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1

What are logic gates?

Easy 1 Mark

Think about the smallest components that process 0s and 1s in a circuit.

A Software programs that filter internet data

B Fundamental building blocks of digital circuits that perform logical operations on binary inputs

C Physical keys used to lock computer cases

D Hardware components used to store data permanently

2

What mathematical system is used to analyse and design logic circuits?

Easy 1 Mark

Who developed the algebra used in digital circuit design?

A Calculus

B Algebra

C Boolean Algebra

D Trigonometry

3

Boolean Algebra was developed by:

Easy 1 Mark

The algebra is named after its inventor.

A Alan Turing

B George Boole

C Charles Babbage

D John von Neumann

4

In Boolean Algebra variables can have only:

Easy 1 Mark

Think about the two states of a digital system.

A Any real number value

B Values from 0 to 9

C Only the values 0 or 1

D Positive integers only

5

Digital computers process information in the form of:

Easy 1 Mark

What are the only two states a digital system can be in?

A Decimal signals (0 to 9)

B Analogue voltage levels

C Binary signals (0 and 1)

D Hexadecimal codes only

6

What does an AND gate do?

Easy 1 Mark

ALL conditions must be true for the AND output to be true.

A Produces output 1 if at least one input is 1

B Produces output 1 only when ALL inputs are 1

C Inverts the input signal

D Produces output 0 only when all inputs are 1

7

What is the Boolean expression for an AND gate with inputs A and B?

Easy 1 Mark

AND uses the multiplication dot symbol.

A A + B

B A - B

C A · B

D A xor B

8

For an AND gate with inputs A=1 and B=0 what is the output?

Easy 1 Mark

Remember: AND needs ALL inputs to be 1.

A 1

B 0

C Undefined

D Depends on voltage

9

For an AND gate with inputs A=1 and B=1 what is the output?

Easy 1 Mark

AND gate is like logical multiplication: 1×1=1.

A 0

B Undefined

C 1

D 2

10

What does an OR gate produce?

Easy 1 Mark

OR is satisfied by ANY one true input.

A Output 1 only when all inputs are 1

B Output 1 if at least one input is 1

C Always output 0

D The opposite of the input

11

What is the Boolean expression for an OR gate with inputs A and B?

Easy 1 Mark

OR uses the plus symbol representing logical addition.

A A · B

B A - B

C A + B

D A xor B

12

For an OR gate with inputs A=0 and B=0 what is the output?

Easy 1 Mark

OR produces 0 only when every input is 0.

A 1

B 0

C Undefined

D Both 0 and 1

13

For an OR gate with A=1 and B=0 what is the output?

Easy 1 Mark

OR needs only one input to be 1.

A 0

B 1

C Undefined

D Depends on power supply

14

An alarm activates if EITHER a door sensor OR a window sensor detects movement. Which gate models this?

Easy 1 Mark

Which gate is satisfied when any single input is true?

A AND gate

B NOT gate

C OR gate

D NAND gate

15

How many inputs does a NOT gate have?

Easy 1 Mark

NOT gate is the simplest gate — it only needs to invert one signal.

A Two inputs

B Three inputs

C One input

D Four inputs

16

What is the Boolean expression for a NOT gate with input A?

Easy 1 Mark

NOT is represented by a prime symbol or a bar over the variable.

A A · B

B A + B

C A xor B

D A prime (A)

17

For a NOT gate with input A=1 what is the output?

Easy 1 Mark

NOT means opposite — flip the input value.

A 1

B 0

C Undefined

D 2

18

For a NOT gate with input A=0 what is the output?

Easy 1 Mark

NOT gate always gives the opposite of its input.

A 0

B 1

C Undefined

D Depends on circuit

19

What are the two universal logic gates?

Easy 1 Mark

These two gates each have NAN- or NOR- in their names.

A AND and OR

B AND and NOT

C NAND and NOR

D OR and NOT

20

What combination of gates makes a NAND gate?

Easy 1 Mark

NAND = NOT + AND — the name tells you the combination.

A OR gate followed by NOT gate

B AND gate followed by NOT gate

C NOT gate followed by AND gate

D Two NOT gates combined

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