← IGCSE Computer Science Paper 1

Writing exam answers about artificial intelligence

Use exact key terms (data, rules, reasoning, knowledge base, rule base, inference engine, interface, machine learning) and link each point to a reason.

Part of: IGCSE Computer Science 0478 — 6.3 Artificial Intelligence — Module 26

Understanding Writing exam answers about artificial intelligence in IGCSE Computer Science Paper 1

What it does: A full-mark answer keeps the two parts separate: the knowledge base holds facts and the rule base holds the rules. AI is software that behaves intelligently. It does not have to be a robot. Use key terms such as data, rules, reasoning and learning. The inference engine does the reasoning. The screen the user types into is the interface. Use the exact key terms and give a reason. Vague words like 'clever' or 'smart' do not earn marks.

Common mistakes: AI does not mean a robot. A full-mark definition says AI is a computer system that behaves in an intelligent way, e.g. 'AI: a computer acting smartly'. The knowledge base stores the facts (data). The rules are held in the rule base, so line 2 should say 'facts'.

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This module's key terms are also in a printable crossword (Modules 662–678) and word search (Modules 652–678).

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Learning

Duo

Which sentence is the best one-sentence definition of AI for an exam answer?

AI is a robot that thinks and acts like a human.AI is a computer system that shows intelligent behaviour by using data and rules, reasoning and learning.

Matches

AI means a robot

↓

AI is not a robot. It is a computer system showing intelligent behaviour using data, rules and reasoning, and it may have no physical body.

Applying

Meanings

Term

key term + reason

Meaning

Use exact key terms (data, rules, reasoning, knowledge base, rule base, inference engine, interface, machine learning) and link each point to a reason.

Practice

AI uses data and rules, so it can decide.

Testing

Gaps

behaviour.

Check Answer

Spots

1AI: a robot with a body

2It has data and rules

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Quick Questions

1. Which sentence is the best one-sentence definition of AI for an exam answer?

A. AI is a computer system that shows intelligent behaviour by using data and rules, reasoning and learning. ✓

B. AI is a robot that thinks and acts like a human.

AI is software that behaves intelligently. It does not have to be a robot. Use key terms such as data, rules, reasoning and learning.

2. Which answer lists the characteristics of AI correctly?

A. A screen, a keyboard and a mouse.

B. A collection of data and rules, the ability to reason, and the ability to learn and adapt. ✓

The three AI characteristics are data and rules, reasoning, and learning and adapting. Input and output devices are not AI characteristics.

3. A student writes: 'The knowledge base holds the if-then rules.' Is this correct?

A. No. The rule base holds the rules. The knowledge base holds the facts and data. ✓

B. Yes. The knowledge base holds the rules.

Do not mix up the two parts. Knowledge base means facts and data. Rule base means the rules, usually IF-THEN.

4. Which answer describes the inference engine so that it earns the mark?

A. It reasons by matching the user's answers to the rules in the rule base and the facts in the knowledge base to reach a conclusion. ✓

B. It is the screen where the user types in their answers.

The inference engine does the reasoning. The screen the user types into is the interface.

5. Which answer links the interface to a reason, as a full-mark answer should?

A. The interface is the part of the system that stores all the facts.

B. The interface lets the user enter questions and answers, so the system can use them and then show the conclusion. ✓

A full-mark answer names the term and gives its purpose. The interface handles communication between the user and the system. The knowledge base stores the facts.

Match the Pairs

AI = data + rules + reasoning → A one-sentence definition: a computer system that stores data and rules and reasons to behave intelligently

ML = learn + adapt own data → Machine learning: a system that learns from experience and changes its own processes or data to improve

Name each expert system part and give its job: the knowledge base stores facts, the rule base stores IF-THEN rules → knowledge base = facts; rule base = rules

Link a point to a reason: the inference engine uses the rules to reach a conclusion, so it acts as the reasoning part → inference engine -> rules -> conclusion

AI means a robot → AI is not a robot. It is a computer system showing intelligent behaviour using data, rules and reasoning, and it may have no physical body.

Rule base = stores facts about the topic → This mixes up the two parts. The knowledge base stores the facts, while the rule base stores the rules used to reach a conclusion.

Key Term

key term + reason

Use exact key terms (data, rules, reasoning, knowledge base, rule base, inference engine, interface, machine learning) and link each point to a reason.

Fill in the Blanks

1. AI is a computer system that shows intelligent behaviour.

Hint: Type the adjective that describes the kind of behaviour AI copies from people.

2. AI has data and rules, can reason, and can learn and adapt.

Hint: Type the verb for the characteristic where AI improves from experience.

3. The knowledge base stores facts as data.

Hint: Type the expert system part that holds the facts, not the rules.

4. The inference engine applies rules to the facts to reach a conclusion.

Hint: Type the expert system part that does the reasoning by applying rules to facts.

5. Machine learning: a system adapts its own processes or data using what it learns.

Hint: Type the verb meaning the system changes itself using experience.

Spot the Error

Question 1

A AI: a robot with a body

B It has data and rules

C It can reason, learn and adapt

Line A — AI does not mean a robot. A full-mark definition says AI is a computer system that behaves in an intelligent way, e.g. 'AI: a computer acting smartly'.

Question 2

A Expert system parts:

B 1 Knowledge base: the rules

C 2 Rule base: IF-THEN rules

D 3 Inference engine: reasons

Line B — The knowledge base stores the facts (data). The rules are held in the rule base, so line 2 should say 'facts'.

Question 3

A Machine learning is when a

B program follows fixed steps

C or processes, without being

D reprogrammed by a person

Line B — Machine learning means the program adapts its own data or processes. Following fixed steps describes a normal program, so the line should say 'program adapts its own data'.

Question 4

A Answer: chess program is AI

B It has data and rules (moves)

C It always plays a random move

D so it shows intelligence

Line C — Random moves are not reasoning. A full-mark answer says the program reasons to pick the best move, and links that to showing intelligence.

Question 5

A Inference engine:

B - searches the rule base

C - matches the facts given

D - so it stores all the facts

Line D — Storing facts is the job of the knowledge base. The inference engine's reason for searching and matching is to reach a conclusion.

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