set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

The velocity of sound in any gas depends upon

a) intensity of sound waves only

b) wavelength of sound only

c) density and elasticity of gas

d) amplitude and frequency of sound

Question : 2

When water is heated from 0ºC to 10ºC. It’s volume

a) Decreases

b) Does not change

c) Increases

d) First decreases and then increases

Question : 3

The body temperature of a healthy man is

a) 37° Fahrenheit

b) 98.4° Celsius

c) 37° Celsius

d) 98.4° Kelvin

Question : 4

Assertion (A):
Steam is more harmful for human body than the boiling water in case of burn.
Reason (R) :
Boiling water contains more heat than steam.

a) Both A and R are true, but R is not the correct explanation of A

b) Both A and R are true and R is the correct explanation of A

c) A is true, but R is false

d) A is false, but R is true

Question : 5

Consider the following statements.

1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.
2. If a person underwater looks at a coin above the water surface, the coin will appear to be at a higher level than it really is.

a) Only 2

b) Only 1

c) 1 and 2

d) Neither 1 nor 2

Question : 6

Consider the following statements.

1. The sky appears blue because of less scattering.
2. The main cause of seven colours of the rainbow is scattering of light.
3. At the time of Sunrise, the Sun appears red, due to scattering of light.

a) Only 2 is true

b) 1 and 3 are true

c) Only 1 is true

d) 2 and 3 are true