Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 2

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Weekly Quiz Competition

Question 1
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 2
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.
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.
Question 3
1 / -0

Visible light is due to

A
electric field oscillations

B
magnetic field oscillations

C
oscillations of electric and magnetic fields in the same direction

D
oscillations of electric and magnetic fields in the same direction

Solution

Visible light is the electromagnetic radiations in which oscillating electric field and the magnetic field are perpendicular to each other; both are also perpendicular to the direction of propagation of the wave.