Test Series - computer fundamental

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Test Number 24/95

Q: Electronic circuits that operate on one or more input signals to produce standard output _______
A. Series circuits
B. Parallel Circuits
C. Logic Signals
D. Logic Gates
Solution: The logic gates operate on one or more input signals to produce a standard output.
Logic gates give the output in the form of 0 and 1.
The Boolean algebra can be applied to the logic gates.
Q: Logic Gates are the building blocks of all circuits in a computer.
A. True
B. False
C. none
D. ..
Solution: The statement is true.
Logic gates are idealized to implement a boolean function in all circuits of a computer.
The signals are directed as per the outputs of the logic gates in the form of 0 and 1.
Q: A __________ gate gives the output as 1 only if all the inputs signals are 1.
A. AND
B. OR
C. EXOR
D. NOR
Solution: The AND gate gives a 1 only if all the input signals are 1.
The Boolean expression for evaluating an AND signal is: Y=A.B.
Q: The boolean expression of an OR gate is _______
A. A.B
B. A’B+AB’
C. A+B
D. A’B’
Solution: An OR gate gives the result as 1 if any one of the inputs is one.
Its expression is A+B.
An OR gate gives a 0 only if both the inputs are 0.
Q: The gate which is used to reverse the output obtained is _____
A. NOR
B. NAND
C. EXOR
D. NOT
Solution: NOT gate is used to reverse the output from 0 to 1 and vice-versa.
The Boolean expression for NOT gate is Y=A’.
Therefore, it gives the complement of the result obtained.
Q: Which of the following gate will give a 0 when both of its inputs are 1?
A. AND
B. OR
C. NAND
D. EXOR
Solution: The NAND gate gives 0 as the output when both of its inputs are 1 or any one of the input is 1.
It returns a 1 only if both the inputs are 0.
Q: When logic gates are connected to form a gating/logic network it is called as a ______________ logic circuit.
A. combinational
B. sequential
C. systematic
D. hardwired
Solution: It is referred to as a combinational circuit as it comprises a number of gates.
It is connected to evaluate a result of a Boolean expression.
Q: The universal gate that can be used to implement any Boolean expression is __________
A. NAND
B. EXOR
C. OR
D. AND
Solution: NAND gate can be used to implement any Boolean expression.
It is a universal gate. A universal gate can be used to implement any other Boolean function without using any other logic gate.
Q: The gate which is called an inverter is called _________
A. NOR
B. NAND
C. EXOR
D. NOT
Solution: Inverter is used to reverse the output. A NOT gate is used to invert or change the output from 0 to 1 and vice-versa.
Q: The expression of an EXOR gate is ____________
A. A’B+AB’
B. AB+A’B’
C. A+A.B
D. A’+B’
Solution: The expression for an EXOR gate is A’B+AB’.
An EXOR gate is nothing but an exclusive OR gate.

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