WorksheetsYear 9 Computer Science Revision
Total questions: 45
Worksheet time: 25mins
What is the term for a message that has been encoded using a cipher?
Encryption
Decryption
Key
I don't know
The Caesar Cipher is known as what type of cipher?
Substitution
Shift
I don't know
The Caesar cipher is a _____________
substitution cipher
military-grade encryption
unbreakable code
very difficult to decode
Who made the caesar cipher?
Flarmaan FLexer
Julius Caesar
Bob Marley
Cnad
What type of Encryption is this?
Caeserpen
Crosspen
Pigpen
Dogpen
Select the best description to explain what a binary search algorithm is.
Put the elements in order, check each item in turn.
Put the elements in order, compare with the middle value, split the list in order and repeat.
Elements do not need to be in order, check each item in turn.
Elements do not need to be in order, compare to the middle value, split the list in order and repeat
12 6 8 1 3
How many comparisons would it take to find number 1?
Define the term computational thinking
Using a computer
Developing an algorithm to solve a problem
Making a computer use artificial intelligence
Google is computational thinking
Solving a problem using a computer
What is a type of diagram that shows the sequence of steps in an algorithm?
flow chart
pie chart
bar graph
line graph
In a flowchart an input or output instruction is represented by:
A rectangle
A rhombus
A parallelogram
A circle
In a flowchart a calculation (process) is represented by:
A rectangle
A rhombus
A parallelogram
A circle
An Algorithm asks the user to enter their scores for 5 different tests.
This is an example of which of the algorithm constructs?
Decision (Selection)
Loop (Iteration)
Order (Sequence)
All of the above
What is a "Variable" ?
A value that can be changed and manipulated as an algorithm is running
A value that cannot be changed and manipulated as an algorithm is running
What type of operators are AND OR NOT
Arithmetic
Relational
Booleon
When expressing an algorithm in pseudocode, which parts should be capitalised?
Keywords
All of it
Output
Input
The THREE control structures used to create an algorithm are...
Sequence
Selection
Iteration
Variables
What is the output?
True
False
For OR, when is it FALSE?
false AND false
true AND false
false AND true
true AND true
What type of logic gate is this table showing?
AND
OR
NOT
What will the circuit's output be?
1
0
Which logic gate is this?
AND
OR
NOT
What will this gate's output be?
0
1
What will this gate's output be?
0
1
What are the first 6 powers in binary?
0, 2, 4, 8, 12, 32
1, 2, 4, 8, 16, 31
1, 2, 6, 8, 16, 32
1, 2, 4, 8, 16, 32
What is 23 in binary
10101
10110
10111
11000
What is 111111 in denary?
60
61
62
63
The decimal system is also known as ___
base-two notation
base-ten notation
base-sixteen notation
ASCII
Which of the following is NOT a category of Hardware?
Input Devices
Software
Central Processing Unit
Storage Devices
The physical component of a computer system is called?
Software
Hardware
Data
Computer
Which of the following are examples of Input Deices?
Barcode Scanner
Monitor
Joystick
Speaker
Microphone
The CPU is known as the _____________________ of the computer.
Heart
Processor
Brain
All of the Above
Lossy or lossless? This type of compression does not get rid of any data
Lossy
Lossless
Both
What is the smallest representable part of an image?
Pixel
Bit depth
Sample
Resolution
How is the resolution of an image calculated?
Width in pixels * height in pixels
Colour depth * number of pixels
Number of pixels squared
Sample rate * sample resolution * length in seconds
Sound outside of computers is...
Analogue
Digital
Which file type is used for Sound
.MP3
.PNG
.PSD
.DOCX
How many colours can a bitmap using 2-bit colour depth contain?
2
4
8
16
What are bitmaps made up of?
Pixels
Bit depth
Samples
Resolution
