Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Principles of Communication/
Question 20252
JEE Physics · Medium

Principles of Communication: Amplitude Modulation MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Amplitude ModulationMediumQuestion 20252

Question

A 10 kHz audio signal AM-modulates a 1 MHz carrier. The channel bandwidth occupied is:
  1. A
    10 kHz
  2. B
    20 kHz
    Correct
  3. C
    1 MHz
  4. D
    990 kHz

Correct answer

20 kHz

Explanation

BW = 2fm = 2 × 10 kHz = 20 kHz. The signal spans from 990 kHz to 1010 kHz. AM broadcast stations are spaced 10 kHz apart (BW per station = 10 kHz, single-sideband equivalent), but full AM needs 20 kHz.

Review Principles of Communication notesStart timed chapter practice