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3 questions · 5 marks
Binary, denary and hexadecimal patterns represent numbers.
Convert the binary pattern 1110 1100 to denary.
Award one mark for:
236
Why: Correct: 128 + 64 + 32 + 8 + 4 = 236 (1).
55
Why: Reads the place values from the wrong end (the left-hand bit as 1), so the value is wrong.
5
Why: Counts the 1s instead of adding their place values.
A computer uses a character set to represent text.
Define the term character set.
Award one mark for any of the following up to a maximum of two marks:
Allow 'a list of characters that a computer can represent' for the first mark.
Do not accept a program/software that converts text into binary.
Do not accept 'a set of binary codes' on its own.
A set of characters, such as letters, digits and punctuation, where each character is represented by a unique binary code.
Why: Set/collection of characters with examples (1) and each character has a unique code (1).
A set of letters and symbols that a computer can use to represent text.
Why: Awarded for the set/collection of characters (1); no creditworthy point saying each character has its own unique code (0).
A program that converts the keys pressed on a keyboard into binary.
Why: Describes software that converts text, not a set of characters; the Do not accept line applies.
Data storage is measured in binary multiples.
Define the term bit.
Award one mark for any of the following up to a maximum of two marks:
Allow binary digit/binary place value for binary digit
Allow a single binary digit for a single 0 or 1
Do not accept a group of 8 bits/half a nibble of 4 bits, which describe a byte or a nibble
Do not accept a binary number/binary on its own
A binary digit that can have the value 0 or 1.
Why: A binary digit (1) and has the value 0 or 1 (1).
It is the smallest unit of data storage.
Why: Smallest unit of data storage (1), but does not state that it is a binary digit or that it has the value 0 or 1.
A group of 8 bits.
Why: Describes a byte, not a bit; no creditworthy point and named in the Do not accept line.
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