WorksheetsAQA GCSE Computer Science - 3.3.6 Representing images
Total questions: 20
Worksheet time: 7mins
Name
Class
Date
1.
Which of these is not an image file extension?
a)
MP3
b)
GIF
c)
TIF
d)
BMP
2.
How does an increase in the number of colours affect the file size relative to the overall file size?
a)
Larger increase
b)
Stays the same
c)
Small decrease
d)
Big decrease
3.
Images can be represented using 1s and 0s?
a)
true
b)
Sometime
c)
Half the time
d)
Never
4.
Each pixel in an image has 16 colours. What is the colour depth?
a)
4 bits
b)
2 bits
c)
3 bits
d)
5 bits
5.
How many total colours can be used in an image with a colour depth of 6 bits?
a)
64
b)
32
c)
16
d)
128
6.
An image has a height of 200 pixels, width of 400 pixels and a colour depth of 3 bits. What is the file size in bytes?
a)
30000
b)
240000
c)
120000
d)
48000
7.
The file size of an image is 90kiloB. The height and width are 300 and 400 pixels. What is the colour depth used in the image?
a)
6bits
b)
7bits
c)
8bits
d)
5bits
8.
Calculate the size in kilobytes of an image captured in 16 colours with a size of 1,000 pixels by 1,000 pixels?
a)
500
b)
250
c)
1000
d)
50
9.
Another term for Bitmap graphic is?
a)
Rastor Graphic
b)
Vector Graphic
c)
3D Graphic
d)
Text
10.
How many colour channels are there in a 24bit image?
a)
3
b)
2
c)
4
d)
1
11.
How many shades of grey does grey scale have?
a)
256
b)
16
c)
65536
d)
8
12.
How many bits are required for 16.7 million colours?
a)
24
b)
16
c)
32
d)
3
13.
Calculate the size of a black and white image that is 96 pixels wide and 1,024 pixels high in bytes.
a)
12288
b)
24576
c)
20576
d)
25576
14.
What does 'dpi' mean?
a)
The number of dots that can be fit into a inch horizonatlly
b)
The number of dots that can be plotted each second on a screen or printer
c)
It is a measure of how much an image has been compressed
d)
The number of colours supported by the image format
15.
Which compressed file format is often used for storing digital camera images?
a)
JPG
b)
BMP
c)
PNG
d)
MP3
16.
Which of these is not compressed
a)
SVG
b)
PNG
c)
JPEG
d)
TIFF
17.
What is a pixel?
a)
It is a single colour 'dot' in a bitmap image
b)
It is an animated object in a game that can move or collide with other objects
c)
It is a pair of coordinates that tell the computer where to draw a point on the screen
d)
It is a type of colour e.g. red
18.
Why do bitmap images often appear blocky if you enlarge them too much?
a)
Because there are only a limited number of pixels in the bitmap image
b)
Because of rounding errors in the calculations for the coordinates and formulae being used to draw the image
c)
Because adding new pixels to the image would take up all of the computer's memory as you zoom in
d)
There aren't enough colours to choose from
19.
How many bytes would a 16 colour icon with dimensions of 100 x 100 pixels take to store?
a)
5000 bytes
b)
4500 bytes
c)
6000 bytes
d)
5500 bytes
20.
How many bits per pixel would be required for an image with 256 colours?
a)
8
b)
4
c)
16
d)
2
100 %
