ISRO Scientist or Engineer Computer Science 2014


For the following questions answer them individually

Question 1

Consider a 33 MHz CPU based system. What is the numberof wait states required ifit is interfaced with a 60ns memory? Assume a maximum of 10ns delay for additional circuitry like buffering and decoding.

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Question 2

The number of states required by a Finite State Machine, to simulate the behaviour of a computer with a memory capable of storing ‘m’ words, with each word being ‘n’ bits long is

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Question 3

What is the output of the following C program?
#include <stdio.h>
#define SQR(x) (x*x)

int main()
int a;
int b = 4;

a = SQR(b + 2);
printf("%d \n", a);
return 0;

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Question 4

Consider the following pseudo-code
while (m < n)
if(x > y) and (a > b) then
a = a + 1
y = y - 1
end if
m = m + 1
end while
What is the cyclomatic complexity of the above pseudo-code?

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Question 5

What is the number of steps required to derive the string ((() ()) ()) for the following grammar.
$$S \rightarrow SS$$
$$S \rightarrow (S)$$
$$S \rightarrow ε$$

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Question 6

The process of modifying IP address information in IP packet headers while in transit across a traffic routing deviceis called

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Question 7

What does a pixel mask mean?

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Question 8

In the standard IEEE 754 single precision floating point representation,there is 1 bit for sign, 23 bits for fraction and 8 bits for exponent. Whatis the precision in terms of the numberof decimal digits?

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Question 9

Let R be the radius of a circle. Whatis the angle subtended by an arcof length R at the centre of the circle?

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Question 10

The number of logical CPUs in a computer having two physical quad-core chips with hyperthreading enabled is ..................

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