Topic: Unit V: Electromagnetic waves (Test 1)
Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.1
The dimension of 1/µ0ε0
is
A. [L T-1 ]
B. [L2T−2]
C. [L−1 T]
D. [L−2 T2]
Answer : Option B
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.2
If the amplitude of the
magnetic field is 3 × 10−6 T, then amplitude of the electric field
for a electromagnetic waves is
A. 100 V m−1
B. 300 V m−1
C. 600 V m−1
D. 900 V m−1
Answer : Option D
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.3
Which of the following
electromagnetic radiation is used for viewing objects through fog
A. microwave
B. gamma rays
C. X- rays
D. infrared
Answer : Option D
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.4
Which of the following are false for electromagnetic waves
A. transverse
B. mechanical waves
C. longitudinal
D. produced by accelerating charges
Answer : Option C
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.5
Consider an oscillator which has a charged particle and oscillates about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is
A. 1 m
B. 10 m
C. 100 m
D. 1000 m
Answer : Option A
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.6
The electric and the magnetic field, associated with an electromagnetic wave, propagating along X axis can be represented by
A. 
B. 
C. 
D. 
Answer : Option B
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.7
In an electromagnetic wave
in free space the rms value of the electric field is 3 V m−1. The
peak value of the magnetic field is
A. 1.414 × 10−8 T
B. 1.0 × 10−8 T
C. 2.828 × 10−8 T
D. 2.0 × 10−8 T
Answer : Option A
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.8
During the propagation of electromagnetic waves in a medium:
A. a. electric energy density is double of the magnetic energy density
B. b. electric energy density is half of the magnetic energy density
C. c. electric energy density is equal to the magnetic energy density
D. d. both electric and magnetic energy densities are zero
Answer : Option C
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.9
If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?.
A. 
B. 
C. 
D. 
Answer : Option B
Explaination / Solution:
No Explaination.
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Topic: Unit V: Electromagnetic waves
Tag: TN 12th Physics
Q.10
A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is
A. E/c
B. 2E/c
C. Ec
D. E/c2
Answer : Option B
Explaination / Solution:
No Explaination.
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