Lavington ICT
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Quiz for the A451 topic data representation

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Lavington ICT
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2.1.4 Data Representation

Question 1 of 19

1

Modern computers work in binary because it is easy to represent two states in simple electronic circuits. Binary is
a...

Select one of the following:

  • a base 2 numbering system with 2 symbols.

  • a base 6 numbering system with 6 symbols.

  • a base 10 numbering system with 10 symbols.

  • a base 4 numbering system with 4 symbols.

Explanation

Question 2 of 19

1

Each digit in binary is called a...

Select one of the following:

  • byte

  • nibble

  • bit

  • kilobyte

Explanation

Question 3 of 19

1

A group of 8 binary bits is called a...

Select one of the following:

  • byte

  • bit

  • nibble

Explanation

Question 4 of 19

1

A group of 4 binary bits is called a...

Select one of the following:

  • bit

  • byte

  • nibble

Explanation

Question 5 of 19

1

How many kilobytes are in a megabyte?

Select one of the following:

  • 1000

  • 1028

  • 1024

  • 1026

Explanation

Question 6 of 19

1

How many megabytes are in a gigabyte?

Select one of the following:

  • 1024

  • 1028

  • 1026

  • 1000

Explanation

Question 7 of 19

1

If a computer has only 8 bits to store a value then the last bit of a 9 bit number will be lost. This is called...

Select one of the following:

  • an over error.

  • an overflo error.

  • an overflow error.

  • an underflow error.

Explanation

Question 8 of 19

1

Hexadecimal numbers are...

Select one of the following:

  • base 12

  • base 6

  • base 16

  • base 10

  • base 18

Explanation

Question 9 of 19

1

All symbols displayed in a computer are represented by a code. The computer looks up the symbol matching the code from a list of codes and their associated characters. The list of codes and characters is called the...

Select one of the following:

  • character set.

  • character collection.

  • character group.

  • character assemble.

Explanation

Question 10 of 19

1

ASCII uses...

Select one of the following:

  • 7 bits so can provide 127 characters or symbols plus the null character (128 in total).

  • 7 bits so can provide 127 characters or symbols.

  • 7 bits so can provide 127 characters plus the null character (128 in total).

Explanation

Question 11 of 19

1

Unicode uses 16 bits...

Select one of the following:

  • providing over 65,000 possibilities or 32 bits providing over 2 billion possibilities.

  • providing over 65,000 possibilities or 32 bits providing over 1 billion possibilities.

  • providing over 65,000 possibilities or 32 bits providing over 3 billion possibilities.

  • providing over 65,000 possibilities or 32 bits providing over 4 billion possibilities.

Explanation

Question 12 of 19

1

A pixel is one dot in an image. The number of bits per pixel determines...

Select one of the following:

  • how many colours each dot can represent.

  • how many dots each dot can represent.

  • how many shades each dot can represent.

  • how many pixels each dot can represent.

Explanation

Question 13 of 19

1

The more bits per pixel the greater the...

Select one of the following:

  • pixel depth.

  • colour depth.

  • dot depth.

Explanation

Question 14 of 19

1

The resolution of an image is the...

Select one of the following:

  • number of dots per unit, e.g.the number of dots per inch (usually called dots per inch or 'dpi').

  • number of pixels per unit, e.g.the number of pixels per inch (usually called dots per inch or 'dpi').

  • number of pixels per unit, e.g.the number of dots per inch (usually called dots per inch or 'dpi').

Explanation

Question 15 of 19

1

The sample rate of a sound is the...

Select one of the following:

  • number of times per minute that the sound wave is measured. The higher the sample rate the more accurately the wave is represented.

  • number of times per second that the sound wave is measured. The lower the sample rate the more accurately the wave is represented.

  • number of times per second that the sound wave is measured. The high the sample rate the more accurately the wave is represented.

Explanation

Question 16 of 19

1

The sample interval of a sound is the...

Select one of the following:

  • wave gap between measurements of a sound wave being taken.

  • time gap between measurements of a sound being taken.

  • time gap between measurements of a sound wave being taken.

Explanation

Question 17 of 19

1

The sample resolution of a sound is the...

Select one of the following:

  • number of bits used to store the value of each wave. The higher the number of bits the more accurately the value is
    stored.

  • number of waves used to store the value of each sample. The higher the number of bits the more accurately the
    value is stored.

  • number of bits used to store the value of each sample. The higher the number of bits the more accurately the value
    is stored.

Explanation

Question 18 of 19

1

An instruction set is the group of instructions available for that specific processor to use. The number of instructions available will depend on...

Select one of the following:

  • the number of bits used.

  • the number of instructions used.

  • the speed of the processor.

Explanation

Question 19 of 19

1

The CPU fetches instructions and decodes them in order to find out what to do next. The instructions are in two parts: the OPERATOR and the OPERAND. The OPERATOR or OPCODE represents...

Select one of the following:

  • an operation e.g. 'ADD' or 'SUB' or 'DIV'

  • a maths operator only e.g. 'ADD.'

  • further instructions for the CPU.

Explanation

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