NTA UGC NET/JRF Exam, June-2019 (Electronic Science)

Total Questions: 100

81. Choose the correct option from those given below:

(a) Au              (b) Ni
(c) Ag              (d) Al
Which of the following options is correct?

Correct Answer: A. (d), (c), (b), (a)

82. Some analog devices are listed below:

(a) Transistor in CE configuration
(b) Transistor in CB configuration
(c) Transistor in CC configuration
(d) OP-Amp
Select the right option about the current gain of these devices in descending order:

Correct Answer: D. (d), (c), (a), (b)

83. Arrange the following in terms of decreasing order of their propagation delay:

(a) RTL
(b) ECL
(c) TTL
(d) CMOS
The correct sequence of decreasing order of propagation delay is:

Correct Answer: C. (d), (a), (c), (b)

84. The pin signals of 8051 microcontroller are as follows:

Arrange them in ascending order of their pin numbers. Choose the correct option:

Correct Answer: A. (c), (b), (a), (d)

85. Important elements of cathode ray tube are given below:

(a) Pre-accelerating anode
(b) Accelerating anode
(c) Focusing anode
(d) Heated cathode
Correct sequence of the above elements in a CRT in the direction of electron beam is:

Correct Answer: C. (d), (a), (c), (b)

86. Assertion (A): A transmission gate is a bidirectional switch.

Reason (R): A transmission gate consists of two n-channel enhancement mode transistors.
Choose the correct answer:

Correct Answer: C. (A) is true, but (R) is false

87. Assertion (A): A code converter is a logic circuit whose inputs are bit patterns representing numbers in one code and whose outputs are the corresponding representations in a different code.

Reason (R): A sequential circuit performs this transformation by means of logic gates.
Choose the correct answer:

Correct Answer: C. (A) is true, but (R) is false

88. Assertion (A): 8086 microprocessor is a true 16-bit microprocessor.

Reason (R): It consists of two main sections, bus interface unit (BIU) and execution unit (EU).
Choose the correct answer:

Correct Answer: B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)

89. Assertion (A): In satellite communication, uplink and downlink frequencies are kept different.

Reason (R): The uplink frequency is chosen to be of lower value than the down link frequency. Choose the correct answer:

Correct Answer: C. (A) is true, but (R) is false

90. Assertion (A): If the frequencies are in microwave range, H, Y and Z parameters can not be measured.

Reason (R): Short and open circuits are difficult to achieve over a broad band of frequencies and active devices such as power transistors and tunnel diodes, frequently will not have stability for a short or open circuit.
Choose the correct answer:

Correct Answer: A. Both (A) and (R) are true and (R) is the correct explanation of (A)