Questions and answers for exam Preparation

MCQs

Total Questions : 67 | Page 5 of 7 pages

Question 41. Statement: There were different streams of freedom movements in colonial India carried out by the
moderates, liberals, radicals, socialists, and so on. Which one of the following is the best inference from the above statement?

The emergence of nationalism in colonial India led to our Independence.
Nationalism in India emerged in the context of colonialism.
Nationalism in India is homogeneous.
Nationalism in India is heterogeneous.

Discuss Question

Answer: Option D. -> Nationalism in India is heterogeneous.

-NA-

Question 42. Find the sum to n terms of the series 10+84+ 734 + .....

9(9n + 1)/10 + 1
9(9n - 1)/8 + 1
9(9n - 1)/8 + n
9(9n - 1)/8 + n2

Discuss Question

Answer: Option D. -> 9(9n - 1)/8 + n2

-NA-

Question 43. A car travels 8 km in the first quarter of an hour, 6 km in the second quarter and 16 km in the third
quarter. The average speed of the car in km per hour over the entire journey is

Discuss Question

Answer: Option C. -> 40

-NA-

Question 44. A band-limited signal with a maximum frequency of 5 kHz is to be sampled. According to the sampling theorem, the sampling frequency which is not valid is

5 kHz
12 kHz
15 kHz
20 kHz

Discuss Question

Answer: Option A. -> 5 kHz

-NA-

Question 45. In a MOSFET operating in the saturation region, the channel length modulation effect causes

an increase in the gate-source capacitance
a decrease in the transconductance
a decrease in the unity-gain cutoff frequency
a decrease in the output resistance

Discuss Question

Answer: Option D. -> a decrease in the output resistance

-NA-

Question 46. Which one of the following statements is NOT TRUE for a continuous time causal and stable LTI system?

All the poles of the system must lie on the left side of the jÏ‰ axis.
Zeros of the system can lie anywhere in the s-plane.
All the poles must lie within |s| =1.
All the roots of the characteristic equation must be located on the left side of the jÏ‰ axis.

Discuss Question

Answer: Option C. -> All the poles must lie within |s| =1.

-NA-

Question 47. A polynomial f(x) = a4 x4 + a3 x3 + a2 x2 + a1 x - a0 with all coefficients positive has

no real roots
no negative real root
odd number of real roots
at least one positive and one negative real root

Discuss Question

Answer: Option D. -> at least one positive and one negative real root

-NA-

Question 48. Let g(t) = e-Ï€t2, and h(t ) is a filter matched to g (t ) . If g (t ) is applied as input to h(t ) , then the Fourier transform of the output is

e-Ï€f2
e-Ï€f2/2
e-Ï€|f|
e-2Ï€f2

Discuss Question

Answer: Option D. -> e-2Ï€f2

-NA-

Question 49. The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coefficient are respectively

1.22 and 0.1
0.81 and 0.1
-1.22 and 0.1
2.44 and 0.2

Discuss Question

Answer: Option A. -> 1.22 and 0.1

-NA-

Question 50. A source vs(t) = V cos Ï€t has an internal impedance of (4 + j3)â„¦ . If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in â„¦ should be

Discuss Question

Answer: Option C. -> 5

-NA-