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Edexcel GCSE Computer Science Topic 3

Total questions: 52

Worksheet time: 33mins

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

26.

Sound waves must be samples to create digital sound. A sample is...

a)

a measure of amplitude at a point in time

b)

the number of samples taken per second

c)

the file size of an image

27.

When recording sound, the number of samples recorded per second is called the:

a)

sample rate

b)

sample resolution

c)

colour depth

d)

File size

28.

To calculate the size of a sound file:

a)

colour depth * resolution

b)

sample rate * sample resolution * length in seconds

c)

number of samples * sample rate

d)

sample resolution squared

29.

Increasing the sample rate of a recording will result in...

a)

Higher-quality sound recording

b)

Increased file size

c)

Better compression

d)

Higher colour depth

e)

Increased amplitude

30.
how many bits are in 2 kilobytes?
a)
2
b)
2 x 1024 x 8 = 16384
c)
2 x 1024 = 2048
31.
A byte is
a)
8 bits
b)
4 bits
32.
In computing, a bit is
a)
8 bytes
b)
a single    0 or 1     on or off
33.
How many megabytes are in 1 gigabyte?
a)
1024
b)
1
c)
1024 x 10 = 10240
34.
how many megabytes are in 4 gigabytes?
a)
4
b)
4 x 1024 = 4096
c)
1024
35.
A gigabyte consists of 1024:
a)
megabytes
b)
terabytes
c)
kilobytes
d)
nibbles
36.
The following is a correct order of units of storage from lowest to highest:
a)
a bit, a nibble, a byte, a kilobyte, a megabyte, a gigabyte, a terabyte
b)
a bit, a byte, a nibble, a kilobyte, a megabyte, a gigabyte, a terabyte
c)
a bit, a nibble, a byte, a megabyte, a kilobyte, a gigabyte, a terabyte
d)
a byte, a bit, a nibble, a megabyte, a kilobyte, a gigabyte, a terabyte
37.
What does Lossy Compression do to files?
a)
Increases the file size and keeps the same quality
b)
Eliminates no information at all
c)
Decreases the file size and keeps the same quality
d)
Eliminates unnecessary information in a file to reduce file size
38.
What is Lossless Compression?
a)
No information is lost but file size is increased
b)
There is no loss of information at all after compression
c)
Files which have the exact same data after compression
d)
Compression involves an algorithm
39.
What type of compression does the ZIP format use?
a)
Lossy
b)
Lossless
40.
What type of compression would you use to compress a video?
a)
Lossy
b)
Lossless
41.
What type of compression would you use to compress a text file?
a)
Lossy
b)
Lossless
42.
Which of the following are not in a compressed format?
a)
JPEG
b)
MPEG
c)
Bitmap
d)
MP3
43.
Uncompressed audio and video files require less memory than compressed files....
a)
True
b)
False
44.

What is the correct Run-length encoding for the data: cccmmmmmsssssdcccccc

a)

3c5m5s1d6c

b)

c3m5s5d1c6

c)

cmsdc35516

d)

cccmmmmmsssssdcccccc

45.
When is Run Length Encoding used?
a)
When we want to compress patterns of data
b)
When we want to decompress patterns of data
c)
When we want to encode running videos
46.

Convert "GJGB" cipher-text back into plain text using the key: 1

a)

FIFA

b)

HKHC

c)

EHEZ

d)

JMER

47.

"Bletchley Park" is plain text, what would be the cipher text with key of -10.

a)

Rbujsxbuo Fqhb

b)

Rhujsxbuo Fqha

c)

Rbujsxbuo Fqha

d)

Rrujsxbuo Fqha

48.
A Primary Key is a code that uniquely identifies a _____________ in a Database.
a)
Record 
b)
Field 
c)
Text 
d)
Number
49.
A _________ is a computerized filing system that is used to organize and maintain a collection of information for future use.
a)
Query
b)
Report
c)
Database 
d)
Spreadsheet
50.
In a database table, rows are called __________
a)
Field
b)
Record
c)
Primary Key
51.
Tables are set up to contain columns and rows of information. In a database table, the columns are called __________.
a)
Cell
b)
Field
c)
Column
d)
Record
52.

What is a foreign key?

a)

A unique identifier in a database

b)

A primary key of one table that appears in another table

c)

A field that should not be in a table and needs removing

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