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1
JEE Main 2022 (Online) 25th June Morning Shift
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A signal of 100 THz frequency can be transmitted with maximum efficiency by :

A
Coaxial cable
B
Optical fibre
C
Twisted pair of copper wires
D
Water
2
JEE Main 2022 (Online) 24th June Morning Shift
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A baseband signal of 3.5 MHz frequency is modulated with a carrier signal of 3.5 GHz frequency using amplitude modulation method. What should be the minimum size of antenna required to transmit the modulated signal?

A
42.8 m
B
42.8 mm
C
21.4 mm
D
21.4 m
3
JEE Main 2021 (Online) 27th August Evening Shift
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An antenna is mounted on a 400 m tall building. What will be the wavelength of signal that can be radiated effectively by the transmission tower upto a range of 44 km?
A
37.8 m
B
605 m
C
75.6 m
D
302 m
4
JEE Main 2021 (Online) 26th August Evening Shift
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A transmitting antenna at top of a tower has a height of 50 m and the height of receiving antenna is 80 m. What is range of communication for Line of Sight (LoS) mode?

[use radius of earth = 6400 km]
A
45.5 km
B
80.2 km
C
144.1 km
D
57.28 km
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