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Q:

In how many ways a committee, consisting of 5 men and 6 women can be formed from 8 men and 10 women?

A) 11670	B) 12000
C) 11760	D) 20050

Answer & Explanation Answer: C) 11760

Explanation:

Required number of ways= $(8 C_{5} \times 10 C_{6})$ = ( $8 C_{3} \times 10 C_{4}$ )= 11760.

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Filed Under: Permutations and Combinations

Q:

The PS command prints the process status for only some of the running processes.

A) TRUE

B) FALSE

Answer & Explanation Answer: B) FALSE

Explanation:

The PS command prints the process status for some or all of the running processes

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Subject: Operating Systems
Exam Prep: GATE

Q:

In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?

A) 209	B) 290
C) 200	D) 208

Answer & Explanation Answer: A) 209

Explanation:

We may have (1 boy and 3 girls) or (2 boys and 2 girls) or (3 boys and 1 girl) or (4 boys).

Required number of ways = $(6 C_{1} * 4 C_{3}) + (6 C_{2} * 4 C_{2}) + (6 C_{3} * 4 C_{1}) + 6 C_{4}$

= $(6 C_{1} * 4 C_{1}) + (6 C_{2} * 4 C_{2}) + (6 C_{3} * 4 C_{1}) + 6 C_{2}$ = 209.

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Filed Under: Permutations and Combinations

Q:

Which among the following is not aprocess state in unix?

A) Running	B) Runnable
C) Zombie	D) Stopped

Answer & Explanation Answer: B) Runnable

Explanation:

The process states of unix are running,Zombie,stopped,Waiting.

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Filed Under: Operating Systems
Exam Prep: GATE

Q:

From a group of 7 men and 6 women, five persons are to be selected to form a committee so that at least 3 men are there on the committee. In how many ways can it be done?

A) 564	B) 735
C) 756	D) 657

Answer & Explanation Answer: C) 756

Explanation:

We may have (3 men and 2 women) or (4 men and 1 woman) or (5 men only).

Required number of ways= $(7 C_{3} * 6 C_{2}) + (7 C_{4} * 6 C_{1}) + 7 C_{5}$ = 756.

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Filed Under: Permutations and Combinations

Q:

getppid() system call is used to bias the existing priority of a process

A) TRUE

B) FALSE

Answer & Explanation Answer: B) FALSE

Explanation:

It is used to get parent process identifier

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Subject: Operating Systems
Exam Prep: GATE

Q:

Which among the following is a system call used for process management

A) fork()	B) exec()
C) getppid()	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

All the above listed are the System calls for process management

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Filed Under: Operating Systems
Exam Prep: GATE
Job Role: Software Architect

Q:

main()

{

fork();

printf(“Hello World!”);

}

Output for the above unix program is

A) Hello World!	B) Hello World!Hello World!
C) Hello World	D) None

Answer & Explanation Answer: B) Hello World!Hello World!

Explanation:

The fork creates a child that is a duplicate of the parent process. The child begins from the fork().All the statements after the call to fork() will be executed twice.(once by the parent process and other by child). The statement before fork() is executed only by the parent process

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Filed Under: Operating Systems
Exam Prep: GRE

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