ISRO : Scientist/Engineer - SC, 2011 Solved Question Paper

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Computer Science -2011
1. A context model of a software system can be shown by drawing a
a LEVEL-0 DFD
b LEVEL-1 DFD
c LEVEL-2 DFD
d LVEL-3 DFD
2.An example of poly-alphabetic substitution is
a P-box
b S-box
c Ceaser cipher
d Vigenere cipher
3. If node A has three siblings and B is parent of A, what is the degree of A?
a 0
b 3
c 4
d 5
4. The IEEE standard for WiMax technology is
a IEEE 802.16
b IEEE 802.36
c.IEEE 812.16
d IEEE 806.16
5. Which type of DBMS provides support for maintaining several versions of the same entity?
a Relational Data Base Management Systems
b Hierarchical
c Object Oriented Data base Management systems
d Network
6. A system is having 8 M bytes of video memory for bit- mapped graphics with 64-bit colour. What is the maximum resolution it can support?
a 800x 600
b 1024 x768
c 1280 x1024
d 1920 x1440
7.what is the meaning of RD signal in intel 8151A?
a  read(when it is low)
b read(when it is high)
c write(when it is low)
d read and write(when it is high)
8.If the page size in a 32 bit machine is 4K bytes then the size of page table is
a 1M bytes
b 2M bytes
c 4M bytes
d 4K bytes
9.A processor takes 12 cycles to complete an instruction 1.The corresponding pipelined processor uses 6 stages with the execution times of 3,2,5,4,6 and 2 cycles respectively.what is the asymptotic speedup assuming that a very large number speedup assuming that a very large number of instructions are to be executed?
a 1.83
b 2
c 3
d 6
10.The in order traversal of a tree resulted in FBGADCE.Then the pre order traversal of that tree would result in
a FGBDECA
b ABFGCDE
c BFGCDEA
d AFGBDEC
11.which one of the following is true
a R^S=(RUS)-[(R-S)U(S-R)]
b RUS=(R^S)-[(R-S)U(S-R)]
c R^S=(RUS)-[(R-S)^(S-R)]
d R^S=(RUS)U(R-S)
12.The above figure represents which one of the following UML diagram for a single send session of an online chat system.
a package diagram
b activity diagram
c class diagram
d sequence diagram
13.Which  'Normal Form' is based on the concept of 'full functional dependency' is
a first normal form
b second normal form
c third normal form
d fourth normal form
14.In boolean algebra,rule(X+Y)(X+Z)=
a Y+XZ
b X+YZ
c XY+Z
d XY+Y
15 How many 3 to 8 decorders with a chip having enable pin are needed to construct a 6 to 64 decorder without using any other logic gates?
a 7
b 8
c 9
d 10
16 In which layer of network architecture the secured socket layer (SSL) is used?
a physical layer
b session layer
c application layer
d presentation layer
17 What is the bit rate of a video terminal unit with 80 character/line,8 bits/character and horizontal sweep time of 100 muesecond(including 20 muesecond of retrace time)?
a 8 mbps
b 6.4 mbps
c 0.8 mbps
d 0.64 mbps
18 Black box software testing method focuses on the
a boundary condition of the software
b control structure of the software
c Functional Requirement of the Software
d Independent paths of Software
19. How many edges are there in a forest with v verticles and k components?
a (v+1) -k
b (v+1)/2 -k
c v-k
d v+k
20. If A and B are square matrices of the same order and A is symmetric, then BTAB is
a Skew symmetric
b Symmetric
Orthogonal
Idempotent
21 Find the memory address of the next instruction executed by the microprocessor (8086), when operated in real mode for CS  = 1000 and IP=E000
a 10E00
b 1E000
c F000
d 1000E
22. A fast wide SCS-II disk drive spines at 7200 RPM, has a sector size of 512 bytes, and holds 160 sectors per track. Estimate the sustained transfer rate of this drive.
a 576000 Kilobytes/sec
b 9600 Kilobytes/sec
c 4800 Kilobytes/sec
d 192000 Kilobytes/sec
23. Two control signals in microprocessorwhich are related to Direct Memory Access (DMA) are
a INTR & INTA
b RD & WR
c S0 &S1
d HOLD & HLDA
24. Consider the following pseudocode.
x:=1;
i:=1;
while (x<500)
begin  x:=2x;
i:=i+1;
end;
what is the value of i at the end of the pseudocode?
a 4
b 5
c 6
d 7
25 If the microcomputer operates at 5 MHz with an 8-bit bus and a newer version operates at 20 MHz with a 32- bit bus, the maximum speed -up possible approximately will be
a  2
b  4
c  8
d  16
26 The search concept used in associative memory is
a Parallel Search
b Sequential search
c Binary search
d Selection search
27 which variable does not drive a terminal string in the grammer
S-> AB
A->a
B->b
B->C

a  A
b  B
c  C
d  S


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