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Informatics Practices XII C

1. Which communication channel(s) is/are suitable in each of the following situations:

a. Setting up a LAN

b. Transfer of data from a laptop to a mobile phone.

c. Transfer of data from one mobile phone to another.

d. Creating a remote control that can control multiple devices in a home.

e. Very fast communication between two offices in two different countries.

f. Communication in a hilly area

g. Communication within a city and its vicinity where cost of cabling is too high.

2. (a) What is a computer network? What are its advantages?

(b) What is meant be communication channels? Give two examples of guided media and

two examples of unguided media.

3. Differentiate (with examples wherever possible) between :

a. Hub and Switch b. Guided and Unguided media

4. Differentiate between :

(a) radio waves and micowaves (b) Bluetooth and satellite

5. Write the syntaxes of if-else, and switch case statements in java. Explain how each works.

State one sample program for each.

6. Write the syntaxes of for, while and do-while statements in java. Explain how each works.

State one sample program for each.

(Date of submission- First week of June2015)


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