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Class 12 · Computer Science worksheetData Communication
CBSE Computer Science. Components of communication, bandwidth and data transfer rate, transfer times, simplex and duplex, circuit and packet switching, wired and wireless media, protocols. Every sheet has 20 questions in three sections and an answer key, and the questions change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The five components of data communication are sender, receiver, message, communication medium and:
- server
- password
- router
- protocol
Answer
(d) protocol
- 2.
What is the protocol SMTP used for?
- sending e-mail to a mail server
- making voice calls over the Internet
- breaking data into packets and delivering them across the Internet
- a direct link between two computers, such as a dial-up connection
Answer
(a) sending e-mail to a mail server
- 3.
Which describes coaxial cable?
- travel in straight lines and need towers in line of sight
- two insulated copper wires twisted together, cheap, used in telephone lines and LANs
- a copper core inside insulation and a braided metal shield, used for cable TV
- work over very short distances and cannot pass through walls, as in a TV remote
Answer
(c) a copper core inside insulation and a braided metal shield, used for cable TV
Section B · short answer
- 4.
Name the five components of data communication.
Answer
Sender, receiver, message, communication medium and protocol.
- 5.
How many seconds does it take to send a 200 KB file over a 100 Kbps link? (1 byte = 8 bits)
Answer
16 seconds
200 × 8 = 1600 Kb; ÷ 100
Section C · long answer
- 6.
Explain the components of data communication with the example of sending a photo from one phone to another.
Answer
The sender is the first phone, the receiver the second, the message is the photo, the communication medium is the wireless link (radio waves) and the networks it passes through, and the protocols are the rules both phones and the network follow to send and receive it.
Fresh sheets for your child
In the app, every Data Communication sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.