set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

FM broadcasting service uses the range of frequency bands between

a) 76-87 MHz

b) 54-75 MHz

c) 109-139 MHz

d) 88-108 MHz

Question : 2

Gases exert pressure on the walls of the container because the gas molecules

a) have finite volume

b) possess momentum

c) collide with each other

d) obey gas laws

Question : 3

Which one of the following statement is not correct?

a) In summer, white or light coloured clothes are preferred to dark coloured clothes generally

b) Concave mirrors are used in searchlights

c) Mirage is an optical illusion arising due to total internal reflection of light

d) Convex mirror with a small aperture is used by doctors to examine, ear, nose or throat of a patient

Question : 4

The cloudy nights are warmer than clear nights because

a) Clouds absorb Sunlight during the day and radiate the same in night

b) Clouds make the atmosphere damp and generate heat

c) The clouds prevent radiation of heat from the ground and the air

d) The clouds obstruct the movement of air which creates heat

Question : 5

Consider the following three statements

1. Heating 1 kg of water from 10°C to 50°C
2. Melting 600 g of ice at 0°C
3. Converting 300 g of ice at 0°C to water at 50°C

a) 2, 1, 3

b) 1, 2, 3

c) 3, 2, 1

d) 3, 1, 2

Question : 6

On adding common salt to water, the boiling point and freezing point of water will

a) Decrease

b) Decrease and increase respectively

c) Increase

d) Increase and decrease respectively