IGCSE Paper 1 (Part 1) - Computer Science

Since computers only understand an electrical current being either on or off, it needs to use patterns of ones and zeros representing on or off as its own language. This language is called _______.

• Hexadecimal

• Binary

• Octa

• Denary

A computer system coverts data in binary using special circuits called _______.

• analogue circuit

• series circuit

• parallel circuit

• logic circuit

Once data has been processed, it is temporarily stored in a ________ – a small but quickly accessible memory location available to a computer’s Central Processing Unit (CPU).

• RAM

• register

• ROM

• bus

Convert 0 0 1 0 0 1 1 0 to denary.

Convert 000111011 to hexadecimal.

Convert 163 to binary.

Convert denary 789 to hexadecimal.

Hexadecimal is used to represent ______.

• colours in webpages

• error messages

• colours webpages and error messages

• none of those

The largest denary number you can represent in an 8-bit binary number is 255. Every computer system has a predetermined limit that it can represent – for example, modern computer systems use 64-bit registers. If a computer system attempts to represent a number larger than what will fit inside its registers, an ________ error will occur.

• overdue

• overrun

• overflow

• overtake

Performing ______ shifts affects the value of a binary number stored in a computer system.