999+ Physics Questions Answers Explanation MCQ

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

Explanation:

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Q:

A plane mirror produces a magnification of

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

Answer & Explanation Answer: B) +1

Explanation:

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Q:

Working of safety fuses depends upon

1. magnetic effect of the current

2. chemical effect of the current

3. magnitude of the current

4. heating effect of the current

Select the correct answer using the code given below.

A) 1, 2, 3 and 4	B) 1, 2 and 3 only
C) 3 and 4 only	D) 4 only

Answer & Explanation Answer: C) 3 and 4 only

Explanation:

An electric fuse is a device which is used to limit the current in an electric circuit. The fuse safeguards the circuit and the electrical appliances from being damaged.

The fuse wire is generally an alloy of lead and tin. It has a low melting point and breaks the circuit if the current exceeds a safe value. The thickness and length of the fuse wire depends on the maximum current allowed through the circuit.

It is connected in series in the beginning of the electric circuits.

If too many electrical appliances of high power rating (like electric iron, water heater etc) are switched on at the same time, they draw an extremely large current from the circuit. This condition is called overloading and it can cause overheating of the wiring and lead to a fire. (heating effect and magnitude of the current)

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Q:

Which of the following is a bad conductor of heat?

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

Answer & Explanation Answer: A) Wood

Explanation:

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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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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

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Q:

Calculate the pressure (in Pa) if a thrust of 1000 N is applied to an area of 5 sq.m.

A) 200	B) 50
C) 100	D) 25

Answer & Explanation Answer: A) 200

Explanation:

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Q:

Which instrument is used to measure humidity?

A) Pyrometer	B) Hydrometer
C) Hygrometer	D) Calorimeter

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