1
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)
2
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
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A plane electromagnetic wave of frequency $$20 \mathrm{~MHz}$$ travels through a space along $$x$$-direction. If the electric field vector at a certain point in space is $$6 \mathrm{~Vm}^{-1}$$, then what is the magnetic field vector at that point?

A
$$2 \times 10^{-8} \mathrm{~T}$$
B
$$\frac{1}{2} \times 10^{-8} \mathrm{~T}$$
C
$$2 \mathrm{~T}$$
D
$$\frac{1}{2} \mathrm{~T}$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What feature of the infrared waves make it useful for the haze photography?

A
Since it is invisible
B
Since it has large wave length
C
Since it is absorbed by the medium
D
Since it has high frequency
COMEDK Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
CBSE
Class 12