IGCSE Computer Science Paper 2 Crossword: 9 Databases and 10 Boolean Logic (Modules 539–551)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
1
2
3
4
5
6
7
8
9
Across
- 4. A gate with two inputs that outputs 0 only when both inputs are 1. It is the opposite of AND (AND followed by NOT). Its truth table output is 1 1 1 0. Written X = A ______ B. (4)
- 5. Word 2 of the term in 1 Down: _____ ____ (4)
- 6. A ______ listing every input combination in its rows, with the output in the last column. Two inputs give 2^2 = 4 rows, in the order 00, 01, 10, 11. Word 1 of: _____ _____ (5)
- 7. A mistake in an ______ script, such as text without quotes, > instead of >=, AND instead of OR, clauses in the wrong order, a missing table after FROM or a missing semicolon. Word 1 of: ___ _____ (3)
- 9. Word 2 of the term in 7 Across: ___ _____ (5)
Down
- 1. An electronic component that takes one or two binary inputs (0 or 1) and gives one binary output (0 or 1) by a fixed rule. Processors are built from many gates. Word 1 of: _____ ____ (5)
- 2. NOT has exactly one ______. AND, OR, NAND, NOR and XOR each have exactly two inputs. No three-______ gates in this course, so join two gates for three inputs. Word 3 of: ___: 1 _____, ______: 2 (5)
- 3. Word 4 of the term in 2 Down: ___: 1 _____, ______: 2 (6)
- 6. Word 2 of the term in 6 Across: _____ _____ (5)
- 8. A logic gate with one input that outputs the opposite value: 0 becomes 1 and 1 becomes 0. It is drawn as a triangle with a small circle and written X = ______ A. (3)
Answer Key
IGCSE Computer Science Paper 2 · Modules 539–551
1L
2I
O
3O
4N
A
N
D
5G
A
T
E
P
I
H
6T
R
U
T
H
C
E
A
T
R
B
7S
Q
L
8N
9E
R
R
O
R
T
Across
4NAND — A gate with two inputs that outputs 0 only when both inputs are 1. It is the opposite of AND (AND followed by NOT). Its truth table output is 1 1 1 0. Written X = A ______ B.
5GATE — Word 2 of the term in 1 Down: _____ ____
6TRUTH — A ______ listing every input combination in its rows, with the output in the last column. Two inputs give 2^2 = 4 rows, in the order 00, 01, 10, 11. Word 1 of: _____ _____
7SQL — A mistake in an ______ script, such as text without quotes, > instead of >=, AND instead of OR, clauses in the wrong order, a missing table after FROM or a missing semicolon. Word 1 of: ___ _____
9ERROR — Word 2 of the term in 7 Across: ___ _____
Down
1LOGIC — An electronic component that takes one or two binary inputs (0 or 1) and gives one binary output (0 or 1) by a fixed rule. Processors are built from many gates. Word 1 of: _____ ____
2INPUT — NOT has exactly one ______. AND, OR, NAND, NOR and XOR each have exactly two inputs. No three-______ gates in this course, so join two gates for three inputs. Word 3 of: ___: 1 _____, ______: 2
3OTHERS — Word 4 of the term in 2 Down: ___: 1 _____, ______: 2
6TABLE — Word 2 of the term in 6 Across: _____ _____
8NOT — A logic gate with one input that outputs the opposite value: 0 becomes 1 and 1 becomes 0. It is drawn as a triangle with a small circle and written X = ______ A.