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4 marksLogic Gates

CAPE Physics Unit 2 · 2002 · Paper 2 · Question 7(c)(i)

A room lamp is controlled by switches at the front and back doors: the lamp is ON if exactly one switch is ON, and OFF if both are OFF or both are ON. Draw a logic circuit to meet these requirements, showing the associated truth table.

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Other parts of this question

  1. 7(a)Explain the shape of the gain-frequency response curve for an operational amplifier shown in Figure 10.[5 marks]
  2. 7(b)(i)Distinguish between an analogue circuit and a digital circuit.[2 marks]
  3. 7(b)(ii)Write the truth table for a NAND gate.[1 mark]
  4. 7(b)(iii)Determine the output waveform X for the NAND gate circuit shown in Figure 11 when inputs A and B are applied.[3 marks]
  5. 7(c)(ii)Using two OR gates, one AND gate, and three INVERTERs, show how to design a half adder circuit.[3 marks]
  6. 7(c)(iii)Draw the resulting truth table for the sum and carry outputs of the half adder.[2 marks]

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