WorksheetsJ277 Data Representation MCQs
Total questions: 50
Worksheet time: 55mins
Name
Class
Date
1.
How many bytes are there per ASCII character in a text file? (1-3)
a)
0.5
b)
1
c)
1.5
d)
2
2.
Which is the smallest of these data capacities? (4-6)
a)
2KB
b)
2049 bytes
c)
0.5MB
d)
3GB
3.
Which is the largest of these data capacities? (4-6)
a)
2048 MB
b)
2 GB
c)
2050 MB
d)
100000 KB
4.
Which formulae can be used to estimate the file size of an image? (7-9)
a)
number of pixels * number of bytes per pixel
b)
number of pixels
c)
number of pixels wide * number of pixels high * number of bytes per pixel
d)
number of pixels wide * number of bytes per pixel * number of pixels
5.
Which formulae can be used to estimate the file size of a sound file? (7-9)
a)
bytes per sample * channels * height + number of minutes
b)
samples per second * number of seconds
c)
samples per second * bytes per sample * duration
d)
samples per second * bit depth * duration
6.
What numeric base does binary operate on? (1-3)
a)
2
b)
1
c)
8
d)
16
7.
How many bits are there in a byte? (1-3)
a)
8
b)
16
c)
1
d)
2
8.
What is the minimum number of bits needed to represent 15 in denary? (4-6)
a)
6
b)
4
9.
What is the 8 bit binary representation of 17? (4-6)
a)
00010010
b)
00010001
c)
00001101
d)
00100010
10.
What is the 8 bit binary representation of 32? (4-6)
a)
00100000
b)
00100100
c)
00110000
d)
00100001
11.
What is the denary representation of this 8 bit number? 01001111 (4-6)
a)
59
b)
79
c)
69
d)
49
12.
What is the denary representation of this 8 bit number? 11010101 (4-6)
a)
199
b)
206
c)
228
d)
213
13.
How Bytes are there in a Terabyte? (4-6)
a)
1024 Kilobytes
b)
1024 Megabytes
c)
1024 Gigabytes
14.
Why do we use the binary number system in Computing? (4-6)
a)
Because a CPU has two transistors
b)
To represent the two different states of transistors
c)
To allow the CPU to be in one of two states
15.
What is the hex number 6B in binary? (4-6)
a)
01101011
b)
10101110
c)
01110111
16.
How many bits are used to represent a character in ASCII? (1-3)
a)
16
b)
1
c)
4
d)
8
17.
How many Bytes per character are used in Unicode? (1-3)
a)
8
b)
16
c)
1
d)
2
18.
ASCII code is represented by using 16 bits per character. (1-4)
a)
True
b)
False
19.
The ASCII character set is capable of representing non-Western languages. (1-3)
a)
True
b)
False
20.
Upper and lower case letters (e.g. A and a) have a different ASCII code. (3-4)
a)
True
b)
False
21.
What is the maximum number of characters that can be represented using 8-bits?
a)
255
b)
256
c)
65536
d)
127
22.
What is the maximum number of characters that can be represented using 7-bits?
a)
255
b)
256
c)
127
d)
128
23.
ASCII can represent more characters than Unicode. (1-3)
a)
True
b)
False
24.
ASCII Stands for (4-6)
a)
American Standard Code for Information Interchange
b)
American Scientific Code for Information Interchanging
c)
Absolute Standard Codes for Instruction Interchange
25.
What do we call the smallest unit of data that can be represented in an image? (1-3)
a)
Pixel
b)
Dot
c)
Colour
d)
Bit
26.
What is meant by colour depth? (1-3)
a)
Number of pixels in the image
b)
The number of colours available for each pixel
c)
How pixelated the image is
27.
If you increase the colour depth the file size will decrease. (4-6)
a)
True
b)
False
28.
How many colours can be represented with a 4 bit colour depth? (7-9)
a)
2
b)
4
c)
16
d)
256
29.
What is often stored with an image? (4-6)
a)
Microdata
b)
Metadata
c)
Megadata
30.
In modern technology what unit of measurement is used for screen resolution?
a)
Colours per inch (CPI)
b)
Dots per inch (DPI)
c)
Pixels per meter (PPM)
31.
Which of the following is not stored as metadata about an image? (6-9)
a)
Height
b)
Colour depth
c)
Resolution
d)
Number of people in the image
32.
Which of the following is not an image file? (4-6)
a)
PNG
b)
JPEG
c)
Bitmap
d)
MPEG
33.
What three colours are used to produce a broad array of colours in a computer system? (1-3)
a)
Green, Red, Orange
b)
Red, Green, Blue
c)
Yellow, Green, Red
34.
What unit is sample rate measured in? (1-4)
a)
Bits per second (bps)
b)
Hertz (Hz)
c)
Megabits per second (Mbps)
35.
Which of the following is not true if you increase the sample rate? (4-6)
a)
Better quality of recording
b)
Needs greater storage space
c)
The compression rate increases
d)
Decrease in quality
36.
What is meant by the term bit depth? (4-6)
a)
The number of samples taken per second
b)
The amplitude of each sample
c)
The number of bits used per second of audio
d)
The number of bits used to store each sound sample
37.
What is measured when the wave is sampled? (3-6)
a)
Amplitude
b)
Hertz (Hz)
c)
Bit rate
d)
Frequency
38.
What piece of hardware would you use to input sound into a computer? (1-3)
a)
Speaker
b)
Analogue to digital converter
c)
Microphone
d)
Earphones
39.
If you increase the bit depth of an audio file, you increase the quality. (1-3)
a)
True
b)
False
40.
The amplitude of a sound wave is… (6-9)
a)
The height of the wave
b)
The frequency at which it is sampled
c)
The speed at which it travels through air
d)
The sound’s frequency
41.
What is compression? (1-4)
a)
Converts one file to another
b)
Reduces the size of a file to save space
c)
Minimizes the time taken for a file to be downloaded
d)
Increases transmission speeds
42.
What does Lossy Compression do to files? (4-6)
a)
Increases the file size and keeps the same quality
b)
Eliminates no data at all
c)
Decreases the file size and keeps the same quality
d)
Eliminates unnecessary data in a file to reduce file size
43.
What is Lossless Compression? (4-6)
a)
No information is lost but file size is increased
b)
There is no loss in information at all after compression
c)
Files which have the exact same data after compression
d)
An algorithm that stops data being deleted
44.
What type of compression does the ZIP format use? (7-9)
a)
Lossy
b)
Lossless
45.
What type of compression would you use to compress a video and keep the quality? (4-6)
a)
Lossy
b)
Lossless
46.
What type of compression is most appropriate to compress a text file? (4-6)
a)
Lossy
b)
Lossless
47.
What type of compression will remove some of the data?
a)
Lossy
b)
Lossless
48.
Which of the following are not usually in a compressed format? (7-9)
a)
JPEG
b)
MPEG
c)
Bitmap
d)
MP3
49.
Uncompressed audio and video files always require less memory than compressed files. (1-4)
a)
True
b)
False
50.
JPEG stands for… (4-6)
a)
Joint Photo Exempted Grade
b)
Joint Photographic Experts Group
c)
Junior Photographic Export Group
100 %
