Multiple Choice Questions 10×1=10
1
Which logic gate outputs true only if both inputs are true?
A
OR gate
B
AND gate
C
XOR gate
D
NOT gate
2
What is the output of a NOT gate if the input is 1?
A
0
B
1
C
2
D
None of these
3
What is the purpose of a Digital to Analog Converter (DAC)?
A
To convert digital signals to analog signals
B
To convert analog signals to digital signals
C
To amplify digital signals
D
To store digital signals
4
Which of the following is NOT a characteristic of digital signals?
A
Binary representation
B
Continuous waveform
C
Both A and B
D
None of these
5
What is the main reason for using digital signals in communication systems?
Digital vs Analog: Digital signals are less prone to noise and distortion
A
They are easier to generate
B
They are less affected by noise
C
They require less bandwidth
D
They are continuous
6
Which of the following is a disadvantage of digital systems compared to analog systems?
A
They are more complex to design
B
They are less accurate
C
They are slower
D
None of these
7
What is the binary representation of the decimal number 10?
A
1010
B
1001
C
1100
D
1111
8
Which of the following is true about analog signals?
Hint: Analog signals are continuous while digital signals are discrete
A
They are discrete
B
They can have infinite values within a range
C
They are used in digital computers
D
They are less affected by noise
9
Which of the following is a step in simplifying Boolean expressions using Karnaugh maps?
A
Grouping 1s in powers of two
B
Grouping 0s in powers of two
C
Both A and B
D
None of these
10
Which of the following is used to represent a NAND gate in a logic diagram?
A
A triangle with a line
B
A rectangle with a straight line
C
A circle with a plus sign
D
None of these
Short Answer Questions 10×2=20
I
Describe the function of a NOT gate with its truth table.
II
What characteristic distinguishes analog signals from digital signals in terms of continuity?
III
Convert the binary number 1101 to its decimal equivalent.
Method: Multiply each bit by 2position and sum
IV
Draw the symbol for a NAND gate.
V
Which law states A+(B·C)=(A+B)·(A+C)?
Distributive Law: A + (B·C) = (A+B)·(A+C)
VI
What is the purpose of the Consensus Theorem?
VII
Simplify \( \overline{\overline{A}} \) using the Double Negation Law.
VIII
How many AND gates are needed to implement (A·B)+(C·D)?
IX
What components are required to build a full-adder?
X
Sketch the logic diagram for F=A+B·C.