Organisation : Central Board Of Secondary Education
Exam : National Eligibility Test (NET)
Document Type : Model/Previous Question Paper
Subject : Electronic Science
Date/Year : 10.07.2016 & 28.08.2016
Website : http://cbsenet.nic.in/cbsenet/QuestionPaperJuly2016.aspx
Download Sample Question Paper :
Paper III 10.07.2016 : https://www.pdfquestion.in/uploads/10791-Electronic.pdf
Paper III 28.08.2016 : https://www.pdfquestion.in/uploads/10791-ElectronicScience28.pdf
Electronic Science Model Question :
Time : 2 1/2 hours
Maximum Marks : 150
Note :
** This paper contains seventy five (75) objective type questions of two (2) marks each.
** All questions are compulsory.
Related : Central Board Of Secondary Education NET Computer Science & Applications Model Question : www.pdfquestion.in/10787.html
1. When gate to source voltage of a FET changes from –5.2 volt to –5 volts, the corresponding drain current changes from 1 mA to 1.3 mA, the transconductance is
(1) 29 µ mho
(2) 510 µ mho
(3) 1500 µ mho
(4) 1620 µ mho
2. The power dissipation in the resistor R4 of the following circuit will be
(1) 10 watts
(2) 15 watts
(3) 20 watts
(4) 100 watts
3. For a transistor inverter shown below, if IC sat is 10 mA, the value of RB and RC are
(1) 150 O and 1 kO
(2) 150 kO and 100 kO
(3) 155 kO and 1 kO
(4) 155 kO and 10 kO
4. The circuit shown below is a
(1) Free running multivibrator
(2) Monostable multivibrator
(3) Comparator
(4) Schmitt trigger
5. The circuit shown in the figure is equivalent to
(1) OR gate
(2) EX-OR gate
(3) NAND gate
(4) AND gate
6. Contents of ‘A’ register after execution of the following 8085 microprocessor program is
MVI A, 55 h
MVI C, 25 h
ADD C
DAA
(1) 22 h
(2) 50 h
(3) 80 h
(4) 7 Ah
7. The ALE line of an 8085 microprocessor is used to
(1) latch the output of an I/O instruction into an external latch.
(2) deactivate the chip-select signal from memory devices.
(3) find the interrupt enable states of the TRAP interrupt.
(4) latch the 8 bits of address lines AD7-AD0 into an external latch.
8. A constructor is called whenever
(1) A class is declared.
(2) An object is declared
(3) A class is used.
(4) An object is used.
9. If 1 MHz carrier is amplitude modulated with a 5 kHz audio signal, the Upper Side Band (USB) and Lower Side Band (LSB) frequencies are ________ respectively.
(1) 1005 kHz & 995 kHz
(2) 1.05 MHz & 9.05 MHz
(3) 1.5 MHz & 0.95 MHz
(4) 1010 kHz & 990 kHz
10. A plastic-clad fiber has similar characteristics as an all-glass fibre except that it is more sensitive to ________ damage.
(1) Corrosion
(2) Abrasive
(3) Chemical
(4) Moisture
11. Which of the following is not a usual classification of optical fibre ?
(1) Single mode step index (2) Single mode graded index
(3) Multimode step index (4) Multimode graded index
12. The addition of a pole to the forward path transfer function of a closed loop system, generally has the effect of
(1) Decreasing the maximum overshoot
(2) Increasing the maximum overshoot
(3) Maintaining the maximum overshoot
(4) Does not affect the maximum overshoot
13. The static current voltage characteristics of a tunnel diode consist of
(a) Tunneling current and thermal current
(b) Thermal current and excess current
(c) Tunneling current only
(d) Tunneling current, excess current and thermal current
Out of these which are correct ?
(1) (a) and (c) are correct
(2) (c) is correct but (d) is wrong
(3) (d) is correct but (a) is wrong
(4) (b) and (d) are wrong
14. Read the following statements regarding Thevenin’s equivalent circuit :
(a) The Thevenin’s voltage is calculated across the short circuit terminals.
(b) The Thevenin’s voltage is calculated at the open circuit terminals.
(c) The connection in the circuit is open if any voltage source is present.
(d) The connection in the circuit is shorted if any voltage source is present.
Which of the above statements are incorrect ?
(1) (a) and (b) (2) (b) and (c)
(3) (a) and (c) (4) (b) and (d)
15. For TTL families, following statements are given :
(a) Speed-frequency product is called figure of merit.
(b) TTL is most widely used and has 4 sub-families.
(c) High speed TTL uses smaller resistor and Darlington pair.
(d) A TTL circuit acts as a current sink in the low state and as a current source in high state.
Out of the above, following is correct :
(1) (a), (b), (c) (2) (c) and (d)
(3) (a), (c), (d) (4) (b), (c), (d)