📣 Paper 3 has been removed from NET from 2018 (Notification)- now paper 2 and 3 syllabus is included in paper 2. Practice both paper 2 and 3 from past papers.

NTA NET UGC Electronic Science Higher Questions KC Past Year 2013 Part 1

Online Paper 1 complete video lectures with Dr. Manishika Jain. Join now!

Section 3

Q-1 Semiconductor materials are made up of

Options:-

(1) Metallic bond

(2) Ionic bond

(3) Vander Waal՚s bond

(4) Covalent bond

Q-2 A UJT has

(1) Negative resistance characteristics

(2) Low firing current

(3) Bipolar device

(4) Relax indefinitely

Q-3. The current in a Zener diode is controlled by

(1) Zener diode resistance

(2) Potential barrier

(3) Impact ionization

(4) External circuits resistance

Q-4 The ripple factor of a half-wave rectifier is found to be

(1) 1.57

(2) 1.21

(3) 1.12

(4) 1.41

Q-5 Hartley oscillator is commonly used in

(1) Radio receivers

(2) Radio transmitters

(3) TV receivers

(4) Microwave transmitters

Q-6. The multiplexer is also known as

(1) Counter

(2) Decoder

(3) Shift register

(4) Data selector

Q-7 Quantizing Noise occurs in

(1) Time-division multiplexing

(2) Frequency-division multiplexing

(3) Pulse-Code modulation

(4) Pulse width modulation

Q-8 CMRR (Common Mode Rejection Ratio) for a differential amplifier should be

(1) Zero

(2) Unity

(3) Small

(4) Large

Q-9. An ideal op-amp has

(1) Infinite common mode gain as well as differential gain.

(2) Infinite common mode gain and zero differential gain.

(3) Infinite differential gain and zero common mode gain.

(4) Zero differential gain and infinite common mode gain.

Q-10 In 8085, example for Non-maskable interrupts is

(1) Trap

(2) RST 6.5

(3) INTR

(4) RSTO

Q-11. The pH is a measure of

(1) Acidity

(2) Density

(3) Specific density

(4) Solubility

Q-12. To separate channels in an FDM receiver, it is necessary to use

(1) Integration

(2) Band pass filter

(3) Differentiation

(4) AND gates

Q-13 Time-Division Multiplex

Options:-

(1) Can be used with PAM only

(2) Combines five groups into a super group

(3) Stacks 24 channels in adjacent frequency slots

(4) Interleaves pulses in time domain belonging to different transmissions

Q-14 In Half Duplex (HDX) , data transmission is possible

(1) In one direction

(2) In both direction

(3) In both directions, but not at the same time

(4) In both directions simultaneously

Q-15 Indicate which of the following system is digital?

(1) Pulse – Position Modulation

(2) Pulse – Code Modulation

(3) Pulse – Width Modulation

(4) Pulse – Amplitude Modulation