JEE-MAIN SERIES Physics
Wave Characteristics
9 previous year questions.
Volume: 9 Ques
Yield: Medium
High-Yield Trend
3
2024 1
2023 5
2022 Chapter Questions 9 MCQs
01
PYQ 2022
medium
physics ID: jee-main
Choose the correct statement for amplitude modulation :
1
Amplitude of modulating signal is varied in accordance with the information signal.
2
Amplitude of modulated signal is varied in accordance with the information signal.
3
Amplitude of carrier signal is varied in accordance with the information signal.
4
Amplitude of modulated signal is varied in accordance with the modulating signal.
02
PYQ 2022
medium
physics ID: jee-main
Amplitude modulated wave is represented by VAM = 10[1+0.4cos(2\pi \times 104t] cos(2\pi \times 107t). The total bandwidth of the amplitude modulated wave is:
1
10 kHz
2
20 MHz
3
20 kHz
4
10 MHz
03
PYQ 2022
medium
physics ID: jee-main
An antenna is placed in a dielectric medium of dielectric constant . If the maximum size of that antenna is , it can radiate a signal of minimum frequency of __________GHz. (Given = for dielectric medium)
04
PYQ 2022
medium
physics ID: jee-main
If a wave gets refracted into a denser medium, then which of the following is true?
1
Wavelength, speed and frequency decreases
2
Wavelength increases, speed decreases and frequency remains constant
3
Wavelength and speed decreases but frequency remains constant
4
wavelength, speed and frequency increases
05
PYQ 2022
medium
physics ID: jee-main
We do not transmit low frequency signal to long distance because-
(a) The size of the antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength
(b) Effective power radiated by a long wavelength baseband signal would be high
(c) We want to avoid mixing up signals transmitted by different transmitter simultaneously
(d) Low frequency signal can be sent to long distances by superimposing with a high frequency wave as well
Therefore, the most suitable option will be
(a) The size of the antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength
(b) Effective power radiated by a long wavelength baseband signal would be high
(c) We want to avoid mixing up signals transmitted by different transmitter simultaneously
(d) Low frequency signal can be sent to long distances by superimposing with a high frequency wave as well
Therefore, the most suitable option will be
1
All statements are true
2
(a), (b) and (c) are true only
3
(a), (c) and (d) are true only
4
(b), (c) and (d) are true only
06
PYQ 2023
easy
physics ID: jee-main
In an amplitude modulation, a modulating signal having amplitude of is superimposed with a carrier signal of amplitude in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude . The ratio of modulation index in the two cases respectively will be :
1
2
3
4
07
PYQ 2024
medium
physics ID: jee-main
The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:
1
215 nm
2
400 nm
3
414 nm
4
200 nm
08
PYQ 2024
hard
physics ID: jee-main
In single electron , first member of Lyman series is , then wavelength of second member of their series shall be
1
2
3
4
09
PYQ 2024
hard
physics ID: jee-main
Stopping potential is if wavelength of incident light is and it is for . Find threshold wavelength.
