waecE-LEARNING
Electronics Paper 2, Nov/Dec. 2011  
Questions: 1 2 3 4 5 6 7 8 9 10 Main
General Comments
Weakness/Remedies
Strength















Question 9

(a)      Define the term logic gate.           
(b)     Show with the aid of combinational logic gates how the following can be derived from a NAND gate:

          (i)      NOT gate;
          (ii)      AND gate;
          (iii)     OR gate.

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OBSERVATION


The expected answers were:

(a)      A logic gate is a circuit that has one or more input but only one output signal.

(b)     (i)      NOT gate
   Electronic Image    

The question was on Logic gates. The question was popular with the candidates. The performance was fairly good.

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