# Noise in FM MCQ’s

This set of Analog Communication Multiple Choice Questions & Answers (MCQs) focuses on “Noise in FM”.

1. What is the spectral density of white noise?

a) varies with bandwidth

b) varies with frequency

c) constant

d) infinite

2. Which is the true statement about noise performance of wideband FM system?

a) it is independent of modulation index

b) more prone to noise interference

c) it is independent of signal to noise ratio

d) it exhibits a threshold

3. What is the probability density function of thermal noise?

a) Poisson

b) Gaussian

c) Binomial

d) Bessel

4. What is the power ratio of one decibel?

a) 2:1

b) 1.26:1

c) 3:1

d) 2.5:1

5. What is the maximum possible value of entropy?

a) 1

b) ∞

c) 100

d) 50

6. Bit is a unit of ________

a) Channel Capacity

b) Entropy

c) Information

d) Rate of information

7. What is the auto correction function of white noise?

a) Impulse Function

b) Step Function

c) Ramp Function

d) Parabolic Function

8. If we double the value of resistor then how it affects the thermal noise power?

a) gets doubled

b) gets halved

c) gets quadrupled

d) remains unchanged

9. Pick the odd one out.

a) Cosmic noise

b) Galactic noise

c) Atmospheric noise

d) Polar noise

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