999+ Physics Questions Answers Explanation MCQ

Q:

Which of the following statements is/are INCORRECT?

A. The value of G on the moon is equal to that on the earth.

B. 26.68 x $10^{- 11}$ N is the force of gravitation between two point masses of 2 kg and 2kg kept 1 m apart.

C. Newton's law of gravitation is valid in the laboratory only.

D. Force is inversely proportional to the square of the distance between two bodies.

A) B, C and D	B) C and D only
C) Only C	D) Only A

Answer & Explanation Answer: C) Only C

Explanation:

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1 99930

Q:

1 watt is equal to 1 ____________

A) J s-1	B) J s
C) J s-2	D) J

Answer & Explanation Answer: A) J s-1

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21 98563

Q:

The working principle of a washing machine is

A) reverse osmosis	B) diffusion
C) centrifugation	D) dialysis

Answer & Explanation Answer: C) centrifugation

Explanation:

The working principle of a washing machine is centrifugation.

The_working_principle_of_a_washing_machine_is1542349278.jpg image

Centrifugation is a separation process which uses the action of centrifugal force to promote accelerated settling of particles in a solid-liquid mixture.

The washing machine consists of centrifuge for this purpose. A centrifuge is a piece of equipment that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis of spin that can be very strong.

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697 97130

Q:

It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

A) Law of inertia	B) Newton's second law
C) Newton's third law	D) Pascal's law

Answer & Explanation Answer: C) Newton's third law

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Q:

Fill in the blank with the most appropriate option.

18 volts = ___ x 3 ohms

A) 6 amperes	B) 6 watts
C) 6 milliamperes	D) 6 joules

Answer & Explanation Answer: A) 6 amperes

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0 93240

Q:

Which of the following is a bad conductor of heat?

A) Wood	B) Diamond
C) Water	D) Mica

Answer & Explanation Answer: A) Wood

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Q:

What is the heat released by a heating filament rated 20 W when it is kept on for 2 seconds?

A) 40	B) 10
C) 80	D) 20

Answer & Explanation Answer: A) 40

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1 86339

Q:

A plane mirror produces a magnification of

A) 0	B) +1
C) Infinity	D) -1

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