N5 Computer Systems

How is the denary number 102 expressed as an 8-bit binary number?

The binary number 10001101 is what when expressed as a denary number?

• 141

• 140

• 153

• 152

Fill in the blanks:

​ (a)   representation is used when ​ (b)   numbers need to be represented using ​ (c)  

• Floating point
• real
• binary
• Scientific notation
• integer
• decimal

In the below number, expressed in floating point representation, the ​ (a)   is ​ (b)   and the ​ (c)   is ​ (d)  

.110101 x 2^101

• mantissa
• 110101
• 101
• exponent
• 5
• .110101
• 2

When using ​ (a)   to represent text in a computer, every ​ (b)   is given a different ​ (c)   ​ (d)   made up of ones and zeros. 

(all 4 answers are correct, you need to get them in the correct place)

• ascii
• character
• 8-bit
• binary code

Why is ascii used to translate text characters into binary?

(more than one answer)

• So that different types of computer can communicate

• So that different types of computer can transfer information to each other

• So that different types of computer can access the web

• So that different types of computer can connect to different types of network

Extended ASCII represents both control characters and printable characters.

Control characters are used to perform actions rather than print a character on screen. For example, ​ (a)   , ​ ​ (b)   and ​ (c)  

• delete
• escape
• backspace
• letters
• numbers
• punctuation

Extended ASCII represents both control characters and printable characters.

Printable characters are used to display a character on screen. For example, ​ ​ (a)   , ​ ​ ​ (b)   and ​ ​ (c)  

• letters
• numbers
• punctuation
• delete
• escape
• backspace

Bit-mapped graphics– are known as a ​ (a)   array of ​ (b)   . The total number of pixels in an image is referred to as the ​ (c)   . The higher the resolution the ​ (d)   the ​ (e)   of the image.

• 2D
• pixels
• resolution
• quality
• 3D
• dots
• better
• lower

The number of bits (0 or 1) allocated to each pixel is called ​ (a)   or ​ (b)   . Using more bits per pixel means having a ​ (c)   number of colours available, but the ​ (d)   will increase.

• bit depth
• colour depth
• higher
• file size
• lower
• picture size