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Q#1
Boolean Algebra
GATE EE 2013
MCQ
+1 mark
-0.33 marks
A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles
an AND gate
an OR gate
an XOR gate
a NAND gate
Explanation:
Bulb (ON) 
1
Bulb (OFF) 0
If both switches are operated bulb will remain in previous state
If either switch is operated bulb change its state
Let the switches be S1 S2 and bulb states Y.
Case-1
We can see that this truth table resembles XOR gate
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