set 14 MCQ Questions & Answers Detailed Explanation

Question : 1

Wireless communication is reflected back to the Earth’s surface by the

a) Ionosphere

b) Stratosphere

c) Troposphere

d) Exosphere

Question : 2

Match List I with List II and select the correct answer using the codes given below the lists

a) A – 3, B – 4, C – 2, D – 1

b) A – 2, B – 3, C – 4, D – 1

c) A – 2, B – 1, C – 4, D – 3

d) A – 4, B – 3, C – 1, D – 2

Question : 3

On a specific day and time, the temperature was 48ºC in Churu and 24ºC in Shimla. Two metallic cups identical in all respects contained water at 95ºC in Churu and 71ºC in Shimla. Which one of these two cups reached room temperature first?

a) Cup in Shimla

b) Both cups reached room temperature at the same time

c) Cup in Churu

d) Data are not enough to find out result

Question : 4

The frequency of a wave travelling at a speed of 500 ms^–1 is 25Hz. Its time period is

a) 25 s

b) 20 s

c) 0.05 s

d) 0.04 s

Question : 5

Consider the following statements:

1. Steam at 100°C and boiling water at 100°C contain same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils.

a) 2 and 3

b) 1 and 2

c) Only 2

d) Only 3

Question : 6

Consider the following phenomena.

1. Size of the Sun at dusk
2. Colour of the Sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky

a) 1, 2 and 4

b) 3, 4 and 5

c) 1, 2 and 3

d) 2, 3 and 5