Answer / mayank gupta

The output Voltage is high that is 5V if the input to the gate is 4V and 5V and the supply voltage of the gate is 5V. Now if
each voltage is decreased by .52V then the 4v volt output will become 3.48V which is the undefined state for a Gate. Hence, the output cannot be predicted. If it reads it as low then the output will be lying between 0-0.8V and considered as low. If it reads high then the output will between 4.5-5V considered as high.

Answer / jc

If two input voltages r same , then they r taken as "High" i.e. 1 , irrespective of their polarity. But if voltages are different , then more positive voltage among both input voltage will b taken as 1 n other as 0 , so output would b zero.

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