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. Transformer
B. Electric bulb
C. Electric motor
D. Resistor
Answer: Option A
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
Two bodies of masses m and 2m are dropped from a height. Neglecting air resistance, which hits first?
A. Depends on height
B. 2m
C. Both same
D. m
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Correct Answer: Option C

Explanation:
Acceleration g same for all masses in vacuum.
This question belongs to: Science Physics
Question #2
A 5 kg object is moving with 2 m/s. Its momentum is
A. 0.4 kg m/s
B. 2.5 kg m/s
C. 7 kg m/s
D. 10 kg m/s
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Correct Answer: Option D

Explanation:
p = m v = 5 × 2 = 10 kg m/s. Direction same as velocity. Momentum vector. Unit kg·m/s.
This question belongs to: Science Physics
Question #3
A conductor has resistance 4 Ω at 0°C and temperature coefficient α. At what temperature will resistance be 6 Ω? (α=0.004 /°C)
A. 125°C
B. 100°C
C. 75°C
D. 150°C
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Correct Answer: Option A

Explanation:
R_t = R₀(1+α t). 6 = 4(1+0.004 t) => 1.5 = 1+0.004t => 0.5=0.004t => t=125°C.
This question belongs to: Science Physics
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