The human ear can hear sound in frequency range MCQ with Answer and Explanation

Question Report Error

The human ear can hear sound in frequency range

A. 20 Hz - 20 kHz

B. Above 200 kHz

C. 20 kHz - 200 kHz

D. 0-20 Hz

Answer: Option A

Solution (By JKExamLibrary)

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).

This question belongs to: Science Physics

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Question #1 Report Error

A body of mass 2 kg is raised to height 10 m and dropped. Potential energy just before dropping is (g=10)

A. 20 J

B. 100 J

C. 200 J

D. 0 J

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Correct Answer: Option C

Explanation:
PE = mgh = 2×10×10 = 200 J.

This question belongs to: Science Physics

Question #2 Report Error

Atom's nucleus contains:

A. Protons, neutrons, electrons

B. Only protons

C. Protons and neutrons

D. Electrons and protons

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Correct Answer: Option C

Explanation:
Nucleus: protons (+) and neutrons (neutral); electrons orbit outside. Atomic number = proton count; mass number = protons + neutrons. Memory tip: 'Nucleus = nucleons (p+n); electrons in shells'. Basic atomic structure frequently tested in competitive modern physics sections.

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Question #3 Report Error

In a nuclear reactor, the function of a moderator is to

A. Remove heat

B. Absorb neutrons

C. Slow down neutrons

D. Control chain reaction

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Correct Answer: Option C

Explanation:
Moderator slows fast neutrons to thermal energies to increase probability of fission. Common moderators: heavy water, graphite. Control rods (cadmium, boron) absorb neutrons. Coolant removes heat.

This question belongs to: Science Physics

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