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Yr 8 End of Unit 1

Total questions: 21

Worksheet time: 13mins

Name
Class
Date
1.

What is binary

a)

A sequence of 1's and 0's

b)

The way a computer speaks

c)

A useless code that is no longer used

2.

What kind of 'base' system is binary known as?

a)

Base 10

b)

Base 2

c)

Base 16

3.

What kind of number system is used in everyday life?

a)

Denary

b)

Binary

c)

A simple number system

4.
Convert 128 to binary
a)
10000000
b)
01111110
c)
10000001
d)
11001100
5.
If a binary number ends with a 1, it must be...
a)
An odd number
b)
An even number
c)
A prime number
d)
The number 12
6.
Computers can only understand 0s and 1s.
a)
True
b)
False
7.
How would you write the number two in binary?
a)

00001001

b)

00000001

c)

00000000

d)

00000010

8.
Binary is made up of which numbers 
a)
3 and 4.
b)
2 and 3.
c)
1 and 2.
d)
0 and 1.
9.
8 bytes = 1 bit
a)
TRUE
b)
FALSE
10.
Convert this to a decimal number
a)
13
b)
12
c)
10
d)
8
11.

Which algorithm goes through every item in a list of data until it finds the value it is looking for?

a)

Binary Search

b)

Linear Search

12.

What is the golden rule of a Binary Search algorithm?

a)

It can only be used in Computer Science.

b)

It can only be used for numbers.

c)

It can only be used for names.

d)

It will only work correctly if the data is in order.

13.
Select the best description to explain what a linear search algorithm is.
a)
Put the elements in order, check each item in turn.
b)
Put the elements in order, compare with the middle value, split the list in order and repeat.
c)
Elements do not need to be in order, check each item in turn.
d)
Elements do not need to be in order, compare to the middle value, split the list in order and repeat
14.
A linear search is to be performed on the list:
12   6   8  1  3
How many comparisons would it take to find number 1?
a)
1
b)
2
c)
3
d)
4
15.
A binary search is to be performed on the list:
1  5  10  13  48  68  100  101
How many comparisons would it take to find number 101?
a)

1

b)

2

c)

3

d)

4

16.
Describe an advantage of a linear search algorithm
a)
Data does not need to be in order.
b)
Performs well over large ordered lists.
c)
Can only work on an ordered list.  If unordered must use a linear search.
d)
Slow with large data sets.
17.
Describe an advantage of a binary search algorithm
a)
Data does not need to be in order.
b)
Performs well over large ordered lists.
c)
Can only work on an ordered list.  If unordered must use a linear search.
d)
Slow with large data sets.
18.
Describe a disadvantage of a linear search algorithm
a)
If the criteria matches the last item in list, entire list has to be checked.
b)
Simple to code than a binary search.
c)
Quicker than a linear search.
d)
Can only work on an ordered list.  If unordered must use a linear search.
19.
Describe a disadvantage of a binary search algorithm
a)
Data does not need to be in order.
b)
Performs well over large ordered lists.
c)
Can only work on an ordered list.  If unordered must use a linear search.
d)
Slow with large data sets.
20.

What tool is this and what is it's function?

a)

Spot Healing Tool: Removes marks and blemishes

b)

Bandaid Tool: Heals mistakes

c)

Eyedropper: Selects colors from images

d)

Brush tool: Paints custom brush strokes

21.

What do layers allow you to do in photoshop?

a)

Arrange images on a flat image

b)

Make a collage on one layer

c)

Stack images so that you can order them in front or behind each other

d)

Stack images in a neat pile

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