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Free download in PDF Class 12 Physics Chapter 8 Electromagnetic Waves Current Induction Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
A plane electromagnetic wave is incident on a material surface. The wave delivers momentum p and energy E. Then
[A]
p ≠ 0, E ≠ 0
[B]
p = 0, E = 0
[C]
p = 0, E ≠ 0
[D]
p ≠ 0, E = 0
(2)
The electric and magnetic field of an electromagnetic wave are:
[A]
in opposite phase and perpendicular to each other
[B]
in opposite phase and parallel to each other
[C]
in phase and perpendicular to each other
[D]
in phase and parallel to each other
Answer: in phase and perpendicular to each other
(3)
The electromagnetic wave used to treat muscular pain is:
[A]
VHF radiowaves
[B]
X-rays
[C]
Ultraviolet rays
[D]
Infrared radiations
Answer: Infrared radiations
(4)
A beam of light travelling along x-axis is described by the magnetic field Bz = 5 X 10-7T sinω(t – x/c) If a beam of alpha particle moves in this filed along y – axis with a speed of 3 X 107 m/s, then the maximum electric and magnetic forces experienced by it will be:
[A]
4.80 X 10-10N and 4.8 X 10-12N respectively.
[B]
4.80 X 10-17N and 4.8 X 10-18N respectively.
[C]
2.80 X 10-5N and 2.1 X 10-7N respectively.
[D]
1.5 X 10-5N and 4.1 X 10-7N respectively.
Answer: 4.80 X 10-17N and 4.8 X 10-18N respectively.
(5)
An electromagnetic wave propagating along north has its electric field vector upwards. Its magnetic field vector point towards
[A]
north
[B]
east
[C]
west
[D]
downwards
(6)
According to Maxwell’s hypothesis, a changing electric field gives rise to
[A]
an e.m.f
[B]
electric displacement current
[C]
magnetic field
[D]
pressure gradient
(7)
Which of the following has/have zero average value in a plane electromagnetic wave?
[A]
Both magnetic and electric field
[B]
Electric field only
[C]
Magnetic energy
[D]
Electric energy
Answer: Both magnetic and electric field
(8)
Select the wrong statement. EM waves
[A]
are transverse in nature.
[B]
travel in free space at a speed of light.
[C]
are produced by accelerating charges.
[D]
travel in all media with same speed.
Answer: travel in all media with same speed.
(9)
An electron oscillating with a frequency of 3 × 106 Hz, would generate
[A]
X-rays
[B]
ultraviolet rays
[C]
radio waves
[D]
microwaves
(10)
Displacement current goes through the gap between the plates of a capacitor when the charge on the capacitor
[A]
is changing with time
[B]
decreases
[C]
does not change
[D]
decreases to zero
Answer: is changing with time
(11)
If a variable frequency ac source connected to a capacitor then with decrease in frequency, the displacement current will
[A]
increase
[B]
decrease
[C]
remain constant
[D]
first decrease then increase
(12)
The current in the electric circuit which arises due to flow of electrons in the connecting wires of the circuit in a defined closed path is called
[A]
alternating current
[B]
direct current
[C]
conduction current
[D]
displacement current
Answer: conduction current
(13)
The polarisation of electromagnetic wave is in
[A]
the directions of electric and magnetic field
[B]
the directions of electric field
[C]
the direction of magnetic field
[D]
can not be polarized
Answer: the directions of electric field
(14)
The electromagnetic waves do not transport
[A]
energy
[B]
charge
[C]
momentum
[D]
information
(15)
The electromagnetic radiation used in food processing sterilizing agent is
[A]
microwaves
[B]
UV rays
[C]
gamma rays
[D]
radio waves
(16)
The waves used in telecommunication are
[A]
IR
[B]
UV
[C]
Microwave
[D]
Cosmic rays
(17)
What is the cause of “Green house effect”?
[A]
Infrared rays
[B]
Ultraviolet rays
[C]
X-rays
[D]
Radio waves
(18)
Radio waves do not penetrate in the band of
[A]
ionosphere
[B]
mesosphere
[C]
troposphere
[D]
stratosphere
(19)
The wavelength of X-ray is of the order of
[A]
1 metre
[B]
1 cm
[C]
1 micron
[D]
1 angstrom
(20)
The range of wavelength of visible light is
[A]
50 Å to 500 Å
[B]
4000 Å to 8000 Å
[C]
9000 Å to 25,000 Å
[D]
15,000 Å to 25,000 Å
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