Digital Electronics & Microprocessor (DEM MCQ) Multiple Choice Questions and Answers
1. Truth table is used to express :
Answer : A
Explanation : None
2. 1’s complement of 11001010 is given by :
Answer : C
Explanation : None
3. The time required for a gate or inverter to change its state is called :
Answer : C
Explanation : None
4. The minimum number of transistors can be used by 2 input AND gate is __________
Answer : A
Explanation : In AND gate minimum number of transistors can be used by 2 input and maximum number of transistors up to 3 imput.
5. A microprocessor is ALU and ______
Answer : D
Explanation : None
DEM MCQ 2018
6. The Boolean expression A’B+AB’+AB is equivalent to :
Answer : D
Explanation : A’B+AB’+AB = A’B+A(B’+B) = A’B+AB {Formula,X+X’=X} = B(A’+A) = BA
7. K-map is used for the purpose :
Answer : C
Explanation : None
8. EPROM contents can be erased by exposing it to :
Answer : A
Explanation : None
9. The gates required to build a half adder are :
Answer : C
Explanation : None
10. The number of output pins of a 8085 microprocessor are :
Answer : A
Explanation : None
DEM MCQ 2018
11. Which one of the following is 8-bit register in microprocessor :
Answer : C
Explanation : The registers, PSW, TCON and Accumulator are 8-bit registers.
12. General purpose registers in a 8085 microprocessor are :
Answer : A
Explanation : General Purpose register pairs – BC, DE, and HL, to perform some 16-bit operation.
13. The use of OP-AMP is generally not preferred as :
Answer : B
Explanation : None
14. Which of the following is an universal gate ?
Answer : C
Explanation : None
15. In Boolean Algebra the plus sign (+) indicates :
Answer : B
Explanation : None
DEM MCQ 2018
16. The unit that performs the arithmetic and logical operation on the stored number is known as :
Answer : A
Explanation : None
17. LEDs are usually switched ON and OFF by :
Answer : B
Explanation : None
18. A stack pointer is ______ bit register in 8085 microprocessor
Answer : C
Explanation : None
19. Flip-flops comes in the category of :
Answer : B
Explanation : None
20. The solution of (10000-1111) is given by :
Answer : A
Explanation : None