This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
Out of Syllabus
Match List - I with List - II.

List - I

(a) 10 km height over earth's surface

(b) 70 km height over earth's surface

(c) 180 km height over earth's surface

(d) 270 km height over earth's surface

List - II

(i) Thermosphere

(ii) Mesosphere

(iii) Stratosphere

(iv) Troposphere
A
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
B
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
C
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
D
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
2
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
Out of Syllabus
A carrier signal C(t) = 25 sin(2.512 $$\times$$ 1010t) is amplitude modulated by a message signal m(t) = 5 sin(1.57 $$\times$$ 108t) and transmitted through an antenna. What will be the bandwidth of the modulated signal?
A
50 MHz
B
8 GHz
C
1987.5 MHz
D
2.01 GHz
3
JEE Main 2021 (Online) 16th March Evening Shift
+4
-1
Out of Syllabus
Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)
A
158.2 m
B
79.1 m
C
19.77 m
D
39.55 m
4
JEE Main 2021 (Online) 16th March Morning Shift
+4
-1
Out of Syllabus
A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The wavelength (in meter) of the signal transmitted by this antenna would be :
A
200
B
400
C
100
D
300
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