Lesson 1.4.3b
1.4.3b Logic gates, truth tables, flip-flops, half and full adders Quiz: OCR Computer Science, Unit 4
20 questions
In partnership with Revision Ninja
Lesson 1.4.3b, Logic gates, truth tables, flip-flops, half and full adders: 20 multiple choice questions for the OCR Computer Science (H446), Unit 4: Data types, data structures and algorithms, written with Revision Ninja.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
Which logic gate outputs 1 only when both of its inputs are 1?
- XOR
- OR
- AND
- NAND
-
Which logic gate outputs 1 when its inputs are different from each other?
- AND
- XNOR
- XOR
- NOR
-
Which logic gate is created by placing a NOT gate directly after an AND gate?
- NAND
- XOR
- NOR
- XNOR
-
What is the output of a NOR gate when both inputs are set to 0?
- High impedance
- Undefined
- 1
- 0
-
What are the two output signals produced by a half adder circuit?
- Bit and Byte
- Data and Clock
- Sum and Remainder
- Sum and Carry
-
Which logic gate calculates the Sum output in a standard half adder circuit?
- XOR
- AND
- OR
- NAND
-
Which logic gate calculates the Carry output in a standard half adder circuit?
- NAND
- OR
- AND
- XOR
-
How many inputs does a single full adder circuit accept?
- 2
- 3
- 1
- 4
-
What is the primary function of a D-type flip-flop circuit?
- Multiplying frequencies
- Adding binary numbers
- Inverting signals
- Storing 1 bit
-
What are the two main inputs to a D-type flip-flop?
- Enable and Output
- Sum and Carry
- Data and Clock
- Set and Reset
-
On which event does a D-type flip-flop update its output value?
- Clock edge
- Clock cycle
- Data change
- Input pulse
-
How many rows are required in a truth table for three logic inputs?
- 3
- 9
- 8
- 6
-
Which of the following is considered a universal logic gate?
- OR
- NAND
- AND
- XOR
-
What is the Boolean output expression for an XNOR gate given inputs A and B?
- A OR NOT B
- A AND NOT B
- NOT (A AND B)
- NOT (A XOR B)
-
What are the Sum and Carry outputs of a half adder when inputs are A=1 and B=1?
- Sum 0, Carry 1
- Sum 0, Carry 0
- Sum 1, Carry 0
- Sum 1, Carry 1
-
What are the Sum and Carry outputs of a full adder when A=1, B=1, Cin=1?
- Sum 0, Carry 0
- Sum 0, Carry 1
- Sum 1, Carry 1
- Sum 1, Carry 0
-
Which computer memory component is constructed using arrays of flip-flops?
- Dynamic RAM
- Optical disc
- Static RAM
- Hard disk drive
-
Which type of multi-bit adder passes the carry output directly to the next adjacent stage?
- Ripple carry adder
- Parallel sum adder
- Series flip-flop adder
- Lookahead subtraction unit
-
What limit is created by propagation delay in a ripple carry adder?
- Reduced bit width
- Data loss
- Increased power usage
- Slower operating speed
-
Which components are combined with an OR gate to construct a full adder?
- One half adder
- Two half adders
- Three half adders
- Two flip-flops
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