Computer Science Pack

Question 1

What is meant by a Denary System?

Answer 1

Number system based on the number 10

Question 2

What is meant by a Binary System?

Answer 2

Number system based on the number 2

Question 3

What are the placeholder values for binary?

Answer 3

128, 64, 32, 16, 8, 4, 2, 1

Question 4

What is the process for converting binary to denary?

Answer 4

Add up the placeholder values where a 1 appears underneath it

Question 5

What is the process for converting denary to binary?

Answer 5

Place a 1 if the value you have is smaller than the placeholder value. Then subtract your value by the placeholder value.

IF your number is smaller than the placeholder value, just put a 0 in.

Question 6

How many bits in a nibble?

Answer 6

4

Question 7

How many bits in a byte? 1

Answer 7

8

Question 8

List all the memory sizes from largest to smallest 2

Answer 8

PB
TB
GB
MB
KB
B

Question 9

What number do you multiply/divide by to convert measurement units?

Answer 9

1024

Question 10

What is a computer system?

Answer 10

A computer system is made up of software, data, hardware, communications and people/users

Question 11

What is a subsystem?

Answer 11

A sub-system is a system that can be divided up into smaller parts.

Each sub-system can be further divided into sub-systems and so on until each sub-system just performs a single action.

Question 12

Year 10:

What base system does Hexadecimal use?

Answer 12

Base 16

Question 13

Year 10:

Why do you use Hexadecimal?

Answer 13

It is easier to remember than Binary for a programmer.

Question 14

Year 10:

Give an example of where you use Hexadecimal numbers.

Answer 14

To represent colour codes for websites

Question 15

What is an algorithm?

Answer 15

It is a sequence of steps that follow a logical order to solve a problem

Question 16

What is data transmission?

Answer 16

is data being passed over a short distance or a long distance.

Question 17

Give an example of data transmission over a short distance

Answer 17

Computer to printer

Question 18

Give an example of data transmission over a long distance

Answer 18

Over a telephone network

Question 19

How many factors need to be considered when transmitting data?

Answer 19

3

Question 20

State how computers avoid errors during transmission

Answer 20

Each factor has to be agreed by both the sender and receiver to work

Question 21

State the 3 factors that need to be considered when transmitting data

Answer 21

1. The direction of the data transmission
2. The method of transmission
3. The method of synchronisation between devices