physics : class12 Radio Wave Polarization : Radio Waves : Electromagnetic Waves MCQ Questions and Answers
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Radio Wave Polarization
MCQ questions and answers.
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MCQ Questions
1. What does the polarization of a radio wave describe?
A.
The direction of oscillation of its electric field
B.
The speed of its propagation only
C.
The temperature of the transmitting antenna
D.
The distance between the transmitter and receiver
Correct Answer:
The direction of oscillation of its electric field
Explanation:
Polarization describes the direction in which the electric field of the radio wave oscillates.
2. A radio wave whose electric field remains in one fixed direction is said to be what type of polarized wave?
A.
Circularly polarized
B.
Linearly polarized
C.
Randomly polarized
D.
Unpolarized only
Correct Answer:
Linearly polarized
Explanation:
In linear polarization, the electric field oscillates along one fixed direction perpendicular to the direction of propagation.
3. In an electromagnetic radio wave, the polarization is determined by the direction of the:
A.
Electric field
B.
Wave speed
C.
Frequency only
D.
Wavelength only
Correct Answer:
Electric field
Explanation:
The polarization of an electromagnetic wave is defined by the direction and behavior of its electric field.
4. For maximum reception, the receiving antenna for a linearly polarized radio wave should generally be:
A.
Parallel to the electric-field direction
B.
Perpendicular to the electric-field direction
C.
Placed parallel to the direction of propagation
D.
Kept at any angle with no effect
Correct Answer:
Parallel to the electric-field direction
Explanation:
A receiving antenna responds most effectively when it is aligned with the electric field of the linearly polarized radio wave.
5. What happens when a linearly polarized radio wave reaches a receiving antenna placed perpendicular to its polarization direction?
A.
The received signal is maximum
B.
The received signal is greatly reduced or ideally zero
C.
The frequency becomes zero
D.
The wave changes into a sound wave immediately
Correct Answer:
The received signal is greatly reduced or ideally zero
Explanation:
An antenna perpendicular to the electric-field direction cannot effectively respond to the wave, so the received signal is minimized.
6. Which type of radio-wave polarization has the electric-field direction rotating as the wave travels?
A.
Linear polarization
B.
Circular polarization
C.
Static polarization
D.
Zero polarization
Correct Answer:
Circular polarization
Explanation:
In circular polarization, the electric-field vector rotates with time while maintaining a constant magnitude.
7. A vertically oriented transmitting antenna commonly produces a radio wave with which polarization?
A.
Vertical polarization
B.
Horizontal polarization
C.
Circular polarization only
D.
No polarization
Correct Answer:
Vertical polarization
Explanation:
The electric field is commonly oriented vertically when a straight transmitting antenna is placed vertically, giving vertical polarization.
8. A horizontally oriented transmitting antenna commonly produces a radio wave with which polarization?
A.
Vertical polarization
B.
Horizontal polarization
C.
Circular polarization only
D.
Random polarization only
Correct Answer:
Horizontal polarization
Explanation:
A horizontal transmitting antenna commonly produces an electric field that oscillates horizontally, resulting in horizontal polarization.
9. If the electric field of a radio wave oscillates in the vertical direction, the wave is called:
A.
Horizontally polarized
B.
Vertically polarized
C.
Unpolarized
D.
Circularly polarized
Correct Answer:
Vertically polarized
Explanation:
The polarization name indicates the direction of the electric-field oscillation; a vertical electric field gives vertical polarization.
10. Which statement about the polarization of a radio wave is correct?
A.
It is related to the direction of the magnetic field only
B.
It is related to the direction of the electric field oscillation
C.
It is determined only by the wave's amplitude
D.
It is independent of the orientation of the transmitting antenna
Correct Answer:
It is related to the direction of the electric field oscillation
Explanation:
Radio-wave polarization is defined by the orientation and motion of the electric field, which is influenced by the transmitting antenna.
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