set 10 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is a mechanical wave?

a) Light waves

b) X-rays

c) Radio waves

d) Sound waves

Question : 2

Consider the following statements.
Assertion (A):
Light coloured clothes are preferred in summer.
Reason (R):
Light colours are poor absorbers of heat.
Select correct answer from the code given below.

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

b) (A) is true, but (R) is false

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

d) (A) is false, but (R) is true

Question : 3

Consider the following statements :

1. 10 g of ice at 0°C and 10 g of water at 0°C contain same amount of heat.
2. The specific heat of ice at 0°C is equal to that of water at 0°C.

a) 1 and 2 both

b) 2 only

c) 1 only

d) None

Question : 4

Which one among the following statements about thermal conductivity is correct ?

a) Steel > Water > Wood

b) Steel > Wood > Water

c) Water > Steel > Wood

d) Water > Wood > Steel

Question : 5

Consider the following statements:

1. The sun looks red at sunset because most of the blue light in sunrays is scattered leaving behind red and yellow lights.
2. Clouds look white because water droplets of clouds scatter all colours of light equally.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Question : 6

Triple point is the temperature at which

a) matter may simultaneously exist in solid and gaseous state.

b) matter may simultaneously exist in liquid and gaseous state.

c) matter may simultaneously exist in liquid and solid state.

d) matter may simultaneously exist in all the three forms.