WorksheetsOCR 1.2 Data Rep Exam
Total questions: 44
Worksheet time: 45mins
What does BIT stand for? [1]
(a)
How many bits is required to store 23 different colours in a bitmap image? [1]
(a)
Drag each label to the correct reference on the image. [1]
bit
byte
nibble
binary
Order the following file sizes from smallest to largest [2]
Tip: Convert all to one measurement e.g. Kilobytes
2000 Bits
600 Nibbles
2 Megabyte
3000 Kilobytes
0.5 Gigabytes
Order the following file sizes from smallest to largest [1]
Byte
Kilobyte
Megabyte
Gigabyte
Terabyte
Why do computer process data in binary form? [1]
Because it is easier for human beings to understand
Because computers contain circuits with switches which have two states (on and off)
Because computers contain circuits with switches which have 10 states
Because data in decimal form is processed more slowly
Convert the decimal number 47 to 8-bit binary. [1]
Use the paper handed to you for working.
(a)
Convert the binary number 10110101 to decimal. [1]
Use the paper handed to you for working.
(a)
Add the following binary numbers: 10110 + 11011 [1]
Use the paper handed to you for working.
(a)
Perform a 2-bit left shift on the binary number 1110 0110 [1]
Use the paper handed to you for working.
(a)
A 2-bit left shift on 11110000 causes [1]:
(a) the number to (a)
(b) an (b) error if the computer can only store 8-bits
Match the number systems to the correct bases [1]
Binary
Decimal
Denary
Hexadecimal
Fill the blanks [1]:
An overflow error is when the binary number is too (a) to be stored, resulting in a (b) of (c) digits
What is the primary reason for using hexadecimal representation in computing? [1]
It is easier for computers to process
It is more compact and easier for humans to read than binary
It is the native language of computers
It allows for faster data transmission
It is used for encryption
Match the hexadecimal letters to their correct decimal values [1]
B
11
A
10
F
15
E
14
D
13
Convert the hexadecimal number B3 to decimal [1]
Use the paper handed to you for working.
(a)
Convert the decimal number 236 to hexadecimal. [1]
Use the paper handed to you for working.
(a)
Convert the binary number 0110 1111 to hexadecimal. [1]
Use the paper handed to you for working.
(a)
Use this character set to find the binary code for DOG [1]
(a)
Fill the blanks [1]:
Character sets stores (a) of the characters that a computer can represent. Lower case and upper case letters must have (b) binary codes. The first character set used between computers on the internet was known as (c) .
Sort the options into the relevant character set [2]
Can represent lowercase and uppercase letters
Limited to 8-bits per character
Can represent emojis
Often 16-bits per character
A folder contains 3 text files.
Each text file uses the ASCII character set with 1-byte per character, and contains 3000 characters.
Calculate an estimate for the folder's file size in bytes [2]
Use the paper handed to you for working.
(a)
A sound file is 5 seconds long, uses a sample rate of 10,000 Hz and a sample resolution of 8 bits.
Calculate the file size in kilobytes. [2]
Use the paper handed to you for working out.
(a)
What is meant by the term 'colour depth'? [1]
Width and height of an image
A pixel in an image
Quality of the colour
Number of bits used to encode colour for each pixel
Fill in the gaps [2]:
sound is (a) at regular time (b) . The (c) of the sound wave is measured and converted into (d) which is stored (e) .
Fill the blanks [1]:
A bitmap image is made up of (a) . Each pixel has a (b) value that corresponds to a unique (c) .
The encoding for this image with a 2-bit colour-depth has been started. What is the correct encoding for the third row? [1]
(a)
Define metadata. [1]
We covered this definition in class, if you do not remember type something and move in.
(a)
Sort these options into Metadata and Non Metadata [1]
Author of image
Geolocation of image
Device image was taken on
Colour of each pixel
Which two factors below impact the realism of an image? [1]
Number of Samples
Colour Depth
Lossless Compression
Image Resolution
File Size
Fill in the gaps [1]:
a. The number of times the wave has been sampled per second is known as (a)
b. The number of bits used to record each sample is known as the (b)
c. The height of the wave representing volume is known as the (c)
What two things happen if the sample rate of an audio clip file is increased? [1]
File Size Increases
File Size Decreases
Accuracy Increases
Accuracy Decreases
Fill the blanks [2]: Lossy compression removes data (a) to reduce file size. (b) compression finds ways to (c) patterns so there is no loss of data. (d) compression cannot be used on text files due to the permanent loss of data.
Which of these is an advantage of lossless compression over lossy compression? [1]
When decompressed, only an approximation of the original file
Lossless often decompresses data more than lossy
Permanent loss of data
No permanent loss of data, so can be used on text files
Sort these devices by either embedded systems or general purpose computers [1]
Laptop
Desktop
Smart Phone
Thermostat
Dishwasher
Washing Machine
Digital Watch
Fill in the gaps [1]:
The main purpose of the CPU is to perform the (a) . During this, the (b) and the (c) (also known as main memory) work together.
If a CPU has a clock speed of 3GHz, how many FDE cycles per second does it perform? [1]
3 million cycles
3 billion cycles
3 trillion cycles
3 hundred cycles
Fill in the gaps [1]:
a. Register that holds the address of the next instruction to fetch (a)
b. The part of the CPU that carries out arithmetic and logical calculations (b)
Which part of the CPU stores frequently used instructions? [1]
(a)
Why do we need secondary storage? [1]
For additional storage
For short term operations
To store data and programs long-term
For virtual memory
Select the three factors that impact the performance of the CPU [1]
Clock Speed
The GPU
Cache Size
Type of Secondary Storage
Number of Cores
Match the storage devices to the correct secondary storage types [1]
USB Stick
Hard Disk Drive
CD
Drag the options to their relevant category [1]
Volatile
Non-Volatile
Read and Write
Read Only
Fill in the gaps below [1]:
An advantage of SSDs is they have (a) read and write speeds when compared to a HDD. On the other hand, HDDs are often (b) to purchase per GB of data.
