WorksheetsS1 Computer Systems
Total questions: 20
Worksheet time: 21mins
The binary number 1101 represents the decimal number (a)
The decimal number 9 is represented by (a) in binary.
The largest number that can be represented by 4 bits is:
12
13
15
31
The smallest number that can be represented by 4 bits is:
1
0
2
3
Text must be stored in a binary code in computers. this code is called:
Code for text
ASCII
Alphabet code
ACISS
A bit (a) graphic is one way of storing an image on a computer.
Bitmap images are stored as a series of tiny dots called
Pixies
Pixels
Pixars
Pictures
How many bits would it take to represent this black and white image?
10
20
25
36
In a colour bit mapped graphic, if you use 4 bits for each pixel how many colours can you represent?
32
8
16
4
What is an input device?
An input device is a device that converts the results from the processor into data we can see or hear.
An input device is a device that allows the user to save data to and to load data from.
An input device is part of the processor of a computer.
An input device is a device that allows the user to give the computer data.
What is an output device?
An output device is a device that converts the results from the processor into data we can see or hear.
An output device is a device that allows the user to save data to and to load data from.
An output device is part of the processor of a computer.
An output device is a device that allows the user to give the computer data.
What is a backing storage device?
A backing storage device is a device that converts the results from the processor into data we can see or hear.
A backing storage device is a device that allows the user to save data to and to load data from.
A backing storage device is part of the processor of a computer.
A backing storage device is a device that allows the user to give the computer data.
Tick the input devices
Webcam
Microphone
Screen
Keyboard
Mouse
Tick the output devices
Mouse
Speakers
Screen
Printer
Trackpad
Tick the backing storage devices
Hard drive
USB Memory stick
Webcam
SD Card
Microphone
Which of the following devices is an input and an output device?
Keyboard
Touch sensitive screen
Mouse
Printer
Which backing storage device does a Raspberry Pi use?
USB Memory stick
Cloud storage
Hard drive
SD Memory Card
Which sentence below best defines encryption?
Encryption is the process of converting information or data into a code to prevent unauthorised access.
Encryption is the process of converting information or data into a code to prevent authorised access.
Encryption is the process of putting a password on a file to protect it.
Encryption is the process of slowing down data transfer.
What is the Caesar's Cipher?
A way of password protecting a file
A simple encryption method that involves replacing each letter in a message with one ahead or behind in the alphabet
A complex encryption method using two keys
A complex encryption method using four keys
What is the encrypted text for "computer" when a Caesar cipher with a key value of A=d is used?
eqorwvgt
frpsxwhu
iusvazkx
frpsswhu
