4.5: Fundamentals of Data Representation: revision quiz and key terms

Free practice for 4.5: Fundamentals of Data Representation in AQA A Level Computer Science (7517). It has 32 parts, listed below. Try the questions, then check the key terms.

Key terms for 4.5: Fundamentals of Data Representation

Irrational number

A number that cannot be written as a fraction of two integers, such as √2.

Natural number

A positive whole number or zero, used for counting.

Normalisation

Adjusting a floating point number so that it has the maximum possible precision for its mantissa.

Nyquist theorem

States that sound must be sampled at least twice the frequency of its highest component to be reproduced accurately.

Overflow

Occurs when the result of a calculation is too large to be stored in the bits available.

Parity bit

Used to help detect errors in transmitted or stored data.

Rational number

A number that can be written as a fraction of two integers.

Two's complement

A method of representing signed integers in which the most significant bit has a negative place value.

What 4.5: Fundamentals of Data Representation covers

In RADevo this topic has a full topic test and a focused quiz for each part:

• 4.5.1.1 Natural Numbers
• 4.5.1.2 Integer Numbers
• 4.5.1.3 Rational Numbers
• 4.5.1.4 Irrational Numbers
• 4.5.1.5 Real Numbers
• 4.5.1.6 Ordinal Numbers
• 4.5.1.7 Counting and Measurement
• 4.5.2.1 Number Base
• 4.5.3.1 Bits and Bytes
• 4.5.3.2 Units
• 4.5.4.1 Unsigned Binary
• 4.5.4.2 Unsigned Binary Arithmetic
• 4.5.4.3 Signed Binary Using Two's Complement
• 4.5.4.4 Numbers with a Fractional Part
• 4.5.4.5 Rounding Errors
• 4.5.4.6 Absolute and Relative Errors
• 4.5.4.7 Range and Precision
• 4.5.4.8 Normalisation of Floating Point Form
• 4.5.4.9 Underflow and Overflow
• 4.5.5.1 Character Form of a Decimal Digit
• 4.5.5.2 ASCII and Unicode
• 4.5.5.3 Error Checking and Correction
• 4.5.6.1 Bit Patterns, Images, Sound and Other Data
• 4.5.6.2 Analogue and Digital
• 4.5.6.3 Analogue/Digital Conversion
• 4.5.6.4 Bitmapped Graphics
• 4.5.6.5 Vector Graphics
• 4.5.6.6 Vector Graphics versus Bitmapped Graphics
• 4.5.6.7 Digital Representation of Sound
• 4.5.6.8 Musical Instrument Digital Interface (MIDI)
• 4.5.6.9 Data Compression
• 4.5.6.10 Encryption