set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

The principle reason why it is better to have two eyes than one is that

a) It gives a man a type of vision known as mosaic vision

b) By having two eyes we can easily see in the dark as well in dim light

c) By having two eyes we can distinguish colour easily

d) It enhances distance and depth perception in us

Question : 2

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 : 3

When ice melts, then

a) Volume decreases

b) Mass increases

c) Volume increases

d) Mass decreases

Question : 4

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 : 5

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

Question : 6

Which of the following statements is correct ?

a) Frequency of ultrasonic waves is of the same order as that of X-rays

b) Ultrasonic waves can travel in vacuum

c) Wavelength of ultrasonic waves is of the same order as that of microwaves

d) Speed of ultrasonic waves is of the same order as that of light