CBSE Class 12 Electromagnetic Waves Multiple Choice Questions with Answers. MCQ Questions Class 12 Electromagnetic Waves with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Electromagnetic Waves MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Electromagnetic Waves with Answers - Set - 3
Question 1:
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
Correct Answer – (D)
Question 2 :
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
Correct Answer – (C)
Question 3 :
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
Correct Answer – (C)
Question 4 :
Who first demonstrated the existence of em waves?
(a) Hertz
(b) Maxwell
(c) Ampere
(d) Faraday
Correct Answer – (A)
Question 5 :
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
Correct Answer – (A)
MCQ Questions Class 12 Electromagnetic Waves with Answers
Question 6 :
Frequency of a wave is 6 × 1015. Hz. The wave is :
(a) Radiowave
(b) Microwave
(c) X-ray
(d) Ultra violet
Correct Answer – (D)
Question 7 :
The existence of EMW was experimentally established by :
(a) Sir S. C. Bose
(b) Maxwell
(c) Marconi
(d) Hertz
Correct Answer – (A)
Question 8 :
The dimensions of E/Bare same as that of:
(a) charge
(b) current
(c) velocity
(d) acceleration
Correct Answer – (C)
Question 9 :
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
Correct Answer – (C)
Question 10 :
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
Correct Answer – (B)
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