D. C. Pandey Solutions for Chapter: Basics of Communications, Exercise 23: Objective Problems [Level 2]

Author:D. C. Pandey

D. C. Pandey Physics Solutions for Exercise - D. C. Pandey Solutions for Chapter: Basics of Communications, Exercise 23: Objective Problems [Level 2]

Attempt the free practice questions on Chapter 11: Basics of Communications, Exercise 23: Objective Problems [Level 2] with hints and solutions to strengthen your understanding. Complete Study Pack for Engineering Entrances Objective Physics Vol 2 solutions are prepared by Experienced Embibe Experts.

Questions from D. C. Pandey Solutions for Chapter: Basics of Communications, Exercise 23: Objective Problems [Level 2] with Hints & Solutions

EASY
JEE Advanced
IMPORTANT

A radar has a power of 1 kW and is operating at a frequency of 10 GHz. It is located on a mountain top of height 500 m. The maximum distance up to which it can detect object located on the surface of the earth (radius of the earth=6.4×106 m) is,

MEDIUM
JEE Advanced
IMPORTANT

Which of the following four alternatives is not correct? We need modulation,

EASY
JEE Advanced
IMPORTANT

This question has Statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two statements.

Statement I: Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals.

Statement II: The state of ionosphere varies from hour to hour, day to day and season to season.

EASY
JEE Advanced
IMPORTANT

If Ec=20sin105πt and Em=10sin400πt  are carrier and modulating signals respectively, the modulation index is

EASY
JEE Advanced
IMPORTANT

1000kHz carrier wave is amplitude modulated by the signal frequency 200 Hz-4000 Hz. The channel width of this case is

EASY
JEE Advanced
IMPORTANT

The distance of coverage of a transmitting antenna is 12.8 km. Then, the height of the antenna is (given that radius of the earth=6400 km),

EASY
JEE Advanced
IMPORTANT

Which one of the following is incorrect statement in the transmission of electromagnetic waves?