Which of the following uses the principle of electromagnetic induction? MCQ with Answer and Explanation

Which of the following uses the principle of electromagnetic induction?

A. Electric heater

B. Transformer

C. Fuse

D. Incandescent bulb

Answer: Option B

Solution (By JKExamLibrary)

Transformer, induction cooker, generator use induction. Heater and bulb use heating effect of current. Fuse melts by heat. Induction: changing magnetic field induces current.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

What is the mathematical relationship between the escape velocity (Ve) and the orbital velocity (Vo) of a satellite revolving very close to the surface of the Earth?

A. Ve = 2 * Vo

B. Ve = sqrt(2) * Vo

C. Vo = sqrt(2) * Ve

D. Ve = Vo

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
The orbital velocity of a satellite very close to Earth is Vo = sqrt(gR). The escape velocity from Earth's surface is Ve = sqrt(2gR). Therefore, substituting Vo into the escape velocity equation yields Ve = sqrt(2) * Vo. A satellite requires a 41.4% increase in speed to escape orbit completely.

This question belongs to: Science Physics

Question #2 Report Error

A car travels first half distance at 40 km/h and second half at 60 km/h. Average speed is

A. 45 km/h

B. 52 km/h

C. 48 km/h

D. 50 km/h

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Average speed = 2v₁v₂/(v₁+v₂) = 2×40×60/(40+60) = 4800/100 = 48 km/h. Not arithmetic mean (50). For equal distances, harmonic mean of speeds. If times equal, arithmetic mean applies.

This question belongs to: Science Physics