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 - 1
Question 1:
Which of the following statement is incorrect.
(a) X-rays have minimum ionising power.
(b) α-rays have maximum ionizing power.
(c) ß-rays have maximum penetrating power.
(d) α-rays haye more penetrating power than a-rays.
Correct Answer – (C)
Question 2 :
Normal light is due to:
(a) electric field oscillations.
(b) magnetic field oscillations.
(c) oscillations of electric and magnetic fields in mutually perpendicular directions.
(d) None.
Correct Answer – (C)
Question 3 :
The physical properties shared by both radiowaves and sound waves are:
(i) both can be polarised.
(ii) both can be reflected.
(iii) both can be diffracted.
(a) if (i), (ii), (iii) all are correct.
(b) if (ii), (iii) are correct.
(c) if only (i) is correct.
(d) None of these.
Correct Answer – (B)
Question 4 :
Which of the following waves are used in telecommunication.
(a) visible light
(b) microwaves
(c) ultraviolet
(d) infrared
Correct Answer – (B)
Question 5 :
The frequency of visible light is of the order of.
(a) 1012 Hz
(b) 1015 Hz
(c) 108 Hz
(d) 1018 Hz
Correct Answer – (B)
MCQ Questions Class 12 Electromagnetic Waves with Answers
Question 6 :
The strong radiation emitted in an electrical arc is:
(a) Infrared radiation
(b) Ultraviolet radiation
(c) y-rays
(d) X-rays
Correct Answer – (B)
Question 7 :
The wavelength of X-rays is of the order of:
(a) 1 cm
(b) 1 angstrom
(c) 1 micron
(d) 1 m
Correct Answer – (B)
Question 8 :
The displacement current flows in the dielectric of the capacitor, when the potential difference across its plates:
(a) changes (increases/decreases) with time.
(b) changes with distance.
(c) attains a constant value.
(d) None of these.
Correct Answer – (A)
Question 9 :
(a) 1/√(µE)
(b) 1/√(µ0ε0)
(c) √(µ/ε)
(d) 1/(µE)
Correct Answer – (A)
Question 10 :
Which of the following has the lowest frequency.
(a) Infraredrays
(b) X-rays
(c) UV rays
(d) γ-rays
Correct Answer – (A)
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