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
Out of the following options which one can be used to produce a propagating electromagnetic wave?
(A) A chargeless particle.
(B) An accelerating charge.
(C) A charge moving at constant velocity.
(D) A stationary charge.
Option b – An accelerating charge.
A transmitting antenna at the top of a tower has a height of 40 m and that of the receiving antenna is 60 m. What is the maximum distance between them for satisfactory communication in line-of-sight mode? (Take the radius of the earth as 6400 km)
(A) 30.5 km
(B) 50 km
(C) 69.3 km
(D) 80 km
Option b – 50 km
An electromagnetic wave propagating along the west has an electric field vector upwards then its magnetic field vector points towards ……….
(A) downward
(B) north
(C) south
(D) west
Option b – north
Which of the following will deflect in an electric field?
(A) X-rays
(B) Gamma rays
(C) Cathode rays
(D) Ultraviolet rays
Option c – Cathode rays
If two sideband frequencies are 1.01 MHz and 990 kHz, carrier wave and amplitude wave frequencies are respectively
(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.
Metal containers should not be used in microwaves because
(A) metals are thermally good conductors but cannot be heated using microwaves.
(B) due to low melting points, metals may melt.
(C) metal containers arise the danger of electric shock from accumulated electric charges.
(D) all of the above.
Option c – metal containers arise the danger of electric shock from accumulated electric charges.
If E and B represent electric and magnetic field vectors of the electromagnetic wave respectively, the direction of propagation of the electromagnetic wave is along
(A) E
(B) B
(C) E X B
(D) B X E
Option c – E X B
Skip distance is independent of ……….
(A) height of the reflecting layer of the atmosphere
(B) the angle of incidence of wave on the reflecting layer of the atmosphere
(C) the critical frequency of the reflecting layer of the atmosphere
(D) none of the above.
Option d – none of the above.
Infrasonic waves cannot travel in a vacuum because
(A) they do not exhibit rectilinear propagation.
(B) they are not transverse waves.
(C) they are not electromagnetic waves.
(D) all of the above.
Option c – they are not electromagnetic waves.
The shape of the pulse/signal does not matter in the case of ………..
(A) analog signal
(B) digital signal
(C) communication signal
(D) all of the above
Option b – digital signal
Assertion: Communication signals are called baseband signals. Reason: Communication signal usually maps to a unique frequency.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is False.
Option c – The assertion is True, Reason is False.
If the average total energy density of solar radiation is 4.6 µJ/m³ then what will be the RMS value of an electric field of sunlight?
(A) 438 N/C
(B) 598 N/C
(C) 660 N/C
(D) 721 N/C
Option d – 721 N/C
The property that UV rays are germicidal is used in ………..
(A) chemotherapy
(B) swimming pool technology
(C) synthesis of vitamin D
(D) all of the above
Option b – swimming pool technology
For practical purposes, the transmission of electrical signals is preferred over ……… range.
(A) audio frequency
(B) low frequency
(C) high frequency
(D) electromagnetic
Option c – high frequency
The shortest wavelength of X-rays emitted from an X-ray tube depends upon
(A) the nature of the gas in the tube.
(B) nature of the target of the tube.
(C) the voltage applied to the tube.
(D) all of the above.
Option c – the voltage applied to the tube.
The minimum length of antenna required to transmit a radio signal of frequency 8.5 MHz is a
(A) 16.4 m
(B) 12.1 m
(C) 8.8 m
(D) 7.5 m
Option c – 8.8 m
A diode detector is used to detect an amplitude-modulated wave of 60% modulation by using a condenser of capacity 100 pico-farads in parallel with a load resistance of 250-kilo ohm. Find the maximum modulated frequency which could be detected by it.
(A) 10.62 MHz
(B) 10.62 kHz
(C) 5.31 MHz
(D) 5.31 kHz
Option b – 10.62 kHz
A microphone, a photodetector, and a speaker are examples of ………
(A) amplifier
(B) attenuator
(C) transducer
(D) modulator
Option c – transducer
A parallel plate capacitor consists of two circular plates each of radius 15 cm and separated by 5 mm. In order to establish an instantaneous displacement current of 2 mA in space between the plates of a capacitor, the potential difference that needs to be applied is
(A) 16 MV/s
(B) 1.9 MV/s
(C) 16 V/s
(D) 2.7 V/s
Option a – 16 MV/s
Assertion: Earth’s atmosphere helps in the propagation of electromagnetic waves up to 40 MHz frequency. Reason: Ionosphere has an Appleton layer.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is False.
Option b – The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
Three main types of UV radiation are categorized as UV A, UV B, and UV C. Considering the damage to cells and sunburn, UV C is the most dangerous followed by UV B and UV A. Which out of the three would have the highest frequency?
(A) UV A
(B) UV B
(C) UV C
(D) All have the same frequency.
Option c – UV C
Which of the radiation is not used for communication?
(A) Radio waves
(B) Microwaves
(C) Infrared waves
(D) Ultraviolet radiation.
Option d – Ultraviolet radiation.
For satellite communication, the channel used is ………
(A) optical fiber
(B) free space
(C) transmission line
(D) optic pulse
Option b – free space
When modem I communicate to modem II, ( Radio Waves are MCQ )
(A) it is through analog signals.
(B) it is through digital signals.
(C) it is through unmodulated signals.
(D) any of the above.
Option a – it is through analog signals.
Ground wave propagation is useful for ( Radio Waves are MCQ )
(A) high-frequency bands over short-range distances.
(B) high-frequency band over long-range distances.
(C) medium frequency band over long-range distance.
(D) medium frequency band over short-range distance.
Option d – medium frequency band over short-range distance.
An ac source of variable frequency is connected to a capacitor. If the frequency of the source is increased, the displacement current will
(A) increase.
(B) decrease.
(C) remain unchanged.
(D) become equal to the conduction current.
Option a – increase.
In a communication system, the type of communication channel needed for a given signal depends on ………
(A) phase
(B) amplitude
(C) power
(D) bandwidth
Option d – bandwidth
When electromagnetic waves enter the ionized layer of the ionosphere, then the relative permittivity of the ionized layer ……..
(A) does not change
(B) appears to increase
(C) appears to decrease
(D) changes randomly
Option c – appears to decrease
The difference between a repeater and a transmitter is that i. transmitter can act as a repeater but the converse is not true. ii. the repeater can act as a transmitter but the converse is not true. iii. a number of repeaters are more than the number of transmitters. iv. a number of transmitters are more than the number of repeaters.
(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 m paraboloid antenna using the signal of wavelength 0.02 m?
(A) 9800
(B) 15000
(C) 10000
(D) 100
Option b – 15000
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