Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

In the absence of atmosphere around Earth, the average surface temperature of Earth

A
will increase

B
will decrease

C
will remain the same

D
cannot be decided

Solution

In the presence of the atmosphere, heat radiations reflected by the earth are further reflected back to the earth by the atmosphere, which increases the temperature. In the absence of the atmosphere, no such reflection back to earth will take place. Hence the heat radiations will be reflected back and temperature of the earth will decrease.
Question 2
1 / -0

Which of the following electromagnetic waves emitted by the sun are responsible for heating Earth's atmosphere due to greenhouse effect?

A
Visible light

B
Infrared radiation

C
Ultraviolet rays

D
γ-rays

Solution

Infrared radiations emitted by the sun are responsible for heating Earth's atmosphere due to greenhouse effect.
Question 3
1 / -0

Which of the following electromagnetic waves are used in telecommunication?

A
Radio waves

B
Visible radiations

C
Ultraviolet rays

D
Microwaves

Solution

Microwaves are used in telecommunication.
So, option 4 is correct.
Radio waves - These are used for television and radio programmes.
Visible radiation - These are used in photography.
Ultraviolet rays - These can be used to kill microbes. Hospitals use UV lamps to sterilise surgical equipment and the air in operating theatres.