Digital electronics-Digital Fundamentals-Unit1 Sample MCQ

MCQ PREPARATION

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: F=AB+CD F=A+B.C+D 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: F=AB+AC F=AC+B.C F=B’C+A+C D. F=B’A+AC’

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