250+ TOP MCQs on Noise – 1 & Answers

Digital Communications Multiple Choice Questions on “Noise”.

1. SQNR can be improved by _______ sampling rate.
A. Increasing
B. Decreasing
C. Does not depend
D. None of the mentioned
Answer: A
Clarification: SQNR can be improved by increasing the sampling rate.

2. Which offers better SQNR?
A. Delta modulation
B. PCM
C. Delta modulation & PCM
D. None of the mentioned
Answer: B
Clarification: PCM offers better SQNR than delta modulation.

3. Two functions are called as orthogonal if on integrating the product we get
A. One
B. Zero
C. Infinity
D. None of the mentioned
Answer: B
Clarification: Two functions are called as orthogonal if the integral value of integrating the product is zero.

4. Eigen functions are not orthogonal.
A. True
B. False
Answer: B
Clarification: An important property of eigen function is that they are orthogonal.

5. Shot noise is produced by
A. Electrons
B. Photons
C. Electrons & Photons
D. None of the mentioned
Answer: C
Clarification: Shot noise occurs due to particle like the behaviour of electron and photon.

6. Shot noise is avoidable when current is
A. Zero
B. One
C. Infinity
D. None of the mentioned
Answer: A
Clarification: Shot noise is avoidable only when the current is zero.

7. Shot noise is
A. Stochastic process
B. Poisson process
C. Stochastic & Poisson process
D. None of the mentioned
Answer: B
Clarification: Shot noise is a Poisson process.

8. Which occurs due to equilibrium fluctuations?
A. Thermal noise
B. Johnson noise
C. Thermal & Johnson noise
D. None of the mentioned