set 16 MCQ Questions & Answers Detailed Explanation

Question : 1

Opening the door of refrigerator kept in the room

a) You can cool the room to the temperature of refrigerator

b) You are warm the room a little

c) You can cool the room to some degree

d) You can neither cool nor warm the room

Question : 2

Consider the following statements:

1. If magenta and yellow coloured circles intersect, the intersected area will have red colour.
2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Question : 3

Human ears can sense sound waves travelling in air having wavelength of

a) 1m

b) 10^–3 m

c) 10^–2 m

d) 10² m

Question : 4

The reflection of sound is called echo. Which of the following conditions is/ are necessary for the formation of echo?

1. The minimum distance between the source of sound and the reflecting body should be 17 m.
2. The wavelength of sound should be less than the height of the reflecting body.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Question : 5

Maximum temperature inside pressure cooker depends on

a) Area of hole on the top and food being cooked

b) Weight kept on hole at top and food being cooked

c) Area of hole on the top and weight kept on it

d) Area of hole on the top only

Question : 6

The least distance (in cm) of distinct vision in

a) 75

b) 5

c) 25

d) 100