Electromagnetic Waves and their Characteristics NEET Questions

Physics - Electromagnetic Waves

Electromagnetic Waves and their Characteristics MCQ Questions


13.
Which electromagnetic wave has the shortest wavelength?
A.
Ultraviolet
B.
Gamma rays
C.
X-rays
D.
Microwaves
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ANSWER :
B. Gamma rays
14.
What is the speed of light in vacuum?
A.
3 × 10⁶ m/s
B.
3 × 10⁸ m/s
C.
3 × 10⁵ km/s
D.
3 × 10¹⁰ cm/s
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ANSWER :
B. 3 × 10⁸ m/s
15.
Which of the following has the shortest wavelength in the electromagnetic spectrum?

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A.
Microwaves
B.
Infrared waves
C.
Radio waves
D.
X-rays
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ANSWER :
D. X-rays
16.
Which of the following statements about electromagnetic waves is incorrect?
A.
They require a medium
B.
They travel at different speeds in a vacuum
C.
They are longitudinal waves
D.
They are transverse waves
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ANSWER :
C. They are longitudinal waves
17.
The order of increasing frequency of electromagnetic waves is:
A.
Radio < Infrared < Ultraviolet < X-rays
B.
Infrared < Visible < Ultraviolet < X-rays
C.
Radio < Infrared < Visible < Ultraviolet
D.
Visible < Infrared < X-rays < Gamma rays
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ANSWER :
C. Radio < Infrared < Visible < Ultraviolet
18.
The direction of propagation of an electromagnetic wave is given by:
A.
E × B
B.
B × E
C.
E / B
D.
B / E
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ANSWER :
A. E × B