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Radio Waves are MCQ. We covered all the Radio Waves are MCQ in this post for free so that you can practice well for the exam.
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MCQ on Radio Waves for NEET Students
Which of the following can generate a propagating electromagnetic wave?
(a) A neutral particle
(b) A charge undergoing acceleration
(c) A charge moving with constant speed
(d) A static charge
Option b – A charge undergoing acceleration
A transmission antenna is placed 40 m high, and a reception antenna is 60 m tall. Assuming Earth’s radius is 6400 km, what is the greatest possible distance for line-of-sight communication?
(a) 30.5 km
(b) 50 km
(c) 69.3 km
(d) 80 km
Option b – 50 km
An electromagnetic wave is traveling westward. If its electric field vector points upward, where does the magnetic field vector point?
(a) Downward
(b) North
(c) South
(d) West
Option b – North
Which type of radiation is affected by an electric field?
(a) X-rays
(b) Gamma rays
(c) Cathode rays
(d) Ultraviolet rays
Option c – Cathode rays
Given two sideband frequencies are 1.01 MHz and 990 kHz, what are the carrier and modulating frequencies?
(a) 10 MHz and 900 kHz
(b) 1 MHz and 10 kHz
(c) 10 MHz and 1 MHz
(d) 0.1 MHz and 1 kHz
Option b – 1 MHz and 10 kHz
Why are metal utensils unsuitable for use in microwave ovens?
(a) They conduct heat well but don’t heat via microwaves
(b) They may melt due to their low melting point
(c) There’s a risk of electric shock from charge accumulation
(d) All the above reasons
Option c – There’s a risk of electric shock from charge accumulation
If E and B are the electric and magnetic fields in an electromagnetic wave, in which direction does the wave move?
(a) In the direction of E
(b) Along B
(c) In the direction of E × B
(d) In the direction of B × E
Option c – In the direction of E × B
Which factor does not affect the skip distance in radio communication?
(a) Altitude of the reflecting atmospheric layer
(b) Wave’s angle of incidence on that layer
(c) The layer’s critical frequency
(d) None of the above
Option d – None of the above
Why can’t infrasonic waves move through a vacuum?
(a) They do not travel in straight lines
(b) They are not transverse
(c) They aren’t electromagnetic waves
(d) All of these reasons
Option c – They aren’t electromagnetic waves
The shape of the signal waveform is irrelevant in which case?
(a) Analog signals
(b) Digital signals
(c) Communication signals
(d) All of the above
Option b – Digital signals
Assertion: Communication signals are termed baseband signals.
Reason: These signals typically correspond to a specific frequency.
(a) Both are true, and the reason correctly explains the assertion
(b) Both are true, but the reason does not explain the assertion
(c) Assertion is true; reason is false
(d) Both are false
Option c – Assertion is true; reason is false
If solar radiation has an average energy density of 4.6 μJ/m³, what is the RMS value of the electric field?
(a) 438 N/C
(b) 598 N/C
(c) 660 N/C
(d) 721 N/C
Option d – 721 N/C
Ultraviolet rays are commonly used for sterilization in:
(a) Chemotherapy
(b) Swimming pool maintenance
(c) Vitamin D production
(d) All of the above
Option b – Swimming pool maintenance
Signal transmission is ideally done in which frequency range?
(a) Audio frequencies
(b) Low frequencies
(c) High frequencies
(d) Electromagnetic spectrum
Option c – High frequencies
The shortest wavelength X-rays emitted by an X-ray tube depends upon:
(a) Type of gas inside the tube
(b) Target material in the tube
(c) Applied voltage
(d) All of the above
Option c – Applied voltage
What is the minimum antenna length required to transmit a radio signal of 8.5 MHz frequency?
(a) 16.4 m
(b) 12.1 m
(c) 8.8 m
(d) 7.5 m
Option c – 8.8 m
A diode detector with a 100 pF capacitor and 250 kΩ load resistor is used for amplitude detection. What is the maximum frequency that can be detected if the modulation is 60%?
(a) 10.62 MHz
(b) 10.62 kHz
(c) 5.31 MHz
(d) 5.31 kHz
Option b – 10.62 kHz
Devices such as microphones, photodetectors, and speakers fall under which category?
(a) Amplifiers
(b) Attenuators
(c) Transducers
(d) Modulators
Option c – Transducers
A parallel plate capacitor has two circular plates with a radius of 15 cm and separation of 5 mm. To establish a displacement current of 2 mA, what rate of voltage change is required?
(a) 16 MV/s
(b) 1.9 MV/s
(c) 16 V/s
(d) 2.7 V/s
Option a – 16 MV/s
Assertion: The Earth’s atmosphere supports EM wave propagation up to 40 MHz.
Reason: The ionosphere contains the Appleton layer.
(a) Both are true; reason explains assertion
(b) Both are true; reason does not explain assertion
(c) Assertion is true; reason is false
(d) Both are false
Option b – Both are true; reason does not explain assertion
Among UV A, UV B, and UV C, which has the highest frequency and poses the most harm to cells?
(a) UV A
(b) UV B
(c) UV C
(d) All have the same frequency
Option c – UV C
Which of the following is not used in communication systems?
(a) Radio waves
(b) Microwaves
(c) Infrared rays
(d) Ultraviolet rays
Option d – Ultraviolet rays
Which channel is used for satellite communication?
(a) Optical fiber
(b) Free space
(c) Transmission line
(d) Light pulse
Option b – Free space
When one modem communicates with another, the signal used is:
(a) Analog
(b) Digital
(c) Unmodulated
(d) Any of the above
Option a – Analog
Ground wave propagation is suitable for:
(a) High-frequency short-distance transmission
(b) High-frequency long-distance transmission
(c) Medium frequency over long distances
(d) Medium frequency over short distances
Option d – Medium frequency over short distances
When a capacitor is connected to an AC source and the frequency increases, the displacement current:
(a) Increases
(b) Decreases
(c) Remains unchanged
(d) Equals the conduction current
Option a – Increases
In a communication system, the required channel depends on which property of the signal?
(a) Phase
(b) Amplitude
(c) Power
(d) Bandwidth
Option d – Bandwidth
When EM waves enter the ionosphere, what happens to the layer’s relative permittivity?
(a) Remains unchanged
(b) Seems to increase
(c) Appears to decrease
(d) Varies randomly
Option c – Appears to decrease
What distinguishes a repeater from a transmitter?
ii. A repeater can serve as a transmitter, but not vice versa
iii. The number of repeaters is generally more than transmitters
(a) i and iii
(b) ii and iii
(c) i and iv
(d) ii and iv
Option b – ii and iii
What is the gain of a 1-meter parabolic antenna transmitting waves of 0.02 m wavelength?
(a) 9800
(b) 15000
(c) 10000
(d) 100
Option b – 15000
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