UPSC EPFO SOLVED PAPER 2015

Total Questions: 70

1. LAN, WAN and MAN are computer networks covering different areas. Their first alphabets L, W and M respectively stand for

Correct Answer: (c) Local, Wide and Metropolitan
Solution:

LAN, WAN and MAN are computer networks covering different areas. Their first
alphabets L, W and M respectively stand for local, wide and metropolitan.
● LAN (Local Area Network) is a small and single site network.
● MAN (Metropolitan Area Network) connects an area larger than a LAN, but smaller than a WAN, such as a city with dedicated or high performance hardware.
● WAN (Wide Area Network) is a geographically dispersed collection of LANs. The Internet can be considered as WAN as well.

2. A rectangular garden is to be twice as long as its width. If 360 m of fencing including gates will totally enclose this garden, what is the length of the garden?

Correct Answer: (a) 120 m
Solution:

3. The ‘Cloud Computing’ technology refers to

Correct Answer: (c) a distributed computer architecture that provides software, infrastructure and platform just as required by applications users.
Solution:

The cloud computing technology refers to a distributed computer architecture that
provides software, infrastructure and platform just as required by applications/users. Cloud computing is a type of computing that relies on shared computing resources rather than having local servers or personal devices to handle applications.

4. Consider the following statements for Nano technology.

1. It is the technology of creating materials and devices atom by atom
2. Physical properties change at the nanometer scale
3. Chemical properties change at the nanometer scale.
Which of the statements given above are correct(?)

Correct Answer: (d) 1, 2 and 3
Solution:

The correct statements of Nano technology are
● It is the technology of creating materials and devices atom by atom
● Physical properties change at the nanometer scale
● Chemical properties change at the nanometer scale.
So, option (d) is correct

5. The Large Hadron Collider (LHC) used in the CERN project is a particle accelerator located on the border between

Correct Answer: (d) France and Switzerland
Solution:

The Large Hadron Collider (LHC) is the world’s largest and most powerful particle
accelerator. It first started up on 10th September 2008, and remains the latest addition to CERN’s accelerator complex. It lies in a tunnel 27 kilometres (17 mi) in circumference and as deep as 175 metres (574 ft) beneath the France and Switzerland border near Geneva.

6. The method of communication in which transmission can take place in both directions, but happens only in one direction at a time, is called

Correct Answer: (b) Half Duplex
Solution:

The method of communication in which transmission can take place in both directions, but happens only in one direction at a time is called half duplex. When one device transmits information, then other can only receive at the point of time. Walkie-talkie is an example of half duplex channel.

7. A collection of programs that controls how the computer system runs and processes information is called

Correct Answer: (b) Operating system
Solution:

A collection of programs that controls how the computer system runs and
processes information is called operating system. Its function is to provide link between the computer hardware and the user. It provides an environment to run the programs. MS-DOS, Windows XP/2000/98, Unix, Linux etc are the examples of operating system.

8. SMPS is the acronym for

Correct Answer: (c) Switch Mode Power Supply
Solution:

SMPS is the acronym for Switch Mode Power Supply. It is an electronic circuit which converts the power using switching devices that are turned ON and OFF at high frequencies, and storage components such as indicators or capacitors to supply power when the switching device is in its non-conduction state.

9. USB is the acronym for

Correct Answer: (c) Universal Serial Bus
Solution:

USB is the acronym for Universal Serial Bus. It is a common and popular external port available with computers. Normally, two to four USB ports are provided on a PC.

10. In a chess tournament, each of the six players will play with every other player exactly once. What is the number of matches that will be played during the tournament?

Correct Answer: (b) 15
Solution: