Case Based MCQ Questions

Computer Science - Class 12
Chapter 10 - Computer Networks

## (D) HR Center

The server should be installed in the building which has the highest number of computers as it will decrease the cabling cost for most of the computers as well as increase the efficiency of the maximum computers in the network.

Checking the options

• (A) Law Block - Number of computers is 15.
• (B) Business block - Number of computers is 25
• (C) Technology block - Number of computers is 40
• (D) HR Center - Number of computers is 115

The HR Center has the highest number of computers in the network.

So, the correct answer is (D)

## (D) Repeater

Checking the options

• (A) Switch - It plays a central role in a Local Area Network. It is used to connect multiple computers or communicating devices.
• (B) Hub  -  It is a network device used to connect different devices through wires. The limitation of Hub is that if data from two devices come at the same time, they will collide.
• (C) Router - It is a network device that can receive the data , analyse it and transmit it to other networks.
• (D) Repeater - It is a device used to regenerate signals .

Since switch is used to connect multiple computers.

## (D) None of these

Checking the options

• (A) LAN - The geographical area covered by a LAN can range from a single room , a floor, an office having one or more buildings in the same premise, laboratory, a school to a college or university campus. Its range is 1 km.
• (B) MAN  - It covers a larger geographical area like a city or a town . Its range is 30 - 40 km.
• (C) WAN - It connects computers and other LANs and MANs , which are spread across different geographical locations of a country or in different countries or continents.
• (D) None of these

To connect the university’s admission office in the closest big city, which is more than 250  km from university, the network used will be WAN.

So, the correct answer is (C)

## (D) Technology Block to HR Centre

A repeater may be placed between 2 buildings when the distance between the 2 buildings is more than 70 m.

Checking the options

• (A) Law Block to Business Block  - The distance between the 2 blocks is under 70 m , so a repeater is not needed
• (B) Law Block to Technology Block  - The distance between the 2 blocks is more than 70 m, so a repeater should be placed between the 2 blocks.
• (C) Business Block to Technology Block  - The distance between the 2 blocks is under 70 m , so a repeater is not needed.
• (D) Technology Block to HR Centre - The distance between the 2 blocks is under 70 m , so a repeater is not needed.

Since the distance between Law Block and Technology block is 80m, a repeater is used between them.

So, the correct answer is (B)

## (C) Telephone line

Checking the options

• (A) Satellite - High speed but very expensive
• (B) Lease line - High speed but expensive
• (C) Telephone line - low speed and cost effective
• (D) Broadband - High speed and cost effective

On comparing all the 4 options, Broadband provides high-speed internet accessibility and is cost-effective.

So, the correct answer is (D)

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

### Transcript

#### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.