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Mission ECIL Subjects Revision Test-4 (OS & Database )

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Question 1

RR scheduler maintains larger quantum then choose the wrong statement from the following.

Question 2

Assume time quantum of RR scheduler is greater than longest CPU burst time of all processes.
Which of the following is correct?

Question 3

What is the role of short term scheduler?

Question 4

Which of the following statements is correct for deadlock avoidance algorithm

Question 5

Which of the following is not the disc scheduling algorithm.

Question 6

What do you understand by busy waiting?

Question 7

We use Bernstein’s algorithm using concept of read-set and write-set to determine

Question 8

In a relation r, if every attribute is prime but key may not be simple then the relations is in.

Question 9

Consider the following characteristics of a disk system.
• 10 GB disk rotates at 10,000 rpm
• Data transfer rate of 107 bytes/sec
• Average seek time is 8 ms
• Block size is 32 KB
What is the average service time to retrieve a single disk block from a random location on the disk (in ms)?

Question 10

Suppose that we have the following three tuples in a legal instance of a relation schema S with three attributes ABC (listed in order): (1,2,3), (4,2,3), and (5,3,3).Which of the following dependencies can you infer does not hold over schema S?

Question 11

Consider a B+ tree in which the maximum number of keys in a node is 7. Find the number of keys(minimum) in non-root node.

Question 12

A secondary index on a non candidate key

Question 13

Which command undo all the updates performed by the SQL in the transaction?

Question 14

Which of the following operators is used to search a specified pattern in a column?

Question 15

Consider the following schedule.
r1(x), r1(y),w1(x),w2(x),w3(x)
Which of the following is true regarding the given schedule.
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Jan 13GATE & PSU CS

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Anand PandeyAnand PandeyMember since Aug 2017
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