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    • ISRO CS 2007

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    Question 1

    A task in a blocked state

    • A

      is executable

    • B

      is running

    • C

      must still be placed in the run queues

    • D

      is waiting for some temporarily unavailable resources

    Question 2

    Round Robin schedule is essentially the pre-emptive version of

    • A

      FIFO

    • B

      Shortest job first

    • C

      Shortest remaining time

    • D

      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?

    • A

      Partitioning

    • B

      Multi-tasking

    • C

      Windowing

    • D

      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?

    • A

      Round Robin

    • B

      Shortest job first

    • C

      Highest response ratio next

    • D

      first come first served

    Question 5

    Feedback queues

    • A

      are very simple to implement

    • B

      dispatch tasks according to execution characteristics

    • C

      are used to favour real time tasks

    • D

      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?

    • A

      5, 12, 9, 18

    • B

      5, 9, 12, 18

    • C

      12, 18, 9, 5

    • D

      9, 12, 18, 5

    Question 7

    Bit stuffing refers to

    • A

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

    • B

      inserting a 0 in flag stream to avoid ambiguity

    • C

      appending a nipple to the flag sequence

    • D

      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

    • A

      109

    • B

      216

    • C

      300

    • D

      219

    Question 9

    IEEE 802.11 is standard for

    • A

      Ethernet

    • B

      Bluetooth

    • C

      Broadband Wireless

    • D

      Wireless LANs

    Question 10

    An Ethernet hub

    • A

      functions as a repeater

    • B

      connects to a digital PBX

    • C

      connects to a token-ring network

    • D

      functions as a gateway

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