This document contains a sample of 15 multiple choice questions from a Digital Electronics unit exam covering topics like binary, hexadecimal, Boolean algebra, logic gates and circuits. The questions test knowledge of concepts like the smallest unit of binary data (bit), representation of decimal numbers in binary, analog vs digital signals, Moore's Law, minimizing Boolean expressions, implementing logic with gates and interpreting logic circuits. The correct answers are provided after each question.

1. R.M K COLLEGE OF ENGINEERING & TECHNOLOGY
DEPARTMENT OF ECE
DIGITAL ELECTRONICS
UNIT 1 SAMPLE MCQ -PART A QUESTIONS

2. 1. The smaller unit of binary data
a) Nibble
b) Bit
c) Byte
d) word
2. A 64 bit word consists of
a) 4 bits
b) 4 bytes
c) 8 bytes
d) 8 bits
Correct Answer : B
Correct Answer : C

3. 3. Nibble is a collection of
a) 8 bits
b) 16 bits
c) 2bits
d) 4 bits
4. How many possible values for digital signals?
a) 4
b) 2
c) 8
d) 1
Correct Answer : D
Correct Answer : B

4. 5. Which number system has a base of 16
a) Decimal
b) Octal
c) Hexadecimal
d) Binary
6. Binary representation of decimal number (18)10 is
a) (10000)2
b) (10010)2
c) (10001)2
d) (10100)2
Correct Answer : C
Correct Answer : B

5. 7.Which of the following statement is not correct?
a) Noise is an analog signal
b) Variation of resistance in Light Dependent Resistor is an analog signal
c) Human voice is a digital signal
d) Room temperature measured during a particular period is an analog signal
Correct Answer : C

6. 8.Moore’s law states that:
a. The cost of semiconductor tools doubles every four years
b. The cost of semiconductor tools doubles every two years
c. The number of transistors on a chip double annually
d. The number of transistors on a chip doubles every four years
Correct Answer : C

7. 9.Boolean expression can be minimized using
a) Algebraic Method
b) De-morgan’s Law
c) Karnaugh Map
d) Both a & c
Correct Answer : D

8. 10.The SOP expression F=AB+CD is equivalent to the POS expression
a) (A+B) (C+D)
b) (A+C)(B+C)(A+D)(B+D)
c) (A+B) (C+D’)
d) (A+B) (C+D) (B+D)
Correct Answer : B

9. 11. Product-of-Sums expressions can be implemented using
a) 2-level OR-AND logic circuits
b) 2-level NOR logic circuits
c) 2-level XOR logic circuits
d) both option a & b is correct
Correct Answer : D

10. 12.Interpret the following logic Circuit as Boolean expression:
Correct Answer : D
OPTIONS:
A. F=AB+CD
B. F=A+B.C+D
C. F=AC+BD
D. F=AB’+C’D

11. Correct Answer : C
14. Give the dual of the Boolean expression (B’ + C) . A. C
OPTIONS:
A. F=AB+AC
B. F=AC+B.C
C. F=B’C+A+C
D. F=B’A+AC’

12. 15. Which are called Universal gates ?
OPTIONS:
A. NAND
B. NOR
C. Both A &B
D. A or B
Correct Answer : C