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Electronics Engineering Objective Questions { Digital Circuit and Microprocessor }



22. In negative logic, the logic state 1 corresponds to 15 ?10 037
A. negative voltage
B. zero voltage
C. more negative voltage
D. lower voltage level
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23. The output of a 2-input OR gate is zero only when its
A. both inputs are 0
B. either input is 1
C. both inputs are 1
D. eigher input is 0
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24. An XOR gate produces an output only when its two inputs are
A. high
B. low
C. different
D. same
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25. s
A. ON
B. positive
C. high
D. OFF
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26. For getting an output from an XNOR gate, its both inputs must be
A. high
B. low
C. at the same logic level
D. at the opposite logic level
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27. In a certain 2-input logic gate, when A = 0, B = 0, then C= I. It must be gate.
A. XOR
B. AND
C. NAND
D. NOR
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28. . Boolean algebra is essentially based on
A. symbols
B. logic
C. truth
D. numbers
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