Check the below NCERT MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have provided Electromagnetic Waves Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.
Class 12 Physics Chapter 8 MCQ With Answers
Physics Class 12 Chapter 8 MCQs On Electromagnetic Waves
MCQ On Electromagnetic Waves Class 12 Question 1.
The dimensional formula of \(\vec{E}\) is:
(a)[MLT-2A-1]
(b) [MLT-3A-1]
(c) [MLT-2A-2]
(d) None of these
Answer
Answer: (b) [MLT-3A-1]
Electromagnetic Waves Class 12 MCQ Question 2.
The dimensional formula of is:
(a) [MLT-2A-1]
(b) [ML0T-2A-1]
(c) [ML0T-3A-1]
(d) None of these
Answer
Answer: (b) [ML0T-2A-1]
Electromagnetic Waves MCQ Class 12 Question 3.
Which of the following has the dimensions of current?
(a) ε0 \(\vec{E}\).\(\vec{dt}\)
(b) µ0 \(\vec{E}\).\(\vec{dt}\)
(c) \(\frac{\vec{B}.\vec{dl}}{µ_0}\)
(d) \(\frac{\vec{B}.\vec{dl}}{ε_0}\)
Answer
Answer: (c) \(\frac{\vec{B}.\vec{dl}}{µ_0}\)
MCQ On Electromagnetic Waves Class 12 Question 4.
Which of the following has the dimensions of charge?
(a) \(\frac{ε_0\vec{E}}{\vec{ds}}\)
(b) µ0 \(\vec{E}\).\(\vec{ds}\)
(c) \(\frac{ε_0}{µ_0}\) \(\vec{E}\).\(\vec{ds}\)
(d) \(\frac{µ_0}{ε_0}\) \(\vec{E}\).\(\vec{ds}\)
Answer
Answer: (a) \(\frac{ε_0\vec{E}}{\vec{ds}}\)
Class 12 Physics Chapter 8 MCQ Question 5.
Maxwell’s equation involving \(\frac{d}{dt}\) \(\vec{B}\) is obtained-from:
(a) Ampere’s law
(b) Gauss’s law
(c) Faraday’s law
(d) Biot-Savart’s law
Answer
Answer: (c) Faraday’s law
Electromagnetic Waves MCQ Pdf Class 12 Question 6.
The dimensions of \(\vec{E}\), \(\vec{dl}\) are identical to that of:
(a) potential
(b) charge
(c) current
(d) None of these
Answer
Answer: (a) potential
Electromagnetic Waves MCQ Questions Class 12 Question 7.
Which of the following laws was modified by Maxwell by introducing the displacement current?
(a) Gauss’s law
(b) Ampere’s law
(c) Biot-Savart’s law
(d).None of these
Answer
Answer: (b) Ampere’s law
MCQ On Electromagnetic Wave With Answers Class 12 Question 8.
Choose the wave relevant to telecommunication :
(a) ultraviolet
(b) infrared
(c) microwave
(d) visible light
Answer
Answer: (c) microwave
MCQs On Electromagnetic Waves Class 12 Question 9.
Electromagnetic waves have a speed of
(a) 3 × 105 kms-1
(b)3 × 106 kms-1
(c) 3 × 107 kms-1
(d) 3 × 108 kms-1
Answer
Answer: (a) 3 × 105 kms-1
Electromagnetic Waves Are Produced By MCQ Class 12 Question 10.
Which of the following EMW has highest wavelength?
(a) X-ray
(b) ultraviolet rays
(c) infrared rays
(d) microwaves
Answer
Answer: (c) infrared rays
Electromagnetic Waves MCQs Class 12 Question 11.
Displacement current is due to:
(a) the flow of electrons
(b) the Varying electric field
(c) the ionization of atmosphere
(d) the flow of protons
Answer
Answer: (b) the Varying electric field
Electromagnetic Waves Objective Questions Class 12 Question 12.
Displacement current is always :
(a) equal to conduction current
(b) less than conduction current
(c) greater than conduction current
(d) the sum of current due to flow of positive and negative ions
Answer
Answer: (a) equal to conduction current
Electromagnetic Waves MCQs Class 12 Question 13.
EMW are produced by:
(a) charge in uniform motion only
(b) charge at rest only
(c) accelerated or decelerated charge only
(d) all of the above
Answer
Answer: (c) accelerated or decelerated charge only
Electromagnetic Wave MCQ Class 12 Question 14.
Who first demonstrated the existence of em waves?
(a) Hertz
(b) Maxwell
(c) Ampere
(d) Faraday
Answer
Answer: (a) Hertz
MCQ On Displacement Current Class 12 Question 15.
If \(\vec{B}\) is the magnetic field vector and \(\vec{E}\) is the electric field vector in an em wave, then which of the following relations is correct? Here c is the speed of fight:
(a) c = \(\frac{E}{B}\)
(b) c = BE
(c) c = \(\frac{B}{E}\)
(d) c = \(\frac{1}{EB}\)
Answer
Answer: (a) c = \(\frac{E}{B}\)
Question 16.
The dimensions of E/Bare same as that of:
(a) charge
(b) current
(c) velocity
(d) acceleration
Answer
Answer: (c) velocity
Question 17.
Name the law which states that a varying electric field produces a magnetic field:
(a) Biot-Savart’s law
(b) Faraday’s law
(c) Modified Ampere’s law
(d) None of these
Answer
Answer: (c) Modified Ampere’s law
Question 18.
The existence of EMW was experimentally established by :
(a) Sir S. C. Bose
(b) Maxwell
(c) Marconi
(d) Hertz
Answer
Answer: (a) Sir S. C. Bose
Question 19.
An EMW of v = 3 MHz passes from vacuum into dielectric medium with permittivity Er = 4, then:
(a) Wavelength is doubled and the frequency remains unchanged
(b) Wavelength is doubled and the frequency become half
(c) Wavelength is halved and the frequency remains unchanged
(d) Wavelength and frequency both remain unchanged
Answer
Answer: (c) Wavelength is halved and the frequency remains unchanged
Question 20.
Frequency of a wave is 6 × 1015. Hz. The wave is :
(a) Radiowave
(b) Microwave
(c) X-ray
(d) Ultra violet
Answer
Answer: (d) Ultra violet
Question 21.
Choose the wrong statement?
(a) Electromagnetic waves are transverse
(b) Electromagnetic waves travel with the speed of light in free space
(c) Electromagnetic waves are produced by accelerating charges
(d) Electromagnetic waves travel with the same speed in all media
Answer
Answer: (d) Electromagnetic waves travel with the same speed in all media
Question 22.
If ue and um arc the electric and magnetic field densities in an electromagnetic wave, then (c is the speed of light):
(a) ue = um
(b) ue = c um
(c) ue = \(\frac{u_m}{c}\)
(d) None of these
Answer
Answer: (a) ue = um
Question 23.
Solar radiation is :
(a) transverse EMW
(b) longitudinal EMW
(c) both (a) and (b)
(d) None of these
Answer
Answer: (a) transverse EMW
Question 24.
Ampere’s circuital law was modified by:
(a) Laplace
(b) Gauss
(c) Maxwell
(d) Hertz
Answer
Answer: (c) Maxwell
Question 25.
Light Year is the unit of:
(a) distance
(b) time
(c) energy
(d) intensity of light
Answer
Answer: (a) distance
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