physics : class12 Ground-Wave Propagation : Radio Waves : Electromagnetic Waves MCQ Questions and Answers
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Ground-Wave Propagation
MCQ questions and answers.
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MCQ Questions
1. In ground-wave propagation, radio waves travel mainly along the surface of the
A.
Earth
B.
Moon
C.
Sun
D.
Ionosphere
Correct Answer:
Earth
Explanation:
Ground waves propagate along and near the surface of the Earth.
2. Ground-wave propagation is especially useful for communication over distances that are
A.
Beyond the horizon only
B.
Short and moderate
C.
Only between satellites
D.
Only through outer space
Correct Answer:
Short and moderate
Explanation:
Ground waves can follow the Earth's surface and are commonly used for short- and moderate-distance communication.
3. A ground wave can reach a location beyond the line of sight because it
A.
Follows the curvature of the Earth
B.
Travels only in a straight line
C.
Reflects from the Moon
D.
Stops at the horizon
Correct Answer:
Follows the curvature of the Earth
Explanation:
Ground waves bend or follow the Earth's surface, allowing them to reach somewhat beyond the line of sight.
4. Which property of the ground generally helps a ground wave travel farther?
A.
High electrical conductivity
B.
Very low conductivity
C.
Complete absence of soil
D.
Zero atmospheric pressure
Correct Answer:
High electrical conductivity
Explanation:
Conductive ground, such as seawater, causes less attenuation of ground waves and allows greater range.
5. Ground-wave signals are attenuated mainly because energy is
A.
Absorbed by the ground
B.
Created by the ground
C.
Reflected only by stars
D.
Converted entirely into light
Correct Answer:
Absorbed by the ground
Explanation:
As a ground wave travels along the Earth's surface, part of its energy is absorbed by the ground, reducing its strength.
6. Which type of terrain usually provides better ground-wave propagation?
A.
Wet, conducting ground
B.
Dry sand only
C.
Insulating plastic sheets
D.
A vacuum region
Correct Answer:
Wet, conducting ground
Explanation:
Wet ground has higher conductivity, so it absorbs less ground-wave energy than dry or poorly conducting surfaces.
7. Compared with a dry desert, seawater generally allows a ground wave to travel
A.
A greater distance
B.
A shorter distance
C.
No distance at all
D.
Only vertically upward
Correct Answer:
A greater distance
Explanation:
Seawater is highly conducting, which reduces attenuation and increases the range of ground-wave propagation.
8. Ground-wave propagation is most commonly associated with radio frequencies that are
A.
Low and medium
B.
Only visible-light frequencies
C.
Only X-ray frequencies
D.
Only extremely high microwave frequencies
Correct Answer:
Low and medium
Explanation:
Ground-wave propagation is effective mainly at low and medium radio frequencies, where the wave can travel along the Earth's surface.
9. As the distance from a ground-wave transmitter increases, the signal strength generally
A.
Decreases
B.
Increases without limit
C.
Remains exactly constant
D.
Becomes independent of the ground
Correct Answer:
Decreases
Explanation:
Ground-wave strength decreases with distance because of spreading and absorption by the Earth's surface.
10. Which broadcasting service commonly uses ground-wave propagation for local coverage?
A.
AM radio broadcasting
B.
Deep-space laser communication
C.
X-ray astronomy
D.
Satellite television only
Correct Answer:
AM radio broadcasting
Explanation:
AM radio signals, particularly in the low- and medium-frequency ranges, commonly use ground-wave propagation for local and regional coverage.
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