ISRO CS 2015

Question 1

If in a software project the number of user input, user output, enquiries, files and external interfaces are (15, 50, 24, 12, 8), respectively, with complexity average weighing factor. The productivity if effort = 70 percent-month is

• 110.54
• 408.74
• 304.78
• 220.14

Question 2

Which of the given number has its IEEE-754 32 bit floating point representation as 0 10000000 110 0000 0000 0000 0000 0000

• 2.5
• 3.0
• 3.5
• 4.5

Question 3

The range of integers that can be represented by an n bit 2’s complement number system is:

• - 2^{n - 1} to 2^{n - 1} - 1
• - (2^{n - 1} - 1) to (2^{n - 1} - 1)
• - 2^{n - 1} to 2^{n - 1}
• - (2^{n - 1} + 1) to (2^{n - 1} - 1)

Question 4

How many 32K X 1 RAM chips are needed to provide a memory capacity of 256K-bytes?

• 8
• 32
• 64
• 128

Question 5

A modulus -12 ring counter requires a minimum of

• 10 flip-flops

• 12 flip-flops

• 8 flip-flops

• 6 flip-flops

Question 6

The complement of the Boolean expression AB ( B\'C + AC ) is

• ( A\' + B\' ) + ( B + C\' )( A\' + C\' )
• ( A\' + B\' ) + ( BC\' + A\'C\' )
• ( A\' + B\' )( B + C\') + ( A + C\' )
• ( A + B )( B\' + C )( A + C )

Question 7

The code which uses 7 bits to represent a character is

• ASCII
• BCD
• EBCDIC
• Gray

Question 8

If half adders and full adders are implemented using gates, then for the addition of two 17 bit numbers (using minimum gates) the number of half adders and full adders required will be

• 0, 17
• 16, 1
• 1, 16
• 8, 8

Question 9

Minimum number of multiplexers required to realize the following function,f = A\'B\'C + A\'B\'C\' Assume that inputs are available only in true form and Boolean constant 1 and 0 are available.

• 1
• 2
• 3
• 7

Question 10

The number of 1\'s in the binary representation of (3*4096 + 15*256 + 5*16 + 3) are:

• 8
• 9
• 10
• 12