physics : class12 Space-Wave Propagation : Radio Waves : Electromagnetic Waves MCQ Questions and Answers
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Space-Wave Propagation
MCQ questions and answers.
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MCQ Questions
1. Space-wave propagation mainly involves radio waves traveling directly from the transmitting antenna to the receiving antenna.
A.
Through the Earth's interior
B.
Along the ground surface only
C.
Through the space between the antennas
D.
Only through the ionosphere
Correct Answer:
Through the space between the antennas
Explanation:
In space-wave propagation, radio waves travel through the space between the transmitting and receiving antennas, usually along a nearly straight line.
2. Space-wave propagation is also commonly called
A.
Line-of-sight propagation
B.
Ground-wave propagation
C.
Sky-wave propagation
D.
Surface-current propagation
Correct Answer:
Line-of-sight propagation
Explanation:
Space waves generally travel along a direct line of sight between the transmitting and receiving antennas.
3. The maximum distance of space-wave communication is mainly limited by
A.
The Earth's curvature
B.
The color of the antenna
C.
The mass of the receiver
D.
The rotation speed of the antenna
Correct Answer:
The Earth's curvature
Explanation:
Because space waves travel nearly in straight lines, the curvature of the Earth limits the distance over which the antennas can see each other.
4. Which type of antenna arrangement increases the range of space-wave communication?
A.
Using lower antennas
B.
Using higher antennas
C.
Placing both antennas underground
D.
Reducing the antenna height to zero
Correct Answer:
Using higher antennas
Explanation:
Higher transmitting and receiving antennas provide a longer line-of-sight distance and therefore increase the range of space-wave propagation.
5. Space-wave propagation is most suitable for radio waves having
A.
Very low frequencies only
B.
High frequencies such as VHF and UHF
C.
Zero frequency
D.
Only audio frequencies
Correct Answer:
High frequencies such as VHF and UHF
Explanation:
Space-wave propagation is commonly used for high-frequency radio waves, including very high frequency and ultrahigh frequency waves.
6. In space-wave propagation, the receiving antenna should generally be
A.
Below the Earth's surface
B.
Within the direct line of sight of the transmitting antenna
C.
Inside the ionosphere
D.
Far below the transmitting antenna in a tunnel
Correct Answer:
Within the direct line of sight of the transmitting antenna
Explanation:
A direct line of sight between the antennas is required for effective space-wave communication.
7. Television broadcasting commonly uses space-wave propagation because television signals generally have
A.
High frequencies
B.
Extremely low frequencies
C.
No electromagnetic energy
D.
Only mechanical vibrations
Correct Answer:
High frequencies
Explanation:
Television signals use high-frequency electromagnetic waves that can propagate directly through space between suitable antennas.
8. If the height of a transmitting antenna is increased, the radio horizon for space-wave communication generally
A.
Decreases
B.
Remains exactly zero
C.
Increases
D.
Becomes independent of antenna height
Correct Answer:
Increases
Explanation:
Increasing antenna height allows the wave to reach farther before the Earth's curvature blocks the direct path, increasing the radio horizon.
9. Which communication system primarily depends on space-wave propagation?
A.
Line-of-sight television transmission
B.
Communication using only ocean currents
C.
Sound transmission through air
D.
Communication through underground water flow
Correct Answer:
Line-of-sight television transmission
Explanation:
Television transmission at high frequencies commonly uses direct, line-of-sight space waves between transmitting and receiving antennas.
10. A space wave normally reaches the receiving antenna by traveling
A.
In a nearly straight path
B.
Only along the Earth's surface
C.
Only after reflection from the ionosphere
D.
Through a wire connected to the transmitter
Correct Answer:
In a nearly straight path
Explanation:
Space waves propagate through free space along nearly straight paths, which is why direct visibility between antennas is important.
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