This chapter is currently out of syllabus
1
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Given below in the the left column are different modes of communication using the kinds of waves given the right column.
A Optical Fibre
communication
P Ultrasound
B Radar Q Infrared Light
C Sonar R Microwaves
D Mobile Phones S Radio Waves
A
A-Q, B-S, C-R, D-P
B
A-Q, B-S, C-P, D-R
C
A-S, B-Q, C-R, D-P
D
A-R, B-P, C-S, D-Q
2
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The physical sizes of the transmitter and receiver antenna in a communication system are :-
A
proportional to carrier frequency
B
inversely proportional to carrier frequency
C
inversely proportional to modulation frequency
D
independent of both carrier and modulation frequency
3
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A signal Acoswt is transmitted using v0 sin $$\omega $$0t as carrier wave. The correct amplitude modulated (AM) signal is
A
v0 sin $$\omega $$0t + Acos$$\omega $$t
B
(v0 + A)cos$$\omega $$t sin$$\omega $$0 t
C
v0 sin[$$\omega $$0 (1+ 0.01Asin$$\omega $$t)t]
D
$${v_0}\sin {\omega _0}t + {{\rm A} \over 2}\sin ({\omega _0} - \omega )t + {A \over 2}\sin ({\omega _0} + \omega )t$$
4
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving antennas. If the height of the receiving antenna is 70m, then the minimum height of the transmitting antenna should be :
(Radius of the Earth = 6.4 × 106 m).
A
40 m
B
20 m
C
51 m
D
32 m
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