NTA UGC NET/JRF Exam, June -2020 (Electronic Science)

Total Questions: 100

81. Arrange the following addresses in ascending order of their priority:

(a) Address for divide error is 0000H
(b) Address for one-byte interrupt instruction, INT is 000CH
(c) Address for overflow, INTO instruction is 0010H
(d) Address for single step trap - TF must be set is 0004H
(e) Address for non maskable interrupt is 0008H
Choose the correct answer from the options given below:

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

82. Following materials are given:

(a) Nickel
(b) Silicon iron
(c) Silver
(d) Cobalt
Arrange them in ascending order of relative permeability.
Choose the correct answer from the options given below:

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

83. Arrange the bandwidth efficiency of the following M-ary modulation schemes in descending order:

(a) 8-ary PSK
(b) 8-ary FSK
(c) 16-ary FSK
(d) 16-ary PSK
(e) 4-ary FSK
Choose the correct answer from the options given below:

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

84. For a unity feedback system, open loop, gain is a complex quantity (x + jy) and M circles are drawn for different values of 'M':

(a) M = 1                              (b) M = 2
(c) M = 3                              (d) M = 1.6
Arrange the above in ascending order of radius for constant magnitude Loci.
Choose the correct answer from the options given below:

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

85. Arrange the following in their order of occurance from control grid to fluorescent screen:

(a) Focusing Anode
(b) Horizontal Deflection Plates
(c) Aquadag
(d) Pre-accelerating anode
(e) Vertical deflection plates
Choose the correct answer from the options given below:

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

86. Statement I: For memory capacitors, one of the popular structure is trench capacitor to push memory densities to 64 M bits and beyond..

Statement II : The sides of the trench capacitor are doped n⁺ and the bottom of the trench has a p⁺ region, that forms a channel - stop region to isolate adjacent capacitors.
In the light of the above statements, choose the correct answer from the options given below:

Correct Answer: A. Both Statement I and Statement II are true

87. Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A): The circuits that are quite stable and relatively insensitive to temperature variations have high stability factors.
Reasons (R): For a particular configuration, if a change in I𝔠ₒ fails to produce a significant change in I𝔠 the stability factor will be quite small. B. Both Statement I and Statement II are incorrect C. Statement I is correct, but Statement II is incorrect D. Statement I is incorrect, but Statement II is correct

In the light of the above statement, choose the correct answer from the options given below:

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

88. Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A): In Gunn effect, when electric field is varied from zero to a threshold value. The drift velocity decreases.
Reasons (R): Beyond the threshold electric field, if the electric field is increased, the drift velocity is decreased and the diode exhibits negative resistance.
In the light of the above statement, choose the most appropriate answer from the options given below:

Correct Answer: D. (A) is not correct, but (R) is correct

89. Give below are two statements:

Statement I: The Hall effect sensor is included in the magnetic core structure of the current probe.
Statement II: The Hall effect sensor assures that the static magnetic flux in the core is exactly zero.
In the light of the above statements, choose the most appropriate answer from the options given below

Correct Answer: A. Both Statement I and Statement II are correct

90. Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A): The Syndrome depends on both the error pattern and the transmitted code word.
Reasons (R): All error patterns that differ by a code word have the same syndrome.
In the light of the above statements, choose the correct answer from the options given below:

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