Digital Electronics MCQ Questions and Answers for Practice

1. What are the symbols used to represent digits in the binary number system?

1. 1,2
2. 0,1
3. 0,1,2
4. 0 through 8

2. The sum of 11101 + 10111 equals ________.

1. 100100
2. 110011
3. 110100
4. 100001

3. A binary number's value changes most drastically when the ________ is changed.

1. Duty cycle
2. Frequency
3. LSB
4. MSB

4. The binary number 111 is equal to the decimal number ________.

1. 12
2. 2
3. 5
4. 7

5. Hexadecimal letters A through F are used for decimal equivalent values from:

1. 11 through 17
2. 1 through 6
3. 10 through 15
4. 9 through 14

6. Digital electronics is based on the ________ numbering system.

1. Hexadecimal
2. Decimal
3. Binary
4. Octal

7. The 1's complement of 10011101 is ________.

1. 1100011
2. 1100010
3. 10011110
4. 1100001

8. When using the repeated division by 2 method of converting from decimal to binary, one must write the first remainder as the:

1. MSB
2. MSB, provided the following sequence of remainders are written in descending order until the final remainder is achieved.
3. LSB
4. LSB, provided the final remainder is used to replace the original LSB, which is then moved to the MSB position.

9. The decimal value for E

1. 12
2. 12
3. 10
4. 14

10. Solve this binary problem: 01110010 – 01001000

1. 111100
2. 11010
3. 101010
4. 1110010

11. Which of the following is the most widely used alphanumeric code for computer input and output?

1. EBCDIC
2. Gray
3. ASCII
4. Parity

12. Which is typically the longest?

1. Word
2. Bit
3. Byte
4. Nibble

13. The BCD number for decimal 347 is ________.

1. 1100 1011 0110
2. 1100 1011 1000
3. 0011 0100 0111
4. 0011 0100 0001

14. The sum of the two BCD numbers, 0011 + 0011, is ________.

1. 1100
2. 110
3. 111
4. 11

15. Convert the binary number 1100 to Gray code.

1. 1100
2. 11
3. 1010
4. 1001