Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

Consider the following statements about electromagnetic radiations; All of them
(i) have energy
(ii) exert pressure on an object
(iii) have the same momentum
Of these statements

A
(i), (ii) and (iii) are correct

B
(i) and (ii) are correct

C
(ii) and (iii) are correct

D
(i) and (iii) are correct
Question 2
4 / -1

Television signals reach us only through the ground waves. The range R related with the transmitter height h is in proportion to

A
h

B

C

D

Solution
Question 3
4 / -1

In T.V. broadcasting both picture and sound are transmitted simultaneously.
In this

A
audio signal is frequency modulated and video signal is amplitude modulated

B
both audio and video signals are frequency modulated

C
audio signal is amplitude modulated and video signal is frequency modulated

D
both audio and video signals are amplitude modulated
Question 4
4 / -1

Which of the following radiations has the least wavelength?

A
γ-rays

B
β-rays

C
α-rays

D
X-rays
Question 5
4 / -1

Sodium lamps are used in foggy conditions because

A
yellow light is scattered less by the fog particles

B
yellow light is scattered more by the fog particles

C
yellow light is unaffected during its passage through the fog

D
wavelength of yellow light is the mean of the visible part of the spectrum
Question 6
4 / -1

The region of the atmosphere above troposphere is known as

A
lithosphere

B
uppersphere

C
ionosphere

D
strato-sphere
Question 7
4 / -1

If c is the speed of electromagnetic waves in vacuum, its speed v in a medium of dielectric constant K and relative permeability μ_r is

A

B

C

D

Solution
Question 8
4 / -1

The electric field ( in NC^-1) in an electromagnetic wave is given by E = 50 sin ω (t-x/c) The energy stored in a cylinder of crossection 10 cm² and length 100 cm along the x-axis will be

A

B

C

D

Solution
Question 9
4 / -1

Who produced the electromagnetic waves first ?

A
Marconi

B
Maxwell

C
J.C. Bose

D
Hertz
Question 10
4 / -1

A

B

C

D