Physics · May / June 2020 · Paper 41 · Question 9
0625
As printed in the paper
Show the answer and mark scheme
9(a)[2]
digital signal: consists of high and low states / voltages
analogue signal: continuously varying voltage
9(b)(i)[1]
AND gate
OR gate
AND
9(b)(ii)[1]
when the inputs differ AND ‘AND gate’ produces 0 AND ‘OR gate’ produces 1
9(c)(i)[1]
both inputs to upper NOR gate are 0s
9(c)(ii)[3]
two (identical) inputs to NAND gate are 1s
lower input to lower NOR gate is 1
output Q is 0
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