GATE (Graduate Aptitude Test in Engineering) Computer Science: Questions 1280 - 1281 of 2080

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Question 1280

Appeared in Year: 2017 (UGC-NET)

Question

MCQ▾

User level threads are threads that are visible to the programmer and are unknown to the kernel. The operating system kernel supports and manages kernel level threads. Three different types of models relate user and kernel level threads.

Which of the following statements is/are true?

(p)

  1. The Many - to - one model maps many user threads to one kernel thread
  2. The one - to - one model maps one user thread to one kernel thread
  3. The many - to - many model maps many user threads to smaller or equal kernel threads

(q)

  1. Many - to - one model maps many kernel threads to one user thread
  2. One - to - one model maps one kernel thread to one user thread
  3. Many - to - many model maps many kernel threads to smaller or equal user threads (November paper III)

Choices

Choice (4)Response

a.

(p) is false; (q) is true

b.

(p) and (q) are true

c.

(p) is true; (q) is false

d.

(p) and (q) are false

Question 1281

Appeared in Year: 2017 (UGC-NET)

Question

MCQ▾

Consider a schema R (A, B, C, D) and following functional dependencies.

Then decomposition of R into is ________ . (November paper III)

Choices

Choice (4)Response

a.

Dependency preserving and lossless join.

b.

Lossless join but not dependency preserving.

c.

Dependency preserving but not lossless join.

d.

Not dependency preserving and not lossless join.

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