GATE (Graduate Aptitude Test in Engineering) Computer Science: Questions 1892 - 1895 of 2080

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Question 1892

Question

MCQ▾

Consider three CPU-intensive processes, which require 15,25 and 35 time units and arrive at times 0,4 and 8, respectively. How many context switches are needed if the operating system implements a shortest remaining time first scheduling algorithm? Do not count the context switches at time zero and at the end.

Choices

Choice (4)Response

a.

3

b.

1

c.

2

d.

4

Question 1893

Question

MCQ▾

Let G be a group with 18 elements. Let L be a subgroup of G. It is known that and that the size of L is at least 8. The size of L is ________.

Choices

Choice (4)Response

a.

9

b.

18

c.

7

d.

6

Question 1894

Question

Match List-Ⅰ List-Ⅱ▾

Match the following port numbers with their uses:

List-Ⅰ (Column-I)List-Ⅱ (Column-II)
(A)

119

(i)

Remote Login

(B)

23

(ii)

USENET news

(C)

25

(iii)

E-mail

(D)

80

(iv)

World Wide Web

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (iv)
  • (ii)
  • (iii)
  • (i)

b.

  • (iii)
  • (ii)
  • (i)
  • (iv)

c.

  • (ii)
  • (i)
  • (iii)
  • (iv)

d.

  • (i)
  • (iii)
  • (iv)
  • (ii)

Question 1895

Question

MCQ▾

The following table has two attributes A and C where A is the primary key and C is the foreign key referencing A with on-delete cascade.

Table Has Two Attributes a and C Where a is the Primary Key and C
AC
1242
3342
4233
5812
2712
9058
6042

The set of all tuples that must be additionally deleted to preserve referential integrity when the tuple (12,42) is deleted is:

Choices

Choice (4)Response

a.

and

b.

and

c.

and

d.

and

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