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Friday, 9 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 25 July 2021, Shift 1, Physics Q4

Question 4 of 90 in this shift, Physics question 4 of 30, Section A.

In Amplitude Modulation, the message signal Vm(t)=10sin⁡(2π×105t)V_m(t)=10\sin(2\pi\times10^5t) volts and Carrier signal Vc(t)=20sin⁡(2π×107t)V_c(t)=20\sin(2\pi\times10^7t) volts The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is α\alpha kHz. The value of α\alpha is :
  1. (1)200 kHzOfficial answer
  2. (2)100 kHz
  3. (3)50 kHz
  4. (4)0

Official answer

Option 1

NTA final key.

Chapter
Communication Systems
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.