This exam tips covers Exam Tips - Logic Gates within Logic Gates for GCSE Computer Science. Revise Logic Gates in Boolean Logic for GCSE Computer Science with 15 exam-style questions and 20 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 8 of 8 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 8 of 8
Practice
15 questions
Recall
20 flashcards
Exam Tips - Logic Gates
Drawing gate symbols:
- AND gate: Draw a D-shape (flat back, curved front)
- OR gate: Draw a pointed shape (curved back, pointed front)
- NOT gate: Draw a triangle with a small circle (bubble) at the output
- The bubble ALWAYS means NOT (inversion)
Common exam mistakes to avoid:
- Forgetting that AND requires ALL inputs to be 1 - not just one!
- Confusing AND and OR symbols - remember AND is D-shaped, OR is pointed
- Missing the NOT bubble - it's essential for showing inversion
- Wrong truth table: AND has only ONE 1 (bottom row), OR has only ONE 0 (top row)
Quick truth table memory tricks:
- AND: Think "strict gate" - only 1,1 passes through → gives 1
- OR: Think "generous gate" - only 0,0 blocks → gives 0
- NOT: Think "flip gate" - whatever goes in, opposite comes out