1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The electric and magnetic fields associated with an electromagnetic wave propagating along +z axis, can be represented by
A
$E=E_0 i, \quad B=B_0 j$
B
$E=E_0 i, \quad B=B_0 k$
C
$E=E_0 k, \quad B=B_0 j$
D
$E=E_0 j, \quad B=B_0 k$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Column - I lists the waves of the electromagnetic spectrum. Column - II gives approximate frequency range of these waves. Match Column - I and Column - II and choose the correct match from the given choices.

Column I Column II
(A) Radiowaves (P) $$
10^{18} \text { to } 10^{20} \mathrm{~Hz}
$$
(B) Microwaves (P) $$
10^{11} \text { to } 5 \times 10^{14} \mathrm{~Hz}
$$
(C) Infrared (R) $$
10^4 \text { to } 10^8 \mathrm{~Hz}
$$
(D) X-rays (S) $$
10^9 \text { to } 10^{12} \mathrm{~Hz}
$$

A
(A)-(R) (B)-(P) (C)-(S) (D)-(Q)
B
(A)-(R) (B)-(S) (C)-(Q) (D)-(P)
C
(A)-(R) (B)-(S) (C)-(P) (D)-(Q)
D
(A)-(R) (B)-(Q) (C)-(S) (D)-(P)
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An electromagnetic wave of frequency $$3 \mathrm{~MHz}$$ passes from vacuum into a dielectric medium $$(\mu_r=1)$$ of relative permittivity 4.0. Then,

A
Wavelength is halved and frequency is doubled
B
Wavelength doubled and frequency remains unchanged
C
Wavelength and frequency are unchanged
D
Wavelength is halved and frequency remains unchanged
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of amplitude of magnetic field to the amplitude of electric field of an electromagnetic wave propagating in vacuum is

A
reciprocal of speed of light in vacuum
B
the speed of light in vacuum
C
proportional to frequency of the electromagnetic wave
D
inversely proportional to the frequency of the electromagnetic wave
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