ISRO CS 2007

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Question 1

A task in a blocked state

  • is executable

  • is running

  • must still be placed in the run queues

  • is waiting for some temporarily unavailable resources

Question 2

Round Robin schedule is essentially the pre-emptive version of

  • FIFO

  • Shortest job first

  • Shortest remaining time

  • Longest remaining time

Question 3

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 4

Consider a set of n tasks with known runtimes r1, r2....rn to be run on a uniprocessor machine. Which of the following processor scheduling algorithms will result in the maximum throughput?

  • Round Robin

  • Shortest job first

  • Highest response ratio next

  • first come first served

Question 5

Feedback queues

  • are very simple to implement

  • dispatch tasks according to execution characteristics

  • are used to favour real time tasks

  • require manual intervention to implement properly

Question 6

On a system using non-preemptive scheduling, processes with expected run times of 5, 18, 9 and 12 are in the ready queue. In what order should they be run to minimize wait time?

  • 5, 12, 9, 18

  • 5, 9, 12, 18

  • 12, 18, 9, 5

  • 9, 12, 18, 5

Question 7

Bit stuffing refers to

  • inserting a 0 in user stream to differentiate it with a flag

  • inserting a 0 in flag stream to avoid ambiguity

  • appending a nipple to the flag sequence

  • appending a nipple to the use data stream

Question 8

Assume that each character code consists of 8 bits. The number of characters that can be transmitted per second through an synchronous serial line at 2400 baud rate, and with two stop bits is

  • 109

  • 216

  • 300

  • 219

Question 9

IEEE 802.11 is standard for

  • Ethernet

  • Bluetooth

  • Broadband Wireless

  • Wireless LANs

Question 10

An Ethernet hub

  • functions as a repeater

  • connects to a digital PBX

  • connects to a token-ring network

  • functions as a gateway

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