wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

GCSE Computer Science Revision - Data Representation Quiz

Total questions: 53

Worksheet time: 39mins

Name
Class
Date
1.

What is the binary representation of the decimal number 13?

a)

1101

b)

1011

c)

1110

d)

1001

2.

How many bits are in a hexadecimal digit?

a)

2

b)

4

c)

8

d)

16

3.

Which of the following is NOT a method of data compression?

a)

Lossless Compression

b)

Lossy Compression

c)

Encryption Compression

d)

Run-Length Encoding

4.

What is the primary purpose of data encryption?

a)

To compress data to save storage space

b)

To convert data into a secret code for security

c)

To convert data into binary form for transmission

d)

To increase the speed of data transmission

5.

What is the hexadecimal notation for the binary number 1010 1101?

a)

9D

b)

AD

c)

BD

d)

AE

6.

In the context of data transmission, what does the term "bandwidth" refer to?

a)

The amount of data that can be stored on a device

b)

The maximum transmission capacity of a device

c)

The security protocol used during data transmission

d)

The compression ratio achieved during data transmission

7.

Which of the following is an example of lossy compression?

a)

ZIP

b)

JPEG

c)

PNG

d)

FLAC

8.

Which of the following best describes the process of converting plaintext into ciphertext?

a)

Data Compression

b)

Data Encryption

c)

Data Transmission

d)

Data Representation

9.

How is sound represented in digital form?

a)

By converting analog sound waves into binary numbers

b)

By converting analog sound waves into shapes

c)

By converting analog sound waves into colors

d)

By converting analog sound waves into letters

10.

What is the unit used to measure the frequency of sound waves?

a)

Miles per hour (mph)

b)

Kilograms (kg)

c)

Degrees Celsius (°C)

d)

Hertz (Hz)

11.

What is the sampling rate for CD-quality audio?

a)

44.1 kHz

b)

55 kHz

c)

22 kHz

d)

10 kHz

12.

What is the bit depth of CD-quality audio?

a)

24 bits

b)

32 bits

c)

16 bits

d)

8 bits

13.

What is the difference between analog and digital sound representation?

a)

Analog sound representation uses digital signals while digital sound representation uses analog signals.

b)

Analog sound representation is louder than digital sound representation.

c)

Analog sound representation has better quality than digital sound representation.

d)

Analog sound representation uses continuous signals while digital sound representation uses discrete signals.

14.

What are the advantages of digital sound representation over analog?

a)

Better quality, easier manipulation, and easy storage and transmission

b)

More expensive, limited options, and inconvenient to use

c)

No difference in quality, harder manipulation, and difficult storage and transmission

d)

Worse quality, difficult manipulation, and hard storage and transmission

15.

What are the common file formats used for digital sound representation?

a)

WAV, MP3, AAC, and FLAC

b)

JPG, PNG, GIF

c)

TXT, PDF, DOC

d)

MOV, AVI, MP4

16.

How does compression affect the quality of digital sound representation?

a)

It only affects the volume of digital sound representation.

b)

It improves the quality of digital sound representation.

c)

It has no effect on the quality of digital sound representation.

d)

It reduces the quality of digital sound representation.

17.

What are the challenges in accurately representing sound in digital form?

a)

Sampling rate, quantization, and compression

b)

Latitude, longitude, and altitude

c)

Wind speed, humidity, and air pressure

d)

Color temperature, brightness, and contrast

18.
Choose the best answer about character sets:
a)
All characters in character sets are stored in binary.
b)
Some characters in character sets are stored in binary.
c)
Only binary characters in character sets are stored in binary.
19.
The following is true about character sets:
a)
Each letter has a unique code
b)
Lower and upper case letters share the same codes
c)
ASCII is one of the latest character sets to be adopted
20.
Identify a true statement:
a)
Standard ASCII only uses the first 128 positions in the table.
b)
Standard ASCII only uses the first 255 positions in the table.
c)
ASCII has more letters than Unicode
21.
The main purpose of character sets is:
a)
To allow humans to express alphanumeric characters in a binary table
b)
To run the Internet
c)
To simplify computer programming
22.
Uppercase characters in ASCII:
a)
Appear before lowercase characters.
b)
Appear after lowercase characters.
c)
Don't get unique codes to store their position in binary.
23.
Unicode can represent:
a)
65,536 different characters
b)
255 characters
c)
127 characters
24.
ASCII uses one byte per character. Unicode uses how many bytes per character?
a)
2 bytes per character.
b)
3 bytes per character.
c)
4 bytes per character.
25.
Quality of an image depends on:
a)
Resolution
b)
Metadata
c)
Screen size
d)
Computer's speed
26.
Resolution is measured in:
a)
Pixels per mm or per inch
b)
Print size.
c)
Milimeters.
d)
Bytes.
27.
Identify a true statement:
a)
Image files can be compressed by setting pixels with similar colour to the exactly same colour.
b)
Compressing files improves their quality.
c)
Resolution doesn't affect the printed size of an image.
d)
Black and white images have colour depth of two bits.
28.
Most graphic formats create many colours from:
a)
Red, green, blue.
b)
Red, pink, yellow.
c)
Red, white, blue.
d)
Black, white, green.
29.
Alpha-channel present in some images refers to:
a)
Transparency of pixels.
b)
Quality of a file.
c)
The order in which alternative pixels are loaded.
d)
Degree of file compression applied to an image file.
30.
A bitmap file is an example of raster graphics.
a)
True
b)
False
31.
A bitmap file contains virtually unlimited number of colours.
a)
False
b)
True
32.
11010101 + 00000001 =
a)
11010110
b)
11010102
c)
10110101
d)
215
33.
00010111 + 01001100 =
a)
1100011
b)
11100011
c)
1110001
d)
1111011
34.
01010101 + 10101010 =
a)
11111111
b)
11111110
c)
11110000
d)
10101011
35.

What effect does a right shift have on a binary number?

(a)  

36.

What effect does a left shift have on a binary number?

(a)  

37.

Perform a left shift of 1 on 00000001

(a)  

38.

Perform a left shift of 2 on 00001111

(a)  

39.

Perform a left shift of 3 on 00011011

(a)  

40.

Perform a right shift of 1 on 00001111

(a)  

41.

A left shift of 1 multiples a number by

(a)  

42.

Right shifts can lead to...

(a)  

43.
Images can contain a geographical location of where the picture was taken. This is stored in a special area of an image file called:
a)
Metadata
b)
File name.
c)
Compression area.
d)
Alpha-channel.
44.
The following is true about metadata:
a)
It is data about data.
b)
It is corrupted data.
c)
It significantly increases file sizes.
45.
Image metada can present privacy risk.
a)
True
b)
False
46.
Metadata can be used to organise and search for images.
a)
True
b)
False
47.

A measure of how detailed a Bitmap image is given by

a)

The colour depth

b)

the Pixel size

c)

the Bits per Dot

d)

the Dots per Inch

48.

When resizing Vector images

a)

They lose definition

b)

The image becomes compressed

c)

There is no loss of quality

d)

Colour depth is lost

49.

An image has a colour depth of 4 bits per pixel, what is the maximum number of colours that can be displayed?

a)

256

b)

18

c)

4

d)

16

50.

Resolution is the number of pixels in an image, what is the resolution of this image?

a)

8 pixels

b)

32 pixels

c)

64 pixels

d)

2 pixels

51.
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
52.

The first line of this image in RLE would be...

a)

8W, 1Bl, 20B, 1W

b)

10B, 4Y, 17R, 2G

c)

2G, 10P, 17Y, 2Bl

53.
Replaces repeating pixels or codes
a)
Run Length Encoding
b)
Dictionary Encoding

Similar Resources on Wayground

#5 CIW Data Analyst - Certification Prep

54 questions

#5 CIW Data Analyst - Certification Prep

quiz

Worksheet

•

9th Grade - University

ICT in society

50 questions

ICT in society

quiz

Worksheet

•

5th Grade - University

virtual memory

50 questions

virtual memory

quiz

Worksheet

•

11th - 12th Grade

Foundations of Computer Science Exam Review

50 questions

Foundations of Computer Science Exam Review

quiz

Worksheet

•

9th - 12th Grade

Year7 End of Unit Assessment - Autumn 1

50 questions

Year7 End of Unit Assessment - Autumn 1

quiz

Worksheet

•

6th Grade - University

Career Trivia Quiz

49 questions

Career Trivia Quiz

quiz

Worksheet

•

8th - 12th Grade

Advanced HTML5 & CSS3 Part IV

55 questions

Advanced HTML5 & CSS3 Part IV

quiz

Worksheet

•

9th - 12th Grade

EOPA Overall Review #2 Random

50 questions

EOPA Overall Review #2 Random

quiz

Worksheet

•

9th - 12th Grade