Computer systems

Complete the truth table for the XOR logic gate.

A game uses three sensors. A red light (R) in the game switches on if **all** of the following conditions are true: - sensor D is off - sensor L is on - sensor W is on. Complete the logic circuit for this game. You **must** use the correct symbols for the logic gates.

Another circuit in the game will output True if any two sensors are activated or if all three sensors are activated. This has been represented as the Boolean expression: (W . D) + (D . L) . (W . L) The expression contains an error. Shade **one** lozenge that shows the expression with the error corrected.

A green light (G) in the game switches on if **all** of the following conditions are true: - sensor D is off - sensor L is off - sensor W is on. Write a Boolean expression for this logic circuit. You **must** use Boolean expression operators in your answer.

Describe what is meant by the terms system software and application software.

State **four** functions of an operating system.

Programming languages can be classified as low-level or high-level. Which of these statements is true about code written using a low-level language instead of a high-level language?

From the list of statements about low-level languages, identify another true statement.

Assemblers and interpreters are two types of program translator. State the purpose of an assembler.

Explain how an interpreter works.

State **two** reasons why computers have more RAM than cache memory.

Data is increasingly being stored 'in the cloud'. State **two** advantages of using cloud storage instead of local storage.

Many new computers use solid-state storage for secondary storage rather than magnetic storage. Explain why solid-state storage is **not** fitted to every new computer.