HSST Computer Science Solved Question & Answer Key 2011
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
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
(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
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) 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?
(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:
(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) 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
(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
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
(C) MEMS
(D) Hybrid Computerwww.psctrainer.com
95. Give the name of the Linear list in which elements can be added at ends but not in the /middle:
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
(A) an integer
(B) a word
(C) a character
(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
