A metal spoon placed in a hot cup of tea gets hot due to MCQ with Answer and Explanation

Question Report Error

A metal spoon placed in a hot cup of tea gets hot due to

A. Conduction

B. Radiation

C. Evaporation

D. Convection

Answer: Option A

Solution (By JKExamLibrary)

Heat travels through spoon from hot end to cold end by conduction (molecular vibration and free electrons). Handle gets hot. Metal good conductor.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The device used for detecting and measuring small electric current is

A. Ammeter

B. Voltmeter

C. Galvanometer

D. Wattmeter

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Correct Answer: Option C

Explanation:
Galvanometer is sensitive instrument for detecting presence and direction of small currents. Ammeter measures larger currents. Voltmeter potential difference. Wattmeter power.

This question belongs to: Science Physics

Question #2 Report Error

Dispersion occurs because:

A. Prism absorbs colors

B. TIR occurs

C. Different colors have different speeds in medium

D. Different frequencies

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Correct Answer: Option C

Explanation:
n varies with λ ⇒ v = c/n varies ⇒ different refraction angles (Snell's law). Frequency constant; wavelength changes in medium. Memory aid: 'Dispersion: n(λ) ⇒ v(λ) ⇒ different bending; violet bends most'. Optics concept frequently tested in competitive exams.

This question belongs to: Science Physics

Question #3 Report Error

Sound waves of frequency 20 kHz are called

A. Supersonic

B. Ultrasonic

C. Infrasonic

D. Audible

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Correct Answer: Option B

Explanation:
Above 20 kHz is ultrasonic.

This question belongs to: Science Physics

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