The device that uses the principle of electromagnetic induction is MCQ with Answer and Explanation

Question
The device that uses the principle of electromagnetic induction is
A. Electric motor
B. Electric bulb
C. Resistor
D. Transformer
Answer: Option D
Solution (By JKSSB Mock Tests)
Transformer, generator, dynamo use electromagnetic induction (Faraday's law). Motor uses magnetic effect of current. Bulb uses heating effect. Resistor limits current. Induction: changing flux induces emf.
This question belongs to: Science Physics
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Practice More Physics Questions

Question #1
The process of coating iron with zinc to prevent rusting is called
A. Galvanisation
B. Alloying
C. Annealing
D. Electroplating
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Correct Answer: Option A

Explanation:
Galvanisation: iron/steel coated with zinc to prevent corrosion. Zinc acts as sacrificial anode. Electroplating deposits metal layer using electricity. Alloying mixing metals. Annealing heat treatment.
This question belongs to: Science Physics
Question #2
A 2 kg object is raised to a height of 5 m. The work done against gravity (g=10) is
A. 100 J
B. 10 J
C. 50 J
D. 0 J
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Correct Answer: Option A

Explanation:
Work = mgh = 2 × 10 × 5 = 100 J. Force = mg = 20 N, distance 5 m, work = 20 × 5 = 100 J. This becomes potential energy stored.
This question belongs to: Science Physics
Question #3
A lactometer is used to check
A. Purity of milk
B. Purity of water
C. Blood pressure
D. Humidity
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Correct Answer: Option A

Explanation:
Measures specific gravity of milk, indicates adulteration.
This question belongs to: Science Physics
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