999+ Physics Questions Answers Explanation MCQ

Q:

What will be the force of attraction between two bodies weighing 20 kg and 50 kg, respectively, with a distance of 2 metre between them?

A) 16.675 x 10-11 N	B) 166.75 x 10-10 N
C) 6.67 x 10-11 N	D) 16.67 x 5-10 N

Answer & Explanation Answer: B) 166.75 x 10-10 N

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Q:

Which one of the following is not a property of electromagnetic waves?

A) Electromagnetic waves do not show interference and diffraction.	B) Oscillating electric field and magnetic field are perpendicular to each other.
C) Electromagnetic waves are transverse waves	D) Electromagnetic waves do not require a medium to propagate.

Answer & Explanation Answer: A) Electromagnetic waves do not show interference and diffraction.

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Q:

The boiling point of liquids vary as

A) pressure varies	B) temperature varies
C) volume varies	D) density varies

Answer & Explanation Answer: A) pressure varies

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Q:

Warm air is ______.

A) heavier than cold air hence warm air rises up	B) lighter than cold air hence warm air moves down
C) lighter than cold air hence warm air rises up	D) heavier than cold air hence warm air moves down

Answer & Explanation Answer: C) lighter than cold air hence warm air rises up

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Q:

Heavy water is mostly used in which of the following?

A) In fire extinguisher	B) In nuclear reactors
C) In washing cloth	D) In both Nuclear reactors and Fire extinguisher

Answer & Explanation Answer: B) In nuclear reactors

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Q:

Air expands when it _______________.

A) is cooled	B) is heated
C) is under pressure	D) becomes more humid

Answer & Explanation Answer: B) is heated

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Q:

In the equation of motion $2 as = v^{2} - u^{2}$ , s represents _________________.

A) speed	B) displacement
C) velocity	D) acceleration

Answer & Explanation Answer: B) displacement

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Q:

What is the heat generated (in J) in a heating element of resistance 1000 Ω when a current of 0.1 A passes through it for 25 seconds?

A) 250	B) 2500
C) 125	D) 1250

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