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5 marksLogic Gates

CAPE Physics Unit 2 · 2009 · Paper 2 · Question 2(b)(ii)

A logic circuit designed to operate a lamp using switches S1 and S2 connected to logic gates.

Complete the truth table in Figure 4 for the logic circuit.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 2(a)(i)Complete the truth table to show the action of a NOR gate.[1 mark]
  2. 2(a)(ii)Draw a diagram showing how a NOR gate can be connected to function as a NOT gate.[1 mark]
  3. 2(a)(iii)Add connecting wires to the provided diagram of four NOR gates (Figure 2) to show how they can be connected together to form a NAND gate.[4 marks]
  4. 2(b)(i)State the logic state of B when switch S2 is closed.[1 mark]
  5. 2(b)(iii)State which logic combination of S1 and S2 will cause the lamp to be ON.[1 mark]
  6. 2(b)(iv)Draw a logic circuit showing how NAND gates exclusively can be used to perform the identical function of the circuit in Figure 3.[2 marks]

More practice: the rest of this paper · more Logic Gates questions · all CAPE Physics Unit 2 past papers