set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements:

1. Principle of superposition can be used for any physical quantity.
2. Principle of superposition can be used only when amplitude of quantity is small.
3. It is not possible to have interference between the waves produced by two independent sources of same frequency.
4. For interference of two waves the phase difference between the waves remain constant.

a) 1, 2 and 3

b) 1 and 2

c) 3 and 4

d) 2, 3 and 4

Question : 2

When ice melts, then

a) Volume decreases

b) Mass increases

c) Volume increases

d) Mass decreases

Question : 3

Food in the pressure cooker is cooked faster, as

a) more steam is available at 100°C

b) the boiling point increases due to an increase in pressure

c) the boiling point decreases due to an increase in pressure

d) more pressure is available at 100°C

Question : 4

A shrill sound has a ______ pitch and a dull sound has a _____ pitch.

a) low, low

b) high, low

c) low, high

d) high, high

Question : 5

How much should minimum distance be between the source of sound and reflecting surface, so that an echo can be heard clearly?

a) 17 metre

b) 24 metre

c) 10 metre

d) 30 metre

Question : 6

What is the effect of humidity on sound waves when humidity increases?

a) Speed of sound waves remains same

b) Speed of sound waves is more

c) Speed of sound waves is less

d) Speed of sound waves becomes zero