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Saturday, September 3, 2011

HSST Computer Science Solved Question & Answer Key 2011

Compiled by PSCTrainer.com

1. In C language an user defined header is identified by the inclusion :
(A) # include "test.h"
(B) # include < test.h >
(C) include "test.h"
(D)None of these

2. Number of locations that could be addressed by a microprocessor with 12 address lines is :
(A)1024
(B) 64K
(C) 4096
(D) 2048


3. Number of bit width of any memory chip is :
(A) 16
(B) 64
(C) 32
(D) 8

4. The command that lists the last few lines from a file name "file"
(A) tail file
(B) end file
(C) grep file
(D) cat file -last25

5. The percentage of time that a computer system is not available for use is :
(A) Down Time
(B) Seek Time
(C) Delay Time
(D) Access Time

6. By the thread of the same process, sharing is not allowed in :
(A) queue
(B) message
(C) stack
(D) address space

7. How to declare an interface class in C++ ?
(A) by declare all methods pure virtual in a class
(B) make all metods abstract in a class
(C) declare the class as interface
(D) none of the above

8. Which device translates between data formats ?
(A) Hub
(B) Switch
(C) Bridge(D) Gateways

9. In a relation is in BCNF then it is in :
(A) 2NF
(B) 3NF
(C) 1NF
(D) 1NF and 2NF

10. Minimum Hamming distance method is used for correction of :
(A)syntactic error
(B) semantic errors
(C) algorithm errors
(D) programming errors.

11. Full Binary tree with n leaves contain
(A)n nodes
(B)2n-1 nodes
(C)n-1 nodes
(D)log n nodes

12. What is not possible in a thread?
Ready
Wait
Suspended
Running

13. The margin of a word document can be displayed on the horizontal or vertical ruler with the mouse and the :

FONT SIZE button
ALT Key
DELETE Key
CTRL Key

14. The 2's complement of the binary value 10 is
(A)10
(B)11
(C)01
(D)110

15. The property that OOPs will permit the same operation to be carried out differently, based on the object
(A)inheritance
(B)polymorphism
(C)function overloading
(D)data abstraction

16. The IP address 127.0.0.1 is named as
(A)Loopback address
(B)IP address in a standard network
(C)LAN server address
(D)Default router address

17. The Virtual Memory is located logically:
(A) in the CPU
(B) in main Memory
(C) in between CPU and primary memory 
(D) in the Hard disk

18. The Banker's algorithm in resource allocation deals with':
(A) Dead lock prevention
(B) Dead lock recovery
(C) Dead lock avoidance
(D) Mutual exclusion


19. Thrashing occurs in:
(A) large computers
(B) a natural consequence of the virtual memory system
(C) can always be avoided by swapping
(D) poor paging algorithm


20. Compilers can identify:
(A) syntax errors
(B) semantic errors
(C) logical errors
(D) mathematical errors


21. What was the first Scientific Computer Programming Language?
(A) COBOL
(B) LISP
(C) ADA
(D)FORTRAN

22. Which is the first Object Oriented Language?
(A) ADA
(B) COBOL
(C) LISP
(D) FORTRAN


23. Producer consumer problem is example for application of:
(A) Monitors
(B) For Monitors, Semaphores and Event counters
(C) Semaphores
(D) Event counters


24. What was the data transmission method in which bi-directional data flow is allowed?
(A) Simplex
(B) Duplex
(C) Analog
(D) Single side mode

25. Yahoo was developed by :
(A) Dennis Ritchie and Ken Thompson
(B) Vint Cerf and Robert Kahn
(C) David Filo and Jerry Yang
(D) Steve Case and Jeff Bezos

26.Resolution of Video display unit does not depend on:
(A) Raster scan rate
(B) Band width
(C) Vertical and horizontal Scans
(D) Screen size


27.Resolution of Video display unit does not depend on:
(A) Raster scan rate
(B) Band width
(C) Vertical and horizontal Scans
(D) Screen size


28. The true statement for parallel transmission is :
(A) simultaneous transmission of all bits
(B) speed is specified in bps
(C) slower than serial
(D) micro computers use this


29. Gray code for the decimal number 7 is :
(A) 0111
(B) 0100
(C) 0101
(D)1011

30. Evaluate the pre-fix expression -*63-41 will result in :
(A) 25
(B) 23
(C) 15
(D) 12

3l. Error correction in the data link layer is achieved by :
(A) Equalization
(B)Cyclic redundancy codes
(C) Hamming codes
(D) Bit stuffing

32. The system program that set up executable program in RAM, ready for execution is :
(A) Loader 
(B) Linker
(C) Linkage editor
(D) Compiler ,

33. File transfer protocol that uses UDP is :
(A) FTP
(B) TFTP
(C) TELNET
(D) NFS

34. To check the presence of a computer in the network, ,use the command:
(A) ping
(B) cmd
(C) check
(D) ipconflg

35. In cryptology the code STUDYING is written as RUTEXJMH, then the code for OTHER is :
(A) TOHRE
(B) ROHTE
(C) NUGFQ
(D) MOTHR

36. The Number of the equivalent relations of the set {1,2,3,4} is : "
(A) 4
(B) 15
(C) 16
(D) 24

37. Which of the sets are empty?
(A) { x : x = / x}
(B) {x:x=x}
(D) {x:x =/ xx}
(C) {x:x=/x2}

38. In any undirected graph, the sum of the degrees of all nodes is :
(A) must be even
(B) is always ODD
(C) need not be even
(D) is twice number of edges

39. An undirected graph is Eulerian if and only if all vertices of G are of the sum of the degrees of all nodes is :
(A) Same degree
(B) ODD degree
(C) Need not be ODD
(D) Is twice number of edges

40. An undirected graph G has n vertices n - 1 edges then G is :
(A) Cyclic
(B) Addition of edge will make it cyclic
(C) Eulerian
(D) Is a Tree


41.Graph having every pair of vertices connected is called :
(A) Cycle graph
(B) Complete graph
(C) Peterson graph
(D) Is a Tree

42. The Eigen vectors of a real symmetric matrix corresponding to different Eigen values are:
(A) Orthogonal matrix
(B) Singular matrix
(C) Non-singular matrix
(D) Inverse matrix


43. The system of equations 4x + 6y = 8, 3x + 2y = 1, 7x + 8y = 9 has:
(A) only one solution
(B) infinite solutions
(C) two solutions
(D) none of these


44. The Eigen values of the square matrix are:
(A) positive
(B) imaginary
(C) real
(D) negative

45. The Equations will have:
(A) no unique solution
(B) only one solution
(C) has only two solutions
(D) has infinite

46.Which is fastest ?
(A) DTL
(B) TTL
(C) ECL
(D) CMOS

47.Which is commutative but not associative?
(A) NOT
(B) NOR
(C) XOR
(D) NAND


48. Which is Universal gate?
(A) AND
(B) NOR
(C) XOR
(D) NOT

49. How many NAND gates are needed to perform X . Y ?
(A) 3
(B) 4
(C) 2
(D) 1

50. Which is non-volatile?
(A) RAM
(B) PROM
(C) EPROM
(D) ROM


51. Which is the access method to take data from tape memory?
(A) Direct
(B) Sequential
(C) Parallel
(D) Serial

52. The cycle time for a memory system is :
(A) access time
(B) longer than access time
(C) less than access time
(D) sub multiple of access time

53. How many RAM chips are needed to generate the (256K X 1 bit)?
(A) 8
(B) 12
(C) 32
(D) 64

54. T flip-flops are generally used for:
(A) counter
(B) delay switch
(C) counter and frequency divider
(D) decoder


55. Register used as working area in CPU is:
(A) Program counter
(B) Stack,
(C) Instruction register
(D) Accumulator

56. A microprocessor can be :
(A) Programmable
(B) Non Programmable
(C) Micro programmable
(D) All of the above

57. Which is 16 bit microprocessor?
(A) Z 80
(B) Motorola 6800
(C) Intel 8086
(D) Intel 80486
58. "n" flip-flops will divide the frequency into a factor of :

(A) n
(B) 1/n
(C) 2 to the power of' n '
(D) log(n)

59. 8 2 4 1 is the :
(A) BCD code
(B) Gray code
(C) Excess -3 code
(D) ASCII code

60. (1001000010011001) base 2; equivalent in base 16 is :
(A) 9899
(B) 9989
(C) 8999
(D) 9999

61.Which is a programmable interval timer?(A) 8253
(B) NE 555
(C) 8275
(D) 8251

62. Negative number cannot be represented in:
(A) Signed magnitude form
(B) 1's complement form
(C) 2's complement form
(D) None of the above forms


63.Which of the following interrupt is both level and edge sensitive?(A) RST 5.5
(B) INTER
(C) TRAP
(D) RST 7.5

64. What is a BUFFER?
(A) Convert input data to output
(B) CPU stores program counter
(C) An Interphase between CPU and peripheral
(D) Convert program to EXE form

65. By default any real numb~r in C is represented as :
(A) a float
(B) a double
(C) a long double
 (D) long float

66. Integer division in "C" program results in :
(A)  Truncation
(B) Rounding
(C) Overflow
(D) None of above

67.The function sprintf() works like printf(), but operates on:(A) data in a file
(B) stderr
(C) stdin
(D) string

68. The function exit( ) causes an exit from:
(A) from loop .
(B) from the block
(C) from the function
(D) from program

69. The complexity of linear search algorithm of an array of n elements is :
(A) 0 log(n)
(B) 0 (n)
(C) Onlog(n)
(D) O(nXn)

70. How many elements can array A (-1..m ,1..m) have?
(A) mXm
(B)(m + l)(m + 1)
(C) mX(m-1)
(D)((m - n)Xn)

71. Which is useful to implement quick sort?
(A) List
(B) Set
(C) Stack
(D) Queue

72. Recursively enumerable languages are closed under:
(A) Union
(B) Intersection
(C) Complementation 
(D) Concatenation


73. The Grammar that produce more than one Parse tree for same sentence is :
(A) Ambiguous
(B) Unambiguous
(C) Complementation
(D) Concatenation Intersection

74. The number of the external states of a Turing Machine should be at least:
(A) 1 
(B) 2
(C) 3
(D) 4

75. Give name of the database in the general model of a compiler:
(A) Literal table
(B) Terminal table
(C) SYMTAB
(D) Productions

76. A file is :
(A) an abstract data type
(B) logical storage unit
(C)usually non volatile
(D) volatile

77. What property of the files prevent sharing of files and directories?
(A)Tree Structure
(B) One level.structure
(C) Two level structure
(D) Length

78. E-R modeling technique is :
(A) Tree structure
(B) Top-down method
(C) Bottom-up method
(D) Right-left approach

79. Data items stored as grouped items is :
(A) Record
(B) List
(C) Strings
(D) Title list

80. Data items are fragmented, replicated and propagated in :
(A) DBMS
(B) RDBMS
(C)  DDBMS
(D) DML

Note : DDBMS - Distributed Database Management System

8l. In data manipulation the first element of T[5] is :
(A) T[l]
(B) T[O]
(C) T[5]
(D) T[3]

82 . Processed data is called:
(A) Data base
(B) File
(C) Information
(D) Sample

83 . Which factor of coding is most important?
(A) Productivity
(B) Cost
(C) Readability
(D) Less memory usage

84. Main container for < TR > < TD > and < TH > is':
(A)< TABLE >
(B)< GROUP >
(C)< DATA >
(D)< CAPTION >

85. Which of the following is the non-polling system?
(A) Stop and wait
(B) Daisy chain
(C) DMA
(D) TDMA

86.   What is the working Principle of a Digital Computer?
(A) De Morgan's Principle
(B) Len's Principle
(C) Von Neumann's Principle
(D) Euler's Principle

87.  Give the unique name of the combination of Analog and Digital Computer
(A) Cray XMP 120 Computer
(B) Param 2000 Computer
(C) IBM 320 Computer
(D) Hybrid Computer

88. Why RAM is kept near to the Processor in a Digital Computer?
(A) Reduce the cost
(B) Get maximum speed
(C) To minimize memory access time
(D) Increase frequency

89. Who designed the First Digital computer using the Binary system?
(A) Blaise Pascal
(B) Agutha Ada
(C) Isaac Newton
(D) Dr. Sakunthala Devi

90. Give the name of the first Operating system for Personal Computers:
(A)Linux
(B)Windows 3.2
(C) CP/M 
(D) Disk Operating System

91. Which of the following preposition is a tautology?
(A) pvq->p
(B) p->(q->p)
(C) pv(q->p )
(D) None of these

92. p -> q -> r is equivalent to :
(A) p -> q -> r
(B) p ->( q -> r)
(C) pv(q-> r)
(D) None of These

93. Why do we go for Normalization of Data Bases?
(A) To avoid the repetitions
(B) To prevent fragmentation
(C) Avoid redundancy
(D) To prevent replication

Note : Redundancy means duplication / repetition of data so both A and B are correct

94. Name the component carrying the ALU and Control Unit in Digital Computer:
(A) Microprocessors
(B) Nano chips
(C) MEMS 
(D) Hybrid Computer
www.psctrainer.com
95. Give the name of the Linear list in which elements can be added at ends but not in the /middle: 
(A) Array 
(B) Queue 
(C) Tree 
(D) Circular Queue

96.The switching sed in First generation computer were :
(A) Transistors 
(B) SSI chips
(C) VLSI Ghips  
(D) Vacuum Tubes 

97. The automaton accepting the regular expression of any number of a's is :
(A) a* 
(B)ab*
(C) (a/b)* 
(D)a*b*c*
98.Flip-flop is the basic structure of the device

(A) Hard disk 
(B) Memory
(C) Cells 
(D) Speakers 

99. In C language data type of "3" is :
(A) an integer
(B) a word
(C) a character 
(D) a digit

100.very node "a" in a graph G is adjacent to every node "b" in G, then the graph is ; 
(A) Isolated graph 
(B) Connected graph 
(C) Eulerian graph 
(D) Complete graph 

Compiled by PSCTrainer.com
  More>>
Possible answers are given in blue color...if any mistake comment on this post

28 comments:

FIRU said...

In Question No 61 the correct answer is not (D)8251( Bcz it is USART), the right answer is (A)8253.

FIRU said...

Ref Q. No. 60)
Hexadecimal Equivalent of 1001000010011001 is
9099
Sol:
1001 = 9
0000 = 0
1001 = 9
1001 = 9
(By grouping each binary digit into groups of 4 starting from LSB))

BabithaMP said...

In Question No 60 the correct answer is not 9899,the right answer is 9099

BabithaMP said...

In Question No 60 , the correct answer is not 9899,the right answer is 9099

mayson said...
This comment has been removed by the author.
mayson said...

Q.No.26 &27 answer is screen size

mayson said...

QNo. 75 Answer: Terminal Table(becz it is permanent database )
QNo. 85 Answer: TDMA

mayson said...

QNo. 25 Answer (b)

QNo. 75 answer is Terminal table bcz it is a permanet data base.
QNo. 85 Answer : TDMA

mayson said...

QNo. 25 Answer (b) bcz all are correct.

mayson said...

QNo. 59 . Answer is ASCII Codemile

Faisal qblpindia said...

Hi Babitha and Mayson thanks for your comments ...i published it for others to view and have a further comment on it.

Preethy said...

Hi Friends,

Which is the correct answer of Q97?

mayson said...

Q.97
Answer is a*

Anuroop Vincent said...

Anser for 17 is incorrect.i agree that the virtual memory is physically located in the hard disk.but it is logically located in main memory.(in the pont of view of processor that the whole progarm that is reside in main memory how ever that not in main memory that is the concept of virtual memory)

Anuroop Vincent said...

answer for 97 is a*

Anuroop Vincent said...

Anser for 17 is incorrect.i agree that the virtual memory is physically located in the hard disk.but it is logically located in main memory.(in the pont of view of processor that the whole progarm that is reside in main memory how ever that not in main memory that is the concept of virtual memory)

Priyesh Kupleri said...

answer of Q.99 is Charecter. No 'word' data type in C.

gifty said...

Answer for question number 17 incorrect.Virtual memory means giving an illusion that user's program is completely in main memory.Actually part of it may be reside in secondary memory like hard disk.But logicaaly virtual memory is located in main memory

SHEEBA ANAND said...

cut of mark?

SHEEBA ANAND said...

cut of mark ?

SHEEBA ANAND said...

Cut of mark ?

swati said...

what about the cut off marks?anyone has any idea

jayan said...

cut of mark is 33 and above

jayan said...

cut of mark is 33 and above

jayan said...

cut of mark is 33 and above

Priyesh Kupleri said...

to guess the cut off mark is very difficult. last time it was 35 and very difficult exam. but now also with a lot of confused and wrong questions. out of 75 may be 35-40 cut off mark. what u r thinking? am i right?

jayan said...

ok friend..but this time hsst computer science jr and sr exam is only one exam.so i think the rank list of candidate abov 400.lat time sr and jr was differant exam.and also this time vacancy is too long...then cut off mark 35 is never..i think 30 and below

jayan said...

any one got 40 marks and above?

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