ISRO CS 2007

Question 21

What is the name of the technique in which the operating system of a computer executes several programs concurrently by switching back and forth between them?

• Partitioning
• Multi-tasking
• Windowing
• Paging

Question 22

If there are five routers and six networks in intranet using link state routing, how many routing tables are there?

• 1
• 5
• 6
• 11

Question 23

Virtual memory is

• Part of Main Memory only used for swapping
• A technique to allow a program, of size more than the size of main memory, to run
• Part of secondary storage used in program execution
• None of these

Question 24

The set of all Equivalence Classes of a set A of Cardinality C

• is of cardinality 2^c
• have the same cardinality as A
• forms a partition of A
• is of cardinality C²

Question 25

0.75 decimal system is equivalent to ____ in octal system

• 0.60
• 0.52
• 0.54
• 0.50

Question 26

In an SR latch made by cross-coupling two NAND gates, if both S and R inputs are set to 0, then it will result in

• Q = 0, Q\' = 1

• Q = 1, Q\' = 0

• Q = 1, Q\' = 1

• Indeterminate states

Question 27

Identify the correct translation into logical notation of the following assertion. Some boys in the class are taller than all the girls Note: taller (x, y) is true if x is taller than y.

• (∃x)(boy(x) → (∀y)(girl(y) ∧ taller(x, y)))

• (∃x)(boy(x) ∧ (∀y)(girl(y) ∧ taller(x, y)))

• (∃x)(boy(x) → (∀y)(girl(y) → taller(x, y)))

• (∃x)(boy(x) ∧ (∀y)(girl(y) → taller(x, y)))

Question 28

Company X shipped 5 computer chips, 1 of which was defective and company Y shipped 4 computer chips, 2 of which were defective. One computer chip is to be chosen uniformly at a random from the 9 chips shipped by the companies. If the chosen chip is found to be defective, what is the probability that the chip came from the company Y?

• 2/9
• 4/9
• 2/3
• 1/2

Question 29

Ring counter is analogous to

• Toggle Switch

• Latch

• Stepping Switch

• S-R flip flop

Question 30

The output 0 and 1 level for TTL Logic family is approximately

• 0.1 and 5V
• 0.6 and 3.5 V
• 0.9 and 1.75 V
• -1.75 and 0.9 V