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AQA A Level Computer Science

Authored by Paul Baker

Computers

12th Grade

Used 46+ times

AQA A Level Computer Science
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70 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Which regular expression matches the FSM?

a?bc(dc)*

a|b(cd)+

a+bc(dc)?

a(b|c)d*c*

2.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Select the strings that are matched by the regular expression:

a(b|c)?d

abcbcbcbcd

acd

ad

acccd

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The Caesar cipher is an example of what type of cipher?

Substitution cipher

Transposition cipher

Public key encryption

Vernam cipher

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The letter m has an ascii code of 1101101. As part of a Vernam cipher, the key 0101001 is applied to that letter. What is the resulting ciphertext?

1000100

0111011

1100101

1101001

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The bit pattern 0110001 is sent with an even parity bit in the MSB position.

Which of these is the bit pattern receivedt?

00110001

10110001

01100011

01100010

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The bitmap image of the lemming is 6 pixels by 10 pixels. There are 16 available colours for each pixel. Calculate the file size of the image (not including any metadata) in bytes.

30

120

22.5

60

7.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Which of these are advantages of vector graphics over bitmap graphics?

Can be rescaled without distortion

(Usually) a smaller file size

Ideal for photographic images

Each pixel can be modified individually

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