Science Physics