JEE Main 2019 (Online) 10th April Morning Slot | Communication Systems Question 75 | Physics | JEE Main - ExamSIDE.Com

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1

JEE Main 2019 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

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) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A message signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage 400 V. The modulation index and difference between the two side band frequencies are :

A

0.25; 1 × 10⁸ Hz

B

4; 2 × 10⁸ Hz

C

4; 1 × 10⁸ Hz

D

0.25; 2 × 10⁸ Hz

3

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

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

4

JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

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

$${v_0}\sin {\omega _0}t + {{\rm A} \over 2}\sin ({\omega _0} - \omega )t + {A \over 2}\sin ({\omega _0} + \omega )t$$

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