WorksheetsOCR J277- 1.2 Memory and storage
Total questions: 74
Worksheet time: 37mins
What numeric base does binary operate on? (1-4)
2
1
8
16
How many bits are there in a byte? (1-4)
8
16
1
2
What is the maximum number of bits needed to represent 15 in denary? (3-5)
6
4
What is the 8 bit binary representation of 17? (5-7)
00010010
00010001
00001101
00100010
What is the binary representation of 32? (5-7)
00100000
00100100
00110000
00100001
What is the denary representation of this 8 bit number? 01001111 (5-7)
59
79
69
49
What is the denary representation of this 8 bit number? 11010101 (5-7)
199
206
228
213
How Bytes are there in a Terabyte? (5-7)
1024 Kilobytes
1024 Megabytes
1024 Gigabytes
Why do we use the binary number system in Computing?
Because a CPU has two transistors
To represent the two different states of transistors
To allow the CPU to be in one of two states
What is the hex number 6B in binary?
01101011
10101110
01110111
How many bytes are there per character in a text file?
0.5
1
1.5
2
Which is the smallest of these data capacities?
2 KB
2049 bytes
0.5 MB
3 GB
Which is the largest of these data capacities?
2048 MB
2 GB
2050 MB
100000 KB
Which formulae can be used to estimate the file size of an image?
number of pixels * number of bytes per pixel
number of pixels *
number of pixels wide * number of pixels high * number of bytes per pixel *
number of pixels wide * number of bytes per pixel * number of pixels *
Which formulae can be used to estimate the file size of a sound file?
bytes per sample * channels * height + number of minutes
samples per second * number of seconds *
samples per second * bytes per sample * duration
samples per second * samples per second * channels * duration
How many bytes are needed to store 32769 different colours?
1
2
3
4
What is compression?
Converts one file to another
Reduces the size of data to save space
Minimizes the time taken for a file to be downloaded
Compresses something by pressing it very hard
What does Lossy Compression do to files?
Increases the file size and keeps the same quality
Eliminates no information at all
Decreases the file size and keeps the same quality
Eliminates unnecessary information in a file to reduce file size
What is Lossless Compression?
No information is lost but file size is increased
There is no loss in information at all after compression
Files which have the exact same data after compression
Compression that involves an algorithm
What type of compression does the ZIP format use?
Lossy
Lossless
What type of compression would you use to compress a video?
Lossy
Lossless
What type of compression would you use to compress a text file?
Lossy
Lossless
What type of compression may remove some of the data?
Lossy
Lossless
Which of the following are not usually in a compressed format?
JPEG
MPEG
Bitmap
MP3
Uncompressed audio and video files require less memory than compressed files.
True
False
JPEG stands for…
Joint Photo Exempted Grade
Joint Photographic Experts Group
Junior Photographic Export Group
How many bits are used in ASCII?
16
1
7
8
How many Bytes are used in Unicode?
8
16
1
2
The ASCII code is represented by using 16 bits.
True
False
The ASCII is capable of representing non-European languages.
True
False
Upper and lower case letters have a different ASCII code?
True
False
What is the maximum number of values that can be represented in 8-bits?
16
256
65,536
128
What is the maximum number of values that can be represented in 7-bits?
16
256
65,536
128
A character set is...
What language can be used in a computer system
The fonts that a computer has installed.
The possible characters that can be represented by a computer system.
ASCII can represent more characters than Unicode?
True
False
ASCII Stands for
American Standard Code for Information Interchange
American Scientific Code for Information Interchanging
Absolute Standard Codes for Instruction Interchange
RAM - What happens when the electricity is turned off?
The data from the memory is saved onto virtual memory
The data from the memory is saved onto the hard disk
The data from the memory is not saved
The data from the memory is saved onto ROM
Where does virtual memory live?
RAM
Cache
Hard Disk
ROM
Where does the BIOS live?
RAM
Cache
Hard Disk
ROM
Where are the currently used data and instructions kept?
RAM
Cache
Hard Disk
ROM
A computer is continuously paging to the swap file. Discuss why this might be.
There is not enough RAM
The cache is too slow
The virtual memory is too small
The hard disk is too slow
Which of the following is not a type of storage?
Optical
Magnetic
Solid State
Hard Drive
What type of storage is a DVD ROM?
Optical
Magnetic
Solid State
It is not a storage device
What type of storage is a USB memory stick?
Optical
Magnetic
Solid State
It is not a storage device
What type of storage is a SSD card?
Optical
Magnetic
Solid State
It is not a storage device
What type of storage is a HDD?
Optical
Magnetic
Solid State
It is not a storage device
Which of the following types of storage would likely access its data the fastest?
Optical
Magnetic
Solid State
It is not a storage device
Which of the following types of storage is the most durable?
Optical
Magnetic
Solid State
They are all the same
Which of the following types of storage is the most expensive per MB/GB?
Optical
Magnetic
Solid state
They are all the same
Why is a Hard Disk Drive (HDD) not very portable?
It has moving parts
It is too large
It will break if you touch it
It is too small
Why does a laptop need secondary storage?
To backup files to move to another computer
To store data, files and software for future use
To storage programs that are currently running
To store data that the processor needs
Which type of storage uses lasers to write the data?
Optical
Magnetic
Solid state
All types
The R/W speed of storage are listed below from fastest to slowest. Which order is correct?
Solid State, Optical, Magnetic
Optical, Magnetic, Solid State
Magnetic, Optical, Solid State
Solid State, Magnetic, Optical
The types of storage are listed below from least expensive per GB to the most expensive per GB. Which order is correct?
Solid State, Optical, Magnetic
Optical, Magnetic, Solid State
Magnetic, Optical, Solid State
Solid State, Magnetic, Optical
The types of storage are listed below from the most reliable to the least reliable. Which order is correct?
Solid State, Optical, Magnetic
Optical, Magnetic, Solid State
Magnetic, Optical, Solid State
Solid State, Magnetic, Optical
What do we call the smallest unit of data that can be represented in an image?
Pixel
Dot
Colour
Bit
What is meant by colour depth?
Number of pixels in the image
The number of colours available for each pixel
How pixelated the image is
If you increase the colour depth the file size will decrease.
True
False
How many colours can be represented with a 4 bit colour depth?
2
4
16
256
What is the term used to define what must be known about a bitmap, for it to be represented accurately?
Microdata
Metadata
Megadata
In modern technology what unit of measurement would be used for screen resolution?
Pixels per inch (PPI)
Dots per inch (DPI)
Pixels per meter (PPM)
Which of the following is not stored as metadata about an image?
Height
Colour depth
Resolution
Number of people in the image
Which of the following is not an image file?
PNG
JPEG
Bitmap
MPEG
What three colours are used to produce a broad array of colours in a computer system?
Green, Red, Orange
Red, Green, Blue
Yellow, Green, Red
What is the name of the type of graphic that uses shapes of solid colour?
Raster
GIF
JPEG
Vector
What unit is sample rate measured in?
Bits per second (bps)
Hertz (Hz)
Megabits per second (Mbps)
Which of the following is not true if you increase the sample rate?
Better quality of recording
Needs greater storage space
Larger file size
Decrease in quality
What is meant by bit depth?
The number of samples taken per second
The amplitude of each sample
The number of bits used per second of audio
The number of bits used to store each sound sample
What is measured when the wave is sampled?
Amplitude
Hertz
Bit rate
Frequency
What sample rate is used for CD quality sound?
44,100 Hz
88,200 Hz
22,100 Hz
The purpose of a Digital to Analogue converter is to...
Convert binary data into analogue form so we can hear it via a speaker
Convert sound waves into binary so it can be understood by a computer
What piece of hardware would you use to input sound into a computer?
Speaker
Analogue to digital converter
Microphone
Digital to analogue converter
If you increase the bit depth of an audio file, you increase the quality.
True
False
The amplitude of a sound wave is...
How high the wave is from the crest or trough
The frequency at which it is sampled
The speed at which it travels through air
