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Edexcel GCSE Computer Science Topic 3a

Total questions: 25

Worksheet time: 19mins

Name
Class
Date
1.
Convert 128 to binary
a)
10000000
b)
01111110
c)
10000001
d)
11001100
2.
Convert 11111111 to decimal
a)
255
b)
245
c)
235
d)
225
3.
What are the only two numbers you can use in binary?
a)
0 and 1
b)
1 and 2
c)
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
d)
1, 2, 4, 8, 16
4.

What are the disadvantages of using Sign and Magnitude to represent Negative Binary Numbers? (Select Two)

a)

It doesn't represent negative numbers accurately

b)

It takes up an entire digit to represent whether the number is -negative or + positive

c)

There is a possibility of having two 0's

d)

It takes longer for the computer to identify a negative number in two's complement

5.
In a binary number, the bit on the very left is called:
a)
Most significant bit
b)
Least significant bit
c)
Operand
d)
Leftmost parity field
6.
When a binary number's rightmost bit is a one this means:
a)
it represents an odd number
b)
it represents an even number
c)
this byte is corrupted
d)
none of the above
7.
Out of these numbers: 1100 0110, 0111 1111, 0001 1111, 1010 1010, which one is the largest?
a)
1100 0110
b)
0111 1111
c)
0001 1111�
d)
1010 1010
8.

What is the effect of applying a binary left shift 1 on a binary number?

a)

Double the number

b)

Halve the number

c)

Decreases the number by 2

d)

Increases the number by 2

9.

What is the effect of applying a binary right shift 2 on a binary number?

a)

Multiply by 4

b)

Divide by 4

c)

Decreases the number by 4

d)

Increases the number by 4

10.
Convert the hexadecimal number C9 to binary
a)
1100 1001
b)
1100 1000
c)
1100 1010
d)
1100 0101
11.
What letters does hexadecimal use?
a)
A-F
b)
A-D
c)
P-W
d)
A-Z
12.
How many hexadecimal digits is equal to one nibble of binary?
a)
1
b)
2
c)
3
d)
4
13.
How many bits is a nibble made up of?
a)
1
b)
2
c)
3
d)
4
14.
What does 'A' equal in denary?
a)
8
b)
9
c)
10
d)
11
15.
What does 'F' equal in denary?
a)
14
b)
15
c)
16
d)
17
16.
What is the ASCII code for ... A?
a)
65
b)
56
c)
97
d)
79
17.
ASCII stands for...
a)
The American Standard Code for Information Interchange
b)
The Authentic Style Code for Information Interchange
c)
The American System Control for Information Interchange
d)
The Authentic System Coding for Information Interchange
18.

JPEG, GIF & PNG are typical file formats for what type of graphic?

a)

Bitmap

b)

Vector

19.

A bitmap image is made up of

a)

Pixels

b)

Colours

c)

Sounds

d)

Samples

20.
Increasing the colour depth means…
a)
A bigger range of colours can be used for each pixel
b)
More pixels are in the image.
c)
More colours are in the image.
d)
Darker colours
21.
How many colours can be used for each pixel if the colour depth is 4 bit?
a)
4 colours
b)
5 colours
c)
15 colours
d)
16 colours
22.
The number of pixels per inch in an image is known as the
a)
Dimensions
b)
Colour depth
c)
Resolution
d)
Megapixels
23.
How could you reduce the file size of an image?
a)
Reduce the numbr of colours used per pixel (colour depth)
b)
Reduce the dimensions of the image.
c)
Compress the file using a lossy compression file type.
d)
All of these
24.
Define the term "Colour Depth"
a)
The number of bits used per pixel (BPP).
b)
The number of colours used in an image.
c)
The number of pixels per inch (PPI).
d)
The total number of pixels in an image.
25.

In order for sound to be stored in a computer it must be converted to...

a)

Analogue

b)

Digital

c)

Buddhism

d)

JPEG

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