Q.

The circuit diagram (see figure) shows a 'logic combination'  with the states outputs X, Y and Z given for inputs P, Q, R and S all at state 1 (i.e., high). When inputs P and R change to state 0 (i.e. low) with inputs Q and S still at 1, the condition of output X, Y and Z changes to

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a

X-1; Y-0; Z-0

b

X-1; Y-1; Z-1

c

X-0; Y-1; Z-0

d

X-0; Y-0; Z-1

answer is C.

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Detailed Solution

The following arguments shall help us to arrive at the right choice.(i) AND gate shall not respond to zero input.(ii) Since R is zero and S is 1, therefore NOR gate gives zero. NOT gives '1' correspond to 0(iii) NOR gate would not respond to 0 and 1.
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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Best Online Course for NEET
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The circuit diagram (see figure) shows a 'logic combination'  with the states outputs X, Y and Z given for inputs P, Q, R and S all at state 1 (i.e., high). When inputs P and R change to state 0 (i.e. low) with inputs Q and S still at 1, the condition of output X, Y and Z changes to