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Worksheets9.4.4 Retrieval
Total questions: 37
Worksheet time: 25mins
Python Retrieval:
In programming, what is iteration?
The repetition of steps within a program
The order in which instructions are carried out
A decision point in a program
Testing a program to make sure it works
Python Retrieval:
Which of the following symbols is used in Python for variable assignment
=
!=
==
>=
If you receive an email with a suspicious link, it is likely what type of attack?
Organising Data Retrieval:
What is the 3 letter acronym used for the language that searches and amends databases?
(clue: S-- )
(a)
Which of the following are the signs of a virus attack?
The computer runs slower than normal.
There is a change in file size.
The computer restarts on its own.
You receive a suspicious email.
What is a pixel?
A picture element - the small dots that make up an image
How an image is stored on the computer.
A type of image
A special type of photograph
The number of pixels in an image is called the
(a)
The smallest unit of data stored in an image file is called:
Pixels
Resolution
Alpha
Bitmap
Increasing the colour depth means…
A bigger range of colours can be used for each pixel
More pixels are in the image
More colours are in the image
Darker colours
How many colours can be used for each pixel if the colour depth is 4 bit?
(a)
Reducing the colour depth of an image will ......
Improve the quality of the image
Reduce the amount of binary needed for each pixel
Make the file size larger
Remove pixels from the image
decreasing the resolution of an image means that:
More pixels will be used to make up the image
More colours will be used to make up the image
The image size will be bigger
Fewer pixels will be used to make up the image
Tiny squares called (a) are the building blocks of all digital images.
Which one of the following answers best describes a limitation of this colour depth?
Only a few colours can be displayed
The system could not be used for simple computer games
Only 1 colour can be displayed
Only 2 colours can be displayed
How many colours is the bottom picture showing given that it is using 4 bit colour depth?
16 colours
4 colours
256 colours
5 colours
When we have a 'two-bit' colour depth, how many possible colours can you have?
0
1
2
4
8
What is the colour depth of the image?
colour depth of 1
colour depth of 2
colour depth of 4
colour depth of 16
What does 'dpi' mean?
The number of colours supported by the image format
The number of dots that can be plotted each second on a screen or printer
The number of dots used per horizontal inch in the image
What does DPI stand for?
(a)
This bitmap image uses a colour depth of 8 bits. What are the maximum number of colours that can be used?
(a)
In the RGB colour system the Primary colours are? (tick which apply)
RED
GREEN
BLUE
MAGENTA
WHITE
There are these many colours in RGB
1,000,000
16,777,216
150,000
12
(RGB) 255 0 0 makes the colour ?
RED
GREEN
BLUE
WHITE
BLACK
RGB 255 255 255 makes the colour ?
RED
GREEN
BLUE
WHITE
BLACK
output devices use light to display color.
True
False
What would be the size of an image file that is 10x10 pixels in size and has a 2 bit colour depth?
(a)
Each bit of binary can either be represented by a 1 or a _
(a)
The numbers 1 and 0 are used in the (a) number system
(a) R (b) G (c) B = White
