Electromagnetic Spectrum(Radio Waves, Microwaves, Infrared, Visible, Ultraviolet. X-rays. Gamma Rays) NEET Questions

Physics - Electromagnetic Waves

Electromagnetic Spectrum(Radio Waves, Microwaves, Infrared, Visible, Ultraviolet. X-rays. Gamma Rays) MCQ Questions


1.
What is the electromagnetic spectrum?
A.
The arrangement of charged particles by their energy levels
B.
The range of mechanical waves that can propagate through a vacuum
C.
The spectrum of visible light only — from violet to red
D.
The orderly arrangement of all electromagnetic waves in order of their increasing wavelength (or decreasing frequency), ranging from gamma rays to radio waves
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ANSWER :
D. The orderly arrangement of all electromagnetic waves in order of their increasing wavelength (or decreasing frequency), ranging from gamma rays to radio waves
2.
Which of the following is the correct order of EM waves from LOWEST to HIGHEST frequency?
A.
Gamma rays → X-rays → UV → Visible → IR → Microwaves → Radio waves
B.
Visible → UV → IR → X-rays → Radio → Microwaves → Gamma rays
C.
IR → UV → Visible → Radio → X-rays → Microwaves → Gamma rays
D.
Radio waves → Microwaves → Infrared → Visible → Ultraviolet → X-rays → Gamma rays
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ANSWER :
D. Radio waves → Microwaves → Infrared → Visible → Ultraviolet → X-rays → Gamma rays
3.
All electromagnetic waves in vacuum have the SAME:
A.
Energy per photon
B.
Frequency
C.
Speed — c = 3 × 10⁸ m/s (speed of light in vacuum), regardless of frequency or wavelength
D.
Wavelength
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ANSWER :
C. Speed — c = 3 × 10⁸ m/s (speed of light in vacuum), regardless of frequency or wavelength
4.
Electromagnetic waves are TRANSVERSE waves. This means:
A.
The E and B field vectors oscillate parallel to the direction of propagation
B.
Only the E field oscillates — the B field provides the propagation direction
C.
The oscillating electric (E) and magnetic (B) field vectors are perpendicular to each other AND perpendicular to the direction of wave propagation
D.
The E field oscillates but the B field is constant
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ANSWER :
C. The oscillating electric (E) and magnetic (B) field vectors are perpendicular to each other AND perpendicular to the direction of wave propagation
5.
Electromagnetic waves can travel through vacuum. This distinguishes them from:
A.
Mechanical waves (sound, water waves, seismic waves) which require a material medium for propagation
B.
Transverse waves — only longitudinal waves can travel through vacuum
C.
Waves with wavelengths shorter than visible light
D.
Waves that carry energy — EM waves do not carry energy
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ANSWER :
A. Mechanical waves (sound, water waves, seismic waves) which require a material medium for propagation
6.
The relationship between the speed (c), frequency (ν) and wavelength (λ) of an EM wave is:
A.
c = λ/ν²
B.
c = ν/λ
C.
c = ν²/λ
D.
c = νλ (wave speed = frequency × wavelength), so ν = c/λ and λ = c/ν
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ANSWER :
D. c = νλ (wave speed = frequency × wavelength), so ν = c/λ and λ = c/ν