cbsenet.nic.in Electronic Science Model Question : Central Board Of Secondary Education

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 2 10.07.2016 :  https://www.pdfquestion.in/uploads/10578-Elect.Sci.pdf
Paper 2 28.08.2016 : https://www.pdfquestion.in/uploads/10578-ElectronicSci28.pdf

Electronic Science Model Question :

Time : 1 1/4 hours
Maximum Marks : 100
Instructions for the Candidates :
1. Write y our roll number in the space provided on the top of this page.
2. This paper consists of fifty multiple-choice type of questions.

Related / Similar Question Paper : CBSE NET Environmental Sciences Question Paper

3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below :
(i) To have access to the Question Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet.

(ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any ther discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the Question ooklet will be replaced nor any extra time will be given.

(iii) After this verification is over, the Test Booklet Number should be entered on the OMR Sheet and the OMR Sheet Number should be entered on this Test Booklet.

4. Each item has four alternative responses marked (1), (2), (3) and (4). You have to darken the circle as indicated below on the correct response against each item.

5. Your responses to the items are to be indicated in the OMR Sheet given inside the Booklet only. If you mark your response at any place other than in the circle in the OMR Sheet, it will not be evaluated.
6. Read instructions given inside carefully.
7. Rough Work is to be done in the end of this booklet.

8. If you write your Name, Roll Number, Phone Number or put any mark on any part of the OMR Sheet, except for the space allotted for the relevant entries, which may disclose your identity, or use abusive language or employ any other unfair means, such as change of response by scratching or using white fluid, you will render yourself liable to disqualification.

9. You have to return the Original OMR Sheet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. You are, however, allowed to carry original question booklet and duplicate copy of OMR Sheet on conclusion of examination.

10. Use only Black Ball point pen provided by C.B.S.E.
11. Use of any calculator or log table etc., is prohibited.
12. There is no negative marks for incorrect answers.

Note :
** This paper contains fifty (50) objective type questions of two (2) marks each.
** All questions are compulsory.

1. In a circuit shown below the base current is
(1) 2.55 µA
(2) 5.4 µA
(3) 2.66 µA
(4) 3.6 µA

2. A conducting line on an IC chip is 2.8 mm long and has a rectangular cross-section 1 × 4 micrometer. A current of 5 mA produces a voltage drop of 100 mV across the line. If the electron mobility is 500 cm2/V.s., the electron concentration is
(1) 4.38 × 1021 cm–3
(2) 4.38 × 1027 cm–3
(3) 3.98 × 1021 cm–3
(4) 4.29 × 1027 cm–3

3. The following state diagram belongs to
(1) J K flip flop
(2) R S flip flop
(3) T flip flop
(4) D flip flop

4. 8086 is interfaced to two 8259s (programmable interval timer). If 8259s are in master slave configuration, the number of interrupts available to the 8086 microprocessor is
(1) 8
(2) 16
(3) 32
(4) 64

5. A function q that accepts a pointer to a character as argument and returns a pointer to an array of integer, can be declared as
(1) int * q (char *) []
(2) int (* q (char *)) []
(3) int (* q) (char *) []
(4) None of the above

6. TRAPATT is used as
(1) amplifier in radars
(2) local oscillator in radars
(3) switch in communication systems
(4) low frequency oscillator

7. Tunnel diode is used as
(1) High speed switch
(2) Clipper
(3) Low gain amplifier
(4) Low frequency oscillator

8. Which of the following cannot be the Fourier series expansion of a periodic signal ?
(1) x(t) = 2 cos t + 3 cos 3t
(2) x(t) = 2 cos pt + 7 cos t
(3) x(t) = cos t + 0.5
(4) x(t) = 2 cos 1.5 pt + sin 3.5 pt

9. The main advantage of TDM over FDM is that it
(1) needs less power
(2) needs less bandwidth
(3) needs simple circuitry
(4) gives better signal / noise ratio
TDM stands for Time Division Multiplexing
FDM stands for Frequency Division Multiplexing

10. If ‘L’ is the length, ‘W’ is the width and ‘t’ is the thickness of a semiconductor layer to form a resistor, the sheet resistance is defined as
(a) p/t
(b) L/tA
(c) R/t
(d) RW/L
Out of the above which one is correct ?
(1) (a) and (b) are correct. (2) (b) and (d) are correct.
(3) (a) and (d) are correct. (4) (b) and (c) are correct.