Sunday, June 26, 2016

BSNL TTA Model Questions

1. X2 - 4X - 2Y + Y2 = 4 represents a circle with
(a) radius = 3

(b) radius = 4

(c) radius = 2

(d) radius = 5

2. Which of these represent two parallel lines:
(a) Y - 4X - 4 = 0

(b) Y + AX - 4 = 0

(c) Y - 4X - 1 =0

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) None of these.

3. The conjugate of complex numbers 3 + 2j is
(a) 3 - 2j

(b) 2 + 3j

(c) 2 - 3j

(d) 3 + 4j

4. A Square matrix each of whose diagonal element is 1 and each of the non-diagonal element is zero is called

(a) Null matrix

(b) Unit matrix

(c) Diagonal matrix

(d) Orthogonal matrix

5. The determinant of matrix <image> is
(a) 1

(b) 9

(c) 15

(d) 21

6. The charge of an electron is equal to
(a) 1.6 x 10-16 C

(b) -1.6 x 10-16 C

(c) 1.6 x 1019 C

(d) -1.6 x 1019 C

7. The potential energy of a charged conductor is
(a) 1/2 CV2

(b) 1/2 QV

(c) Both (a) and (b)

(d) None of these

8. Capacitors are mainly used in
(a) Electrical instruments

(b) Storage of electrical energy

(c) Overcoming voltage fluctuations

(d) All the above

9. Two capacities of 4 μF and 12 μF are joined in parallel. The total capacitance is
(a) 8 μF

(b) 16 μF

(c) 3 μF

(f) 2 μF

10. What is the total resistance between points 'A' and 'B' in the given circuit

(a) 12/7 O

(b) 15 O

(c) 7 O

(d) 7/12 O

11. A current of 12 A is passing through a pure resistive circuit when the potential difference of 60 volts is applied across it, if the potential difference applied is reduced to 12 V, the current would be

(a) 12/5 A

(b) 60 A

(c) 12 A

(d) 2 A

12. Which of these normally used household electrical bulbs will be having maximum resistance.

(a) 100 Watt bulb

(b) 50 Watt bulb

(c) 200 Watt bulb

(d) 25 Watt bulb

13.The distance of point P (4, 3) from the origin will be

(a) 7

(b) 1

(c) 5

(d) 9

14. The slope of the line passing from points (7, 3) and (5, 1) is

(a) 1

(b) 2

(c) 3

(d) 4

15. A line perpendicular to line 3x + 4y + 5 = 0 can be

(a) 4x + 3y + 4 = 0

(b) 4x - 3y + 3 = 0

(c) 3x - 4y + 5 = 0

(d) 3x - 4y + 2 = 0.

16. The centre of the circle x2 + 6x - 4y + y2 + 12 = 0 will be at

(a) (-3, 2)

(b) (3, -2)

(c) (-2, 3)

(d) (2, -3)

17. The product of (3 + 4j) and its conjugate is

(a) 7

(b) 25

(c) 12

(d) 21

18. During charging of a lead acid cell, the specific gravity of electrolyte will

(a) Increase

(b) Decrease

(c) Remain constant

(d) Increase then Decrease

19. The decimal number '12' is represented in binary system as

(a) 1100

(b) 0110

(c) 1010

(d) 1110

20. What is the value of current that will flow when a p. d. 200 V is applied across a circuit of 50 O 

(a) 4 A

(b) 0.4 A

(c) 10 A

(d) 1 A

21. If both the inputs to a Nand Gate are '1', the output would be

(a) 1

(b) 0

22. If input 'A' is 1 and input 'B' is 0, then output X will be

(a) 0

(b) 1

23. The truth-table of a Nand Gate is


0 0 1

0 1 1

1 0 1

1 1 0



0 0 0

0 1 0

1 0 0

1 1 1



0 0 0

0 1 1

1 0 0

1 1 1

(d) None of these

24. IC chip is usually made of

(a) Lead

(b) Silicon

(c) Chromium.

(d) None of these.

25. Below given network is connected to a 16 V battery with internal resistance of 1 O. What will be 
current drawn from the battery?


(a) 2 A

(b) 3 A

(c) 12/7 A

(d) 7/12 A

26.Determine the equivalent resistance of the following network:

(a) 6 O

(b) 12 O

(c) 3 O

(d) 9 O.

27. A Zener diode is
(a) Forward biased heavily doped silicon p-n junction

(b) Reversed biased heavily doped silicon p-n junction

(c) Forward biased diode operating at breakdown point

(d) Is used as rectifying device

28. Crystal oscillator is used when frequency required is
(a) High

(b) Low

(c) Constant

(d) Varying.

29. What is the energy in a quantum of radiation having a wave length of 5000 A?
(a) 3.98 x 10-19 J

(b) 3.98 x 10-9 J

(c) 2.9 x 10-19 J

(d) 7.9 x 10-19 J.

30. Which of these cannot store energy?
(a) Capacitor

(b) Inductor

(c) Resistance

(d) LC circuit.

31. A short bar of magnet placed with its axis at 300 with a uniform external magnetic field of 0.16 T experiences a torque of magnitude 0.032 J. What is the magnetic moment of the magnet?

(a) 0.40 JT-1

(b) 4.0 JT-1

(c) 0.04 JT-1

(d) 0.2 JT-1

32. The total force on a charge 'q' with velocity "V" in an electric field 'E' and magnetic field 'B' will be
(a) q (E + V x B)

(b) q(E + V.B)

(c) qE + VxB

(d) q(B + V x E)

33. The magnetic field B at the centre of a circular current loop of radius 'a' is given by
(a) B =μ0 I/2a

(b) B = μ0 I/a

(c) B = 2μ0 I/a

(d)B = μ0 a/2I

34. If f = x2 + 4xy + y2 + 9, then which of the following is not true:
(a) ?f/?x = 2x + 4y

(b) ?f/?y = 4x + 2y

(c) ?2f/?x2 = 2

(d) ?2f/?x?y = 4

35. A hollow metal ball 8 cm in diameter is given a charge of - 4 x 10-8 C. The potential on the surface of the ball is
(a) - 9000 V

(b) - 900 V

(c) - 90 V

(d) Zero.

36. The effective capacitance between X and Y is

(a) 8/3 μF

(b) 7/6 μF

(c) 5/6 μF

(d) 2 μF.

37. The amount of work done is joules in carrying a charge + Q alongwith path ABCD and back to A 
between two oppositely charged plates is:


(a) Q

(b) 4Q


(d) Zero.

38. How many electrons are contained in 1C?
(a) 6.25 x 1018

(b) 6.25 x 1019

(c) 6.25 x 1020

(d) 6.25 x 1021

39. The phase angle between voltage and current in an a. c. circuit through a pure capacitance is
(a) 180°

(b) 90°

(c) 60°

(d) 0°

40. The permeability of a material is 0.998. It is:
(a) Diamagnetic

(b) Paramagnetic

(c) Ferromagnetic

(d) Anti ferromagnetic.

41. The ratio of the specific charge of an electron to that of a positron is
(a) 1:1

(b) 1:2

(c) 2:1

(d) 4:1.

42. With increase in temperature, the electrical conductivity of intrinsic semiconductor
(a) Increases

(b) Decreases

(c) First increases then decreases

(d) First decreases then increases.

43. In a common collector circuit, input resistance is:
(a) Very high

(b) Very low

(c) Zero

(d) Moderate.

44. A electron jumps from the 4th orbit to the 2nd orbit of hydrogen atom. If R = 107/m, the frequency of emitted radiations will be

(a) 3/16 x 105 Hz

(b) 3/16 x 1015 Hz

(c) 9/16 x 1015 Hz

(d) 3/4 x 1015 Hz.

45. I amu. equals

(a) 1.67 x 10-27 g

(b) 1.67 x 10-28 g

(c) 1.67 x 10-29 g

(d) 1.67 x 10-27 kg

46. A tuning fork produces 4 beats/sec both with 50 and 40 cms of a stretched wire of a sonometer. The frequency of the tuning fork is

(a) 36 Hz

(b) 50 Hz

(c) 90Hz

(d) 110 Hz

47. A particle is executing SHM with an amplitude 4 cm. At what displacement its energy is half kinetic and half potential

(a) 2v2cm

(b) v2 cm

(c) 2 cm

(d) 1 cm.

48. An electron moves with a constant velocity V parallel to the direction of uniform magnetic field 'B'. The force experienced by the electron is

(a) BeV

(b) eV/B


(d) Zero.

49.A charged particle is moving along the axis of X. If an electric field is applied along the axis of Y, the motion of the particle in Y-Y plane will be

(a) Elliptical

(b) Parabolic

(c) Circular

(d) Linear

50. An electric or magnetic field cannot accelerate

(a) Electrons

(b) Protons

(c) Neutrons

(d) Alpha particles

BSNL TTA Junior Engineer Post Computer Science Basic Questions

1. What is the name of the software that allows us to browse through web pages?

(a) Browser

(b) Mail Client

(c) FTP Client

(d) Messenger

2. What is the address given to a network called?

(a) System Address


(c) Process ID

(d) IP Address

3. Which one of the following is a valid DOS command?

(a) LIST *.*

(b) LIST???.



4. All system settings in WINDOWS are stored in:





5. Which number system is usually followed in a typical 32-bit computer?

(a) 2

(b) 10

(c) 16

(d) 32

6. Which of the following is not an output device:

(a) Printer

(b) Scanner

(c) Flat Screen

(d) Touch Screen

7. A microprocessor is a processor with reduced

(a) instruction set

(b) power requirement

(c) MIPS performance

(d) none of the above

8. Which of the following is not an output of an assembler?

(a) executable program

(b) source listing with line numbers and errors

(c) a symbol table

(d) object program

9. Which layer of OSI model is responsible for routing and flow control:

(a) Presentation

(b) Transport

(c) Network

(d) Data Link

10. Arrays are passed as arguments to a function by

(a) value

(b) reference

(c) both a and b

(d) none of the above

11. Array is:

(a) linear data structure

(b) non-linear structure

(c) none of the above

12. A data structure in which elements are added and removed from only one end, is known as:

(a) Array

(b) Stack

(c) Queue

(d) None of the above

13. A diamond-shaped box in an Entity-Relationship diagram refers to:

(a) Entity

(b) Relationship

(c) Attribute

14. The principle means of identifying entities within an entity set is:

(a) Primary Key

(b) Record

(c) Attribute

(d) Tuple

15. Modem refers to:

(a) Modulator

(b) Modulation

(c) Demodulator

(d) Modulator and Demodulator

16. C language is available for which of the following Operating Systems?

(a) DOS

(b) Windows

(c) Unix

(d) All of the above

17. Which of the following have the fastest access time?

(a) Magnetic Tapes

(b) Magnetic Disks

(c) Semiconductor Memories

(d) Compact Disks

18. DMA stands for:

(a) Direct Memory Allocation

(b) Distinct Memory Allocation

(c) Direct Memory Access

(d) Distinct Memory Access

19. Array subscripts in C always start at:


(b) 0

(c) 1

(d) Value provided by user

20. Which type of commands in DOS needs additional files for their execution?

(a) Batch Commands

(b) Internal Commands

(c) External Commands

21. Which of the following statements in regard to Directories is false?

(a) Directories can exist inside directories

(b) The root directory is always at the highest level

(c) Directories with files can be deleted

(d) Directories cannot be renamed

22. It is better to buffer a table when

(a) When a table is read infrequently

(b) When a table is linked to check tables

(c) When a table is read frequently and the data seldom changes

(d) When a single record is to be picked up

23. The Operating System is responsible for:

(a) Controlling peripheral devices such as monitor, printers, disk drives

(b) Provide an interface that allows users to choose programs to run and to manipulate files

(c) Manage users’ files on disk

(d) All of the above

24. A company whishes to connect two sites in different parts of the country together. It is decided to

use the telephone system. What device should be connected to the fileservers on each site?

(a) Router

(b) Modem

(c) Switch

(d) Hub

25. What is a file server?

(a) A computer that performs a service for other computers

(b) A computer that controls the printers on the network

(c) A computer that stores files that are created by network users

26. What is the Protocol used for the Internet?




(d) TCP/IP

27. Which one of the following is not a Normal Forms (Normalization) rule with regards to the Relational


(a) All fields within a table must relate to or directly describe the Primary Key.

(b) Repeating Groups must be eliminated from tables.

(c) Fields that can contain non-numeric data are to be removed and placed within their own tables with

an associated Primary Key.

(d) Redundant data is to be eliminated by placing the offending fields in another table.

28. Choose the answer which best describes the term Primary Key:

(a) The Primary Key is a field that contains data that can be duplicated.

(b) The Primary Key is a field that contains data that is unique.

(c) The Primary Key is a field that is never associated with any field in other tables.

(d) The Primary Key field is a concept used only in Microsoft Access.

29. Which technique is used to reduce the size of a file:

(a) Compression

(b) Decompression

(c) Encryption

(d) Decryption

30. BIOS stands for

(a) Binary Input Output Set

(b) Binary Input Output System

(c) Basic Input Output Set

(d) Basic Input Output System

31. A floppy disk is consisting of 40 tracks, each track contains 100 sectors, and the capacity of a sector

is 512 bytes, what is the approx. size of that disk?

(a) 1 MB

(b) 2 MB

(c) 4 MB

(d) 8 MB

32. What is the binary equivalent of a decimal number 68:

(a) 1000100

(b) 1100100

(c) 1000010

(d) 1000001

33. Assembly language to machine language translation is:

(a) One-to-One

(b) One-to-Many

(c) Many-to-One

(d) Many-to-Many

34. Maximum size of IP address is:

(a) 12 bits

(b) 24 bits

(c) 32 bits

(d) 48 bits

35. RAM stands for

(a) Read Access Memory

(b) Read After Memory

(c) Random Access Memory

(d) Random After Memory

36. What is the final value of sum?

main ()


int sum=1;


printf(%d\n, ++sum);


(a) 9

(b) 10

(c) 11

(d) none of the above

37. If c is a variable initialized to 1, how many times the following loop be executed:

while(c>0 && c<60)




(a) 59

(b) 60

(c) 61

(d) none of the above

38. The declaration void fun(int) indicates the fun is a function which:

(a) has no arguments

(b) returns nothing

(c) both a and b

(d) none of the above

39. Out of the following which is not valid network topology:

(a) Bus

(b) Star

(c) Circle

(d) Tree

40. The overall logical structure of a database can be expressed graphically by:

(a) Data Flow Diagram

(b) Flow Chart

(c) Directed Graph

(d) Entity-Relationship Diagram

41. CARRY, in a half-adder, can be obtained using:

(a) OR gate

(b) AND gate

(c) EX-OR gate

(d) EX-AND gate

42. The memory that requires refreshing of data is:

(a) SROM

(b) DROM

(c) SRAM

(d) DRAM

43. The minimum number of bits required to represent numbers in the range:28 to +31 is-

(a) 5

(b) 6

(c) 7

(d) 8

44. Which bus carries information between processors and peripherals?

(a) Data bus

(b) Control bus

(c) Address bus

(d) Information bus

45. Which part of the computer perform arithmetic calculations?

(a) Control unit

(b) Registers

(c) ALU

(d) CPU

46. A gigabyte represents:

(a) 1 billion bytes

(b) 1000 kilobytes

(c) 230 bytes

(d) 10 megabytes

47. The minimum number of bits required to store the hexadecimal number FF is:

(a) 2

(b) 4

(c) 8

(d) 16

48. Cache memory enhances:

(a) memory capacity

(b) memory access time

(c) secondary storage capacity

(d) secondary storage access time

49. A UPS:

(a) increases the storage capacity of a computer system

(b) increases the processor speed

(c) provides backup power in the event of a power cut\

(d) none of the above

50. An RDBMS is a:

(a) Remote DBMS

(b) Relative DBMS

(c) Reliable DBMS

(d) Relational DBMS

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