Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-PX-DL-0011 markL1 FoundationCalculatorLogic gates

A NAND gate has inputs

A=1

and

B=1

. Its output is

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SA-PX-DL-0021 markL1 FoundationCalculatorLogic gates

State the number of rows in a truth table for a circuit with

3

inputs.

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SA-PX-DL-0031 markL1 FoundationCalculatorLogic gates

An XOR gate gives an output of

1

when

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SA-PX-DL-0041 markL1 FoundationCalculatorCounters

State the number of different states of a 4-bit binary counter.

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SA-PX-DL-0081 markL1 FoundationCalculatorCounters

A BCD counter resets to zero after reaching

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SA-PX-DL-X011 markL1 FoundationCalculatorLogic gates

State the output of an AND gate with inputs

A=1

B=0

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SA-PX-DL-X021 markL1 FoundationCalculatorLogic gates

Convert the binary number

1101

to decimal.

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SA-PX-DL-X031 markL1 FoundationCalculatorCounters

State the number of states of a 5-bit binary counter.

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SA-PX-DL-0052 marksL2 StandardCalculatorCounters

1600

Hz clock drives a 4-bit binary counter. Calculate the frequency of the most significant output bit in Hz.

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SA-PX-DL-0061 markL2 StandardCalculatorLogic gates

For

Q=\overline{A+B}

(a NOR gate), state the number of input combinations that give

Q=1

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SA-PX-DL-X041 markL2 StandardCalculatorCounters

800

Hz clock drives a binary counter. Calculate the frequency of the third output bit (bit 2, counting from bit 0) in Hz.

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SA-PX-DL-0072 marksL3 ExamCalculatorLogic gates

For

Q=\overline{A\cdot B}+C

, state how many of the

8

input combinations give

Q=0

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