Basics of AND gate and its application in car wiper control

Which of the following is a digital device?
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A binary digit is called as
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A one bit multiplier can be accomplished using which type of gate?
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If the input waveform A is applied to the AND gate shown, which of the given options will represent the output waveform?

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A washing machine dryer dries the clothes only if the timer is set above zero and the machine door is closed. The equivalent Boolean expression can be best represented by which of the following gates?
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