I have a sample paper of DRDO Exam (Computer Science Paper), so here I am providing you as you want.

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1. In MICR, C stands for
(a) Character
(b) Colour
(c) Computer
(d) Code

2. Process is
(a) Program in High level language kept on disk
(b) Contents of main memory
(c) A program in execution
(d) A job in secondary memory

3. A development stategy whereby the executive control modules of a system are coded and tested first, is known as
(a) Bottom-up development
(b) Top-down development
(c) Left-Right development
(d) None of the above

4. Which of the following performs modulation and demodulation.
(a) Coaxial cable
(b) Modem
(c) Satellite
(d) Optical fiber

5. A complete electronic circuit with transistors and other electronic components on a small silicon chip is called a(n)-
(a) Integrated circuit
(b) Workstation
(c) CPU
(d) Magnetic disk

6. How many digits of the DNIC (Data Network Identification Code) identify the country.
(a) First six
(b) First five
(c) First three
(d) First four

7. How much power (approx.) a light-emitting diode can couple into an optical fiber.
(a) 10 miliwatts
(b) 440 microwatts
(c) 100 picowatts
(d) 100 microwatts

8. The pattern of printed lines on most products are called
(a) OCR Code
(b) MICR
(c) MICR Codes
(d) Barcodes

9. Which provides the fastest access to large video files.
(a) Optical drives
(b) IDE hard drives
(c) SCSI hard drives
(d) EIDE hard drives

10. What allows you to print on both sides of the printer
(a) Duplexer
(b) Toner Cartride
(c) Fuser
(d) Paper Swapping unit


Ans. 1 (a) 2 (c) 3 (b) 4 (b) 5 (a) 6 (c) 7(d) 8 (d) 9 (c) 10.(a)





DRDO Previous Year Question with Answer

Q.1 Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is

A. 5.7 mH
B. 5.85 mH
C. 6 mH
D. 6.15 mH.

ANS A

Q.2 The difference between the indicated value and the true value of a quantity is known as

A. Gross error
B. Absolute error
C. Dynamic error
D. Relative error

ANS C

Q.3 Optocouplers combine

A. SITs and BJTs
B. IGBTs and MOSFETS
C. Power transformers and silicon transistor
D. Infrared light-emitting diode and a silicon phototransistor

ANS D

Q.4 An instruction used to set the carry Flag in a computer can be classified as

A. data transfer
B. arithmetic
C. logical
D. program control

ANS B

Q. 5 Frequency in the UHF range propagate by means of

A. Ground waves
B. Sky waves
C. Surface waves
D. Space waves.

ANS D

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Q. 6 DC energy required for satellites is generally derived from

A. Solar cells and nickel-cadmium cells
B. Solar cells only
C. Regulated d.c. poser supplies
D. Some special batteries.

ANS A

Q.7 Baretters and bolo meters are used for measurement of

A. VSWR
B. transmission losses
C. microwave power
D. none of these

ANS C

Q.8 Transponder comprises of

A. Transmitter
B. Receiver
C. Antenna
D. a, b, c combined

ANS D

Q.9 The polarization required in ground wave propagation is

A. Horizontal (linear)
B. vertical (linear)
C. Circular
D. Elliptical

ANS B

Q.10 Which of the following regulator provides output voltage polarity reversal without a transformer?

A. Buck regulator
B. Boost regulator
C. Buck-boost regulator
D. Cuk regulator

ANS C

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Q.11 The deflection of hot wire instrument depends on

A. RMS value of alternating current
B. voltage
C. average value of a.c. current
D. instantaneous value of a.c. current

ANS A

Q.12 The electric field lines and equipotential lines
A. Are parallel to each other.
B. Are one and the same.
C. Cut each other orthogonally.
D. Can be inclined to each other at any angle.

ANS C

Q.13 For an SCR, di/dt protection is achieved through the use of

A. R in series with SCR.
B. L in series with SCR.
C. RL in series with SCR.
D. RLC in series with SCR.

ANS B

Q.14 In a linear system, an input of 5 sin wt produces an output of 10 cos wt. The output corresponding to input 10 cos wt will be equal to

A. + 5 sin wt
B. - 5 sin wt
C. + 20 sin wt
D. – 20 sin wt

ANS D

Q.15 A single instruction to clear the lower four bits of the accumulator I 8085 assembly language is:

A. XRI OHF
B. ANI FOH
C. XRI FOH
D. ANI OFH

ANS B

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Q.16 In ‘plasma’ state a gas
A. loses electrical conductivity
B. attracts moisture
C. becomes perfect dielectric medium
D. conducts electricity

ANS D

Q.17 Which type of transmission line will have the maximum value of characteristic impedance?

A. Open wire line
B. Twin lead line
C. Coaxial cable
D. All have same impedance

ANS B

Q.18 A universal motor runs at

A. Higher speed will dc supply and with less sparking.
B. Higher speed with ac supply with less sparking.
C. Same speed both ac and dc supplies.
D. Higher speed with ac supply but with increased sparking at the brushes.

ANS A

Q.19 The copper armature winding of a motor is subjected to an operating temperature of 80°C. The room temperature is 20° C. The percentage change in resistance of the armature winding from cold staring condition to normal running will be nearly:

A. 10%
B. 16%
C. 20%
D. 24%

ANS C

Q.20 A zener diode works on the principle of

A. Tunneling of charge carriers across the junction
B. Thermionic emission
C. Diffusion of charge carriers across the junction
D. Hoping of charge carriers across the junction

ANS A




1. If 100ns is Memory Access Time & 125 microsec is 1frame period. The no. of line that can be supported in a Time Divison Switch is
a)125 Lines
b)625 Lines
c)525 Lines
d)465 Lines

2. The no. of edjes in disjoint Hamilton circuit in a complex graph with 17 edges is
a) 8
b) 9
c) 136
d) 17^2

3. 15 persons in a club sit every day ina dinner table such that every member has different neighbour. This arrangement will last for how many days.
Assume a system has 16MB cache mean Disk Access Time & cache Access time is 76.5 ns & 1.5 overall mean Access time us 465ms for each tripling the memory the miss rate is halved. The memory required to bring down the mean Access time to 24ns is
a) 16 MB
b) 24 MB
c) 32 MB
d) 48 MB

4.Average transfer speed of a i/p serial line is minimum 25,000 Bytes & maximum 60000 Bytes. Polling Strategy adopted takes 4microsec(whether there is any i/p byte or not). It is assured that byte that retrived from controller before next byte arrives are lost. Then the maximum safe polling interveal is
a) 12
b) 12.33
c) 12.67
d) 32

5. A harddisk has a rotation speed of 4500RPM. then the latency time is
a) .4
b) .6
c) .7
d) .9

6.Suppose all elements above the principal diagonal od n x n matix A are zero. If non zero elements of the lower triangular Matrix is stored in an array B with A[1][1] stored at B[1]. The addressing formula to the nonzero element in A[i][j]=?
a) A[i][j]
b) i(j-1)/2 +i
c) j(i-1)/2 +i
d) i(i-1)/2 +j

7.The minumum number of comparisons requied to find the second smallest element in a 1000 element array is
a) 1008
b) 1010
c) 1999
d) 2000

8.The internal path length of a Bonary Tree with 10nodes is 25. The external path length is
a) 25
b) 35
c) 40
d) 45

9.Average No. of Comparisons required to sort 3 elements is
a) 2
b) 2.33
c) 2.67
d) 3

10.In a switch the mean arrival rate of packets is 800 Packets/sec and the the mean service rate is 925 Packets/sec
a) .008 Sec
b) .08 sec
c) .8 sec
d) 1.1 sec

11. What is Interface Control Information?

12. The minumum no. of Multiplications needed to compute x^768 is
a) 9
b) 10
c) 425
d) 767

13. Find values for a,b,c,d
c 1 1 1
0 a 1 b
_______
1 0 d 0

(967)basex = 321base9

14. The area of red planet where the Mars Rover Landed? In Which Day world Telecom Day Celebrated? Laser is used for what?
a) Treatment of Cancer
b) Treatment of Eyes
c) Treatment of Heart
d) Treatment of Kidney

15.Which country is not a Member of SAARC
a) Bangladesh
b) Myanmar
c) Maldives
d) Nepal

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16.The New Biotechnology Software intorduced by TCS is? What is Wi Fi?

17.Which is the fastest Cruise Missile?