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2.1.4 Data Representation

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Quiz for the A451 topic data representation
Lavington ICT
Quiz by Lavington ICT, updated more than 1 year ago
Lavington ICT
Created by Lavington ICT over 9 years ago
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Resource summary

Question 1

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

Question 2

Question
Each digit in binary is called a...
Answer
  • byte
  • nibble
  • bit
  • kilobyte

Question 3

Question
A group of 8 binary bits is called a...
Answer
  • byte
  • bit
  • nibble

Question 4

Question
A group of 4 binary bits is called a...
Answer
  • bit
  • byte
  • nibble

Question 5

Question
How many kilobytes are in a megabyte?
Answer
  • 1000
  • 1028
  • 1024
  • 1026

Question 6

Question
How many megabytes are in a gigabyte?
Answer
  • 1024
  • 1028
  • 1026
  • 1000

Question 7

Question
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...
Answer
  • an over error.
  • an overflo error.
  • an overflow error.
  • an underflow error.

Question 8

Question
Hexadecimal numbers are...
Answer
  • base 12
  • base 6
  • base 16
  • base 10
  • base 18

Question 9

Question
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...
Answer
  • character set.
  • character collection.
  • character group.
  • character assemble.

Question 10

Question
ASCII uses...
Answer
  • 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).

Question 11

Question
Unicode uses 16 bits...
Answer
  • 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.

Question 12

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

Question 13

Question
The more bits per pixel the greater the...
Answer
  • pixel depth.
  • colour depth.
  • dot depth.

Question 14

Question
The resolution of an image is the...
Answer
  • 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').

Question 15

Question
The sample rate of a sound is the...
Answer
  • 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.

Question 16

Question
The sample interval of a sound is the...
Answer
  • 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.

Question 17

Question
The sample resolution of a sound is the...
Answer
  • 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.

Question 18

Question
An instruction set is the group of instructions available for that specific processor to use. The number of instructions available will depend on...
Answer
  • the number of bits used.
  • the number of instructions used.
  • the speed of the processor.

Question 19

Question
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...
Answer
  • an operation e.g. 'ADD' or 'SUB' or 'DIV'
  • a maths operator only e.g. 'ADD.'
  • further instructions for the CPU.
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