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IGCSE CS Unit 2 quiz

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.

These bytes are transmitted across a network and arrive without any errors. Does this parity block use odd or even parity?

a)

odd

b)

even

c)

cannot be determined

2.

What are the benefits of using symmetric encryption?

a)

Uses two keys, so it's more secure than asymmetric encryption.

b)

Faster to compute than asymmetric encryption.

c)

The private key does not need to be shared.

d)

The public key is derived from the private key.

3.

How can checksums help in error detection?

a)

Checksums are primarily used for data compression.

b)

Checksums help in error detection by allowing verification of data integrity through comparison of calculated values.

c)

Checksums can only detect changes in file size.

d)

Checksums are used to encrypt data for security purposes.

4.

What are the typical uses of USB in modern devices?

a)


Wireless internet connectivity

b)


Video streaming to TVs

c)


Data transfer, device charging, and connecting peripherals.

d)

Audio output for speakers

5.

What is a data packet?

a)

A data packet is a formatted unit of data for transmission over a network.

b)

A data packet is a type of computer virus.

c)

A data packet is a physical device used for networking.

d)

A data packet is a software application for data analysis.

6.

Differentiate between serial and parallel transmission.

a)

Serial transmission sends multiple bits at once; parallel transmission sends one bit at a time.

b)

Serial transmission is faster than parallel transmission; parallel transmission is slower.

c)


Parallel transmission is used for long distances; serial transmission is for short distances.

d)

Serial transmission is one bit at a time; parallel transmission is multiple bits at once.

7.

What does USB stand for?

a)

Universal Serial Bus

b)

Universal System Bus

c)

Universal Serial Connection

d)

Unified Serial Bus

8.

What is a parity bit used for?

a)

To format the data for storage.

b)


To increase data transmission speed.

c)

To encrypt the data being sent.

d)

For error detection in data transmission.

9.

If even parity is used for error detection, what will the parity bit be?

a)

0

b)

1

10.

If automatic repeat request (ARQ) is used to transmit a packet, a negative acknowledgement means

a)

the sender never received replay from the receiver

b)

the packet arrive without any errors

c)

the checksums did not match

d)

the packet was dropped by the router.