Bohr radius r_n ∝ MCQ with Answer and Explanation

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Bohr radius r_n ∝

A. 1/n

B. n

C. 1/n²

D. n²

Answer: Option D

Solution (By JKSSB Mock Tests)

Bohr model: r_n = n²a₀ ⇒ r ∝ n². Higher n = larger orbit. Memory tip: 'Bohr: r ∝ n²; E ∝ -1/n²'. Atomic physics relation frequently tested in competitive exams.

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Question #1

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Electric motor works on principle of:

A. Electrostatic attraction

B. Force on current in magnetic field

C. Thermal expansion

D. Electromagnetic induction

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Correct Answer: Option B

Explanation:
Motor: current-carrying conductor in magnetic field experiences Lorentz force (F = ILB), causing rotation. Generator uses reverse principle (induction). Memory tip: 'Motor: electricity ⇒ motion (force); Generator: motion ⇒ electricity (induction)'. Device principle question frequently tested in competitive electromagnetism sections.

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Question #2

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The human ear can hear sound in frequency range

A. 20 Hz - 20 kHz

B. 20 kHz - 200 kHz

C. 0-20 Hz

D. Above 200 kHz

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Correct Answer: Option A

Explanation:
Audible range: 20 Hz to 20,000 Hz (20 kHz). Below 20 Hz infrasound, above ultrasound. This range decreases with age. Dogs can hear higher frequencies (ultrasonic whistles).

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