999+ Physics Questions Answers Explanation MCQ

Q:

Which one among the following components is used as an amplifying device?

A) Transformer	B) Diode
C) Capacitor	D) Transistor

Answer & Explanation Answer: D) Transistor

Explanation:

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Q:

If the radius of the earth decreases and its mass remains the same, then the value of "acceleration due to gravity" will _____ .

A) decrease	B) increase
C) remain the same	D) become zero

Answer & Explanation Answer: B) increase

Explanation:

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Q:

The material used in electric heater is

A) Tungsten	B) Nichrome
C) Brass	D) Steel

Answer & Explanation Answer: B) Nichrome

Explanation:

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Q:

A galvanometer can be converted to a voltmeter by connecting

A) a high resistance in parallel	B) a high resistance in series
C) a low resistance in series	D) a low resistance in parallel

Answer & Explanation Answer: B) a high resistance in series

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Q:

The distance-time graph for the motion of an object moving with a constant speed is a __________.

A) Dot	B) Circle
C) Straight Line	D) Curve

Answer & Explanation Answer: C) Straight Line

Explanation:

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Q:

Which of the following pairing is incorrect

A) Hygrometer - Water vapour content of the atmosphere	B) Lactometer - Specific gravity of liquids
C) Anemometer - Speed of the wind	D) Seismograph - Earthquakes

Answer & Explanation Answer: B) Lactometer - Specific gravity of liquids

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Q:

Which electromagnetic wave has the highest frequency?

A) Gamma Rays	B) Radio waves
C) X rays	D) Microwaves

Answer & Explanation Answer: A) Gamma Rays

Explanation:

In all Electromagnetic waves, Gamma Rays have the highest frequency and the lowest wavelength. Whereas Radio ways have lowest Frequency and the highest wavelength.

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Q:

Which among the following is false about displacement?

A) It can be positive, negative or zero	B) Displacement is never greater than Distance
C) Its SI unit is meter	D) It is always positive

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