Operating System Multiple choice Questions and Answers-UGC NET computer science question paper

1.	Interrupts which are initiated by an instruction are
a.	Internal
b.	External
c.	Hardware
d.	Software

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Answer: (d).Software)

2.	Resources are allocated to the process on non-sharable basis is
a.	mutual exclusion
b.	hold and wait
c.	no pre-emption
d.	circular wait

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Answer: (a).mutual exclusion)

3.	If the disk head is located initially at 32, find the number of disk moves required with FCFS if the disk queue of I/O blocks requests are 98, 37, 14, 124, 65, 67.
a.	239
b.	310
c.	321
d.	325

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Answer: (c).321)

4.	Given memory partitions of 100 K, 500 K, 200 K, 300 K and 600 K (in order) and processes of 212 K, 417 K, 112 K, and 426 K (in order), using the first-fit algorithm, in which partition would the process requiring 426 K be placed ?
a.	500 K
b.	200 K
c.	300 K
d.	600 K

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Answer: (d).600 K)

5.	The problem of indefinite blockage of low-priority jobs in general priority scheduling algorithm can be solved using :
a.	Parity bit
b.	Aging
c.	Compaction
d.	Timer

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Answer: (b).Aging)

6.	Which of the following memory allocation scheme suffers from external fragmentation ?
a.	Segmentation
b.	Pure demand paging
c.	Swapping
d.	Paging

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Answer: (a).Segmentation)

7.	Match the following : List – I List – II a. Critical region 1. Hoares Monitor b. Wait/signal 2. Mutual exclusion c. Working set 3. Principal of locality d. Dead lock 4. Circular wait Codes : a b c d
a.	2 1 3 4
b.	1 2 4 3
c.	2 3 1 4
d.	1 3 2 4

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Answer: (a).2 1 3 4)

8.	Which of the following features will characterize an OS as multiprogrammed OS ? (a) More than one program may be loaded into main memory at the same time. (b) If a program waits for certain event another program is immediately scheduled. (c) If the execution of a program terminates, another program is immediately scheduled.
a.	(a) only
b.	(a) and (b) only
c.	(a) and (c) only
d.	(a), (b) and (c) only

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Answer: (d).(a), (b) and (c) only)

9.	A thread is a light weight process. In the above statement, weight refers to
a.	time
b.	number of resources
c.	speed
d.	All the above

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Answer: (b).number of resources)

10.	Consider a system having m resources of the same type. These resources are shared by 3 processes A, B and C which have peak demands of 3, 4 and 6 respectively. For what value of m deadlock will not occur ?
a.	7
b.	9
c.	10
d.	13