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Operating system questions

(1) The use of __________ works on the principle of locality.

(A) Cache memory
(B) Interrupts
(C) Polling
(D) DMA

(2) Consider a computer system with 6 tape drives and n processes completing for them. What is the maximum value of n for the system to be deadlock free assuming each processes may need 3 tape drives?

(A) 3
(B) 2
(C) 4
(D) 7

(3) When size of the memory is increased the page replacement policy that sometimes leads to more page faults is

(A) FIFO
(B) Optimal
(C) LRU
(D) None of the above

Probability - aptitude test

1) Three unbiased coins are tossed. What is the probability of getting at least 2 tails?
a) 0.75
b) 0.5
c) 0.25
d) 0.2

2) Tickets numbered 1 to 50 are mixed and one ticket is drawn at random. Find the probability that the ticket drawn has a number which is a multiple of 4 or 7?
a) 9/25
b) 9/50
c) 18/25
d) None of these

What is CMM?
CMM stands for Capability Maturity Model.
It is a development model used to develop and refine an organization's software development process.
Uses of CMM
It is used as a benchmark for assessing different organizations for equivalent comparison.
It can be used to assess an organization against a scale of five process maturity levels.
There are five levels of CMM:

1. Initial
2. Repeatable
3. Defined
4. Managed
5. Optimizing

Each level ranks the organization according to its standardization of processes.

Levels of CMM

Level I - Initial
This level is a basis for comparison with the next levels.
At this stage, the conditions are not stable for the development of quality software.
The results of any software project here absolutely depend on the manager and the programmer's experience. If managers or programmers leave the company, the quality of product will decrease.
Level II- Repeatable
At this level, some processes are repeatable; possibly with consistent results.
The project management technologies are introduced. This project planning and management is dependent on experience and there exists a special quality management group.
At critical times, the process tends to roll back to the initial level.
Level III - Defined
At this stage, there are sets of defined and documented standard processes established.
These standard processes are used to establish consistency of process performance across the organization.
Level IV - Managed
At this level, an organization monitors and controls its own process through data collection and analysis.
It uses process metrics, management can effectively control the AS-IS process for software development.
Level V - Optimizing
At this level, the focus is on continually improving process performance through both incremental and innovative technological changes.
Here, the processes are constantly being improved through feedback from current processes and introducing innovative processes to provide organization's needs.

2.A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:

A. 145º
B. 150º
C. 155º
D. 160º

Clock - General Questions

1.An accurate clock shows 8 o'clock in the morning. Through how may degrees will the hour hand rotate when the clock shows 2 o'clock in the afternoon?

A. 144º
B. 150º
C. 168º
D. 180º