The phenomenon of electromagnetic induction is the basis for the working of: MCQ with Answer and Explanation

The phenomenon of electromagnetic induction is the basis for the working of:
A. Electric motor
B. Transformer
C. Generator
D. Both (b) and (c)
Answer: Option D
Solution (By JKSSB Mock Tests)
Electromagnetic induction (changing magnetic flux induces EMF) is the principle behind generators (mechanical energy to electrical) and transformers (AC voltage conversion). Electric motors work on the reverse principle: force on current-carrying conductor in magnetic field. Memory aid: 'Induction applications: generators, transformers, induction cooktops; motors use motor effect'. This application question tests electromagnetism fundamentals, frequently examined in competitive exams. Always distinguish induction (generator/transformer) from motor effect (motor); competitive exams often combine both in device-based questions.

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Which is the most penetrating radiation?
A. Beta
B. X-rays
C. Alpha
D. Gamma

Correct Answer: Option D


Explanation:
Gamma rays highest penetration, alpha least.

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Question #2
Myopia correction uses:
A. Convex lens
B. Concave lens
C. Bifocal lens
D. Cylindrical lens

Correct Answer: Option B


Explanation:
Myopia (nearsightedness): far point reduced; corrected by concave (diverging) lens to shift image to retina. Hypermetropia uses convex lens. Memory tip: 'Myopia = near-sighted ⇒ concave lens; Hyper = far-sighted ⇒ convex'. Vision defect correction frequently tested in competitive exams to assess application knowledge.

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Question #3
The frequency of a sound wave is 500 Hz and wavelength 0.68 m. Speed is
A. 34 m/s
B. 340 m/s
C. 680 m/s
D. 170 m/s

Correct Answer: Option B


Explanation:
v = f λ = 500 × 0.68 = 340 m/s, typical speed of sound in air.

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