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Q:

In a race, the odd favour of cars P,Q,R,S are 1:3, 1:4, 1:5 and 1:6 respectively. Find the probability that one of them wins the race.

A) 319/420	B) 27/111
C) 114/121	D) 231/420

Answer & Explanation Answer: A) 319/420

Explanation:

$P (P) = \frac{1}{4}, P (Q) = \frac{1}{5}, P (R) = \frac{1}{6}, P (S) = \frac{1}{7}$
All the events are mutually exclusive hence,

Required probability = P(P)+P(Q)+P(R)+P(S)

$\frac{1}{4} + \frac{1}{5} + \frac{1}{6} + \frac{1}{7}$ = $\frac{319}{420}$

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Filed Under: Probability

Q:

Frame relay is a packet switching technology operates in the data link layer

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

Frame relay is a packet switching technology. It will operate in the data link layer.

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Subject: Networking
Job Role: Network Engineer

Q:

What is a drawback of MVT?

Answer

1) ability to support multiple processors
2) virtual storage
3) source level debugging

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Subject: Operating Systems

Q:

What is pre-emptive and non-preemptive scheduling?

Answer

Preemptive scheduling: The preemptive scheduling is prioritized. The highest priority process should always be the process that is currently utilized.

Non-Preemptive scheduling: When a process enters the state of running, the state of that process is not deleted from the scheduler until it finishes its service time.

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Subject: Operating Systems

Q:

What is a daemon?

Answer

Daemon is a program that runs in the background without user’s interaction. A daemon runs in a multitasking operating system like UNIX. A daemon is initiated and controlled by special programs known as ‘processes’.

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Subject: Operating Systems

Q:

Explain the meaning of mutex.

Answer

Mutex is the short form for ‘Mutual Exclusion object’. A mutex allows multiple threads for sharing the same resource. The resource can be file. A mutex with a unique name is created at the time of starting a program. A mutex must be locked from other threads, when any thread that needs the resource. When the data is no longer used / needed, the mutex is set to unlock.

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Subject: Operating Systems

Q:

Explain the concept of the Distributed systems?

Answer

Distributed systems work in a network. They can share the network resources, communicate with each other.

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Subject: Operating Systems

Q:

What is Memory-Management Unit (MMU)?

Answer

Hardware device that maps virtual to physical address. In MMU scheme, the value in the relocation register is added to every address generated by a user process at the time it is sent to memory.

->The user program deals with logical addresses; it never sees the real physical addresses

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Subject: Operating Systems

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