JEE Mains Previous Year Questions (2021-2024): Communication Systems | Physics for JEE Main & Advanced PDF Download

 Page 1


MCQ (Single Correct Answer) 
 
 
 
Q.1. The height of transmitting antenna is  1 8 0 m and the height 
of the receiving antenna is  2 4 5 m. The maximum distance 
between them for satisfactory communication in line of sight 
will be : 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
the antennas should have a minimum size equal to: 
 
Q.2. To radiate EM signal of wavelength ? with high efficiency, 
Page 2


MCQ (Single Correct Answer) 
 
 
 
Q.1. The height of transmitting antenna is  1 8 0 m and the height 
of the receiving antenna is  2 4 5 m. The maximum distance 
between them for satisfactory communication in line of sight 
will be : 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
the antennas should have a minimum size equal to: 
 
Q.2. To radiate EM signal of wavelength ? with high efficiency, 
 
 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. (D) 
Explanation 
 
Q.4. In satellite communication, the uplink frequency band used 
is : 
Page 3


MCQ (Single Correct Answer) 
 
 
 
Q.1. The height of transmitting antenna is  1 8 0 m and the height 
of the receiving antenna is  2 4 5 m. The maximum distance 
between them for satisfactory communication in line of sight 
will be : 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
the antennas should have a minimum size equal to: 
 
Q.2. To radiate EM signal of wavelength ? with high efficiency, 
 
 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. (D) 
Explanation 
 
Q.4. In satellite communication, the uplink frequency band used 
is : 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5. A transmitting antenna is kept on the surface of the earth. 
The minimum height of receiving antenna required to receive 
the signal in line of sight at  4 km distance from it is  x×10-2 m. 
The value of x is __________. 
(Let, radius of earth R=6400 km ) 
 
 
JEE Main 2023 (Online) 11th April Morning Shift 
Page 4


MCQ (Single Correct Answer) 
 
 
 
Q.1. The height of transmitting antenna is  1 8 0 m and the height 
of the receiving antenna is  2 4 5 m. The maximum distance 
between them for satisfactory communication in line of sight 
will be : 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
the antennas should have a minimum size equal to: 
 
Q.2. To radiate EM signal of wavelength ? with high efficiency, 
 
 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. (D) 
Explanation 
 
Q.4. In satellite communication, the uplink frequency band used 
is : 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5. A transmitting antenna is kept on the surface of the earth. 
The minimum height of receiving antenna required to receive 
the signal in line of sight at  4 km distance from it is  x×10-2 m. 
The value of x is __________. 
(Let, radius of earth R=6400 km ) 
 
 
JEE Main 2023 (Online) 11th April Morning Shift 
Q.6. A message signal of frequency  3 k Hz is used to modulate 
a carrier signal of frequency  1 . 5 MH z. The bandwidth of the 
amplitude modulated wave is 
 
 
JEE Main 2023 (Online) 10th 
 magni
April Evening Shift 
 
Q.7. A carrier wave of amplitude 15 V is modulated by a 
sinusoidal base band signal of tude 3 V. The ratio of 
maximum amplitude to minimum amplitude in an amplitude 
modulated wave is 
Page 5


MCQ (Single Correct Answer) 
 
 
 
Q.1. The height of transmitting antenna is  1 8 0 m and the height 
of the receiving antenna is  2 4 5 m. The maximum distance 
between them for satisfactory communication in line of sight 
will be : 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
the antennas should have a minimum size equal to: 
 
Q.2. To radiate EM signal of wavelength ? with high efficiency, 
 
 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. (D) 
Explanation 
 
Q.4. In satellite communication, the uplink frequency band used 
is : 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5. A transmitting antenna is kept on the surface of the earth. 
The minimum height of receiving antenna required to receive 
the signal in line of sight at  4 km distance from it is  x×10-2 m. 
The value of x is __________. 
(Let, radius of earth R=6400 km ) 
 
 
JEE Main 2023 (Online) 11th April Morning Shift 
Q.6. A message signal of frequency  3 k Hz is used to modulate 
a carrier signal of frequency  1 . 5 MH z. The bandwidth of the 
amplitude modulated wave is 
 
 
JEE Main 2023 (Online) 10th 
 magni
April Evening Shift 
 
Q.7. A carrier wave of amplitude 15 V is modulated by a 
sinusoidal base band signal of tude 3 V. The ratio of 
maximum amplitude to minimum amplitude in an amplitude 
modulated wave is 
JEE Main 2023 (Online) 10th April Morning Shift 
 
Q.8. The power radiated from a linear antenna of length l is 
proportional to 
(Given, ?= Wavelength of wave): 
 
 
 
JEE Main 2023 (Online) 8th April Evening Shift 
 
Q.9. A TV transmitting antenna is  98 m high and the receiving 
antenna is at the ground level. If the radius of the earth 
is  6 4 0 0 km, the surface area covered by the transmitting 
antenna is approximately: