set 16 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

In driving a car which type of mirror would you like to use for observing traffic at your back?

a) Convex mirror

b) Spherical mirror

c) Concave mirror

d) Plain mirror

Question : 4

Rear-view mirror used in a vehicle is a

a) plane mirror

b) concave mirror

c) convex mirror

d) None of these

Question : 5

Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure?

a) f-8, 1/250

b) f-16, 1/125

c) f-22, 1/60

d) f-5.6, 1/1000

Question : 6

At sunrise or at sunset the sun appears to be reddish while at mid-day it looks white. This is because

a) refraction causes this phenomenon

b) scattering due to dust particles and air molecules causes this phenomenon

c) the sun is cooler at sunrise or at sunset

d) diffraction sends red rays to the earth at these times