physics : class12 Radio Wave Spectrum : Radio Waves : Electromagnetic Waves MCQ Questions and Answers
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Radio Wave Spectrum
MCQ questions and answers.
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MCQ Questions
1. Which characteristic increases as we move from lower-frequency radio waves to higher-frequency radio waves in the radio wave spectrum?
A.
Wavelength
B.
Frequency
C.
Time period
D.
Wave speed in vacuum
Correct Answer:
Frequency
Explanation:
The radio wave spectrum is arranged according to frequency, and frequency increases from lower-frequency to higher-frequency radio waves.
2. Which radio waves have the longest wavelength?
A.
High-frequency radio waves
B.
Medium-frequency radio waves
C.
Low-frequency radio waves
D.
Microwaves
Correct Answer:
Low-frequency radio waves
Explanation:
Wavelength is inversely proportional to frequency, so low-frequency radio waves have the longest wavelengths.
3. Which radio waves have the highest frequency among the following?
A.
Long-wave radio waves
B.
Short-wave radio waves
C.
Microwaves
D.
Very-low-frequency radio waves
Correct Answer:
Microwaves
Explanation:
Microwaves occupy the higher-frequency part of the radio wave spectrum compared with long-wave, short-wave, and very-low-frequency radio waves.
4. Radio waves are generally arranged in their spectrum according to their:
A.
Brightness
B.
Frequency
C.
Temperature
D.
Intensity only
Correct Answer:
Frequency
Explanation:
The radio wave spectrum classifies radio waves into different regions mainly on the basis of their frequency.
5. Which pair represents the correct order of increasing frequency in the radio wave spectrum?
A.
Long waves, medium waves, short waves
B.
Short waves, medium waves, long waves
C.
Medium waves, long waves, short waves
D.
Short waves, long waves, medium waves
Correct Answer:
Long waves, medium waves, short waves
Explanation:
Long waves have lower frequencies than medium waves, while medium waves have lower frequencies than short waves.
6. Which type of radio wave is commonly associated with AM broadcasting?
A.
Long-wave radio
B.
Medium-wave radio
C.
Microwave
D.
Infrared wave
Correct Answer:
Medium-wave radio
Explanation:
AM broadcasting commonly uses medium-frequency radio waves, which form a region of the radio wave spectrum.
7. FM broadcasting generally uses which part of the radio wave spectrum compared with AM broadcasting?
A.
A lower-frequency part
B.
A higher-frequency part
C.
The same frequency range in every case
D.
The visible-light part
Correct Answer:
A higher-frequency part
Explanation:
FM broadcasting generally operates at higher radio frequencies than AM broadcasting.
8. What happens to the wavelength of a radio wave when its frequency is increased?
A.
It increases
B.
It decreases
C.
It remains infinite
D.
It becomes equal to its frequency
Correct Answer:
It decreases
Explanation:
For electromagnetic waves traveling at the same speed, wavelength and frequency are inversely related.
9. Which region lies at the higher-frequency end of the radio wave spectrum?
A.
Long-wave region
B.
Medium-wave region
C.
Microwave region
D.
Very-low-frequency region
Correct Answer:
Microwave region
Explanation:
Microwaves are located at the higher-frequency and shorter-wavelength end of the radio wave spectrum.
10. Which statement about radio waves in the spectrum is correct?
A.
All radio waves have exactly the same frequency
B.
Higher-frequency radio waves have shorter wavelengths
C.
Lower-frequency radio waves have shorter wavelengths
D.
Radio waves are arranged according to their color
Correct Answer:
Higher-frequency radio waves have shorter wavelengths
Explanation:
The relation c = fλ shows that, at constant speed, an increase in frequency produces a decrease in wavelength.
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