Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 4

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

Clouds are contained in a layer from the earth’s surface, which is called

A
Troposphere

B
Stratosphere

C
Mesosphere

D
Ionosphere
Question 2
4 / -1

Radio waves of constant amplitude can be generated with

A
rectifier

B
filter

C
F.E.T

D
Oscillator
Question 3
4 / -1

If a source is transmitting electromagnetic wave of frequency 8.2 × 10⁶ Hz, then wavelength of the electro-magnetic waves transmitted from the source will be

A
36.6 m

B
40.5 m

C
42.3 m

D
50.9 m

Solution
Question 4
4 / -1

Which of the following rays are not electromagnetic wave?

A
X-rays

B
γ-rays

C
β-rays

D
heat rays
Question 5
4 / -1

An electromagnetic wave of frequency v = 3.0 MHz passes vacuum into a delectric medium with permittivity ∈ = 4.0. Then

A
wavelength is doubled and the frequency remains unchanged

B
wavelength is doubled and frequency becomes half

C
wavelength is halved and frequency remains unchanged

D
wavelength and frequency both remain unchanged

Solution
Question 6
4 / -1

If λ_v, λ_x and λ_m represent the wavelengths of visible light, x-rays and microwave respectively, then

A
λ_m > λ_x > λ_v

B
λ_v > λ_m > λ_x

C
λ_v > λ_x > λ_m

D
λ_m > λ_v > λ_x
Question 7
4 / -1

A
0.46 rad m^-1

B
3 rad m^-1

C
1.66 rad m^-1

D
0.83 rad m^-1

Solution
Question 8
4 / -1

A
[ML²T^-1]

B
[ML^-1T^-2]

C
[ML²T^-2]

D
[MLT^-1]

Solution
Question 9
4 / -1

An electromagnetic wave in vacuum has the electric and magnetic fields E and B, which are always perpendicular to each other. The direction of polarisation is given by X and that of wave propagation by k. Then,

A

B

C

D

Solution
Question 10
4 / -1

Which of the following relations is correct ?

A

B

C

D

Solution