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Welcome to the 8085 Microprocessor MCQs Page

Dive deep into the fascinating world of 8085 Microprocessor with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 8085 Microprocessor, a crucial aspect of Computer Architecture. In this section, you will encounter a diverse range of MCQs that cover various aspects of 8085 Microprocessor, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Computer Architecture.

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Check out the MCQs below to embark on an enriching journey through 8085 Microprocessor. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Computer Architecture.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of 8085 Microprocessor. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

8085 Microprocessor MCQs | Page 1 of 3

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Q1.
How many buses are connected as part of the 8085A microprocessor?

a.

2

b.

3

c.

5

d.

8

Discuss
Answer: (b).3
Q2.
To multiply a number by 8 in 8085 we have to use RAL instruction

a.

once

b.

twice

c.

thrice

d.

four times

Discuss
Answer: (c).thrice
Q3.
Which of the following is true?

a.

Intel 8080 was the ancestor of Intel 8085

b.

Intel 8080 was the ancestor of Intel Z 80

c.

Intel 8080 was the ancestor of both Intel 8085 and Z 80

d.

Intel 8085 was the ancestor of Intel 8085

Discuss
Answer: (c).Intel 8080 was the ancestor of both Intel 8085 and Z 80
Q4.
The register in the 8085A that is used to keep track of the memory address of the next op-code to be run in the program is the:

a.

stack pointer

b.

program counter

c.

instruction pointer

d.

accumulator

Discuss
Answer: (b).program counter
Q5.
The data bus in 8080A/8085 microprocessor is a group of

a.

eight bidirectional lines that are used to transfer 8 bits between the microprocessor and its I/O and memory

b.

sixteen bidirectional lines that are used for data transfer between the microprocessor and memory

c.

eight unidirectional lines that are used for I/O devices

d.

eight lines used to transfer data among the registers

Discuss
Answer: (a).eight bidirectional lines that are used to transfer 8 bits between the microprocessor and its I/O and memory
Q6.
In 8085, to disable the whole interrupt system (except TRAP)

a.

the DI instruction may be used

b.

the DO instruction may be used

c.

the INTERRUPT instruction may be used

d.

the El instruction may be used

Discuss
Answer: (a).the DI instruction may be used
Q7.
Exceptions to the 8085 microprocessor normal operation are called:

a.

jump instructions

b.

decoding

c.

interrupts

d.

jump instructions or interrupts

Discuss
Answer: (d).jump instructions or interrupts
Q8.

In 8085 microprocessor, which of the following interrupts has the highest priority?

a.

RST 5.5

b.

RST 7.5

c.

TRAP

d.

INTR

Discuss
Answer: (c).TRAP
Q9.
Which of the following was not a design improvement for the 8086/8088 over the 8085?

a.

Execution unit (EU)

b.

16-bit data bus

c.

Arithmetic logic unit (ALU)

d.

Bus interface unit (BIU)

Discuss
Answer: (c).Arithmetic logic unit (ALU)
Q10.
The instruction MOV M, r in 8085

a.

causes content of register r to be moved to memory location whose address is in register H, L and uses register indirect addressing mode

b.

causes the content of memory location whose address is in register H, L to move to register r and uses register indirect addressing mode

c.

causes the content of register r to be moved to memory location whose address is in register H, L and uses immediate addressing mode

d.

causes the content of memory location whose address is in register H, L to move to register r and uses immediate addressing mode

Discuss
Answer: (a).causes content of register r to be moved to memory location whose address is in register H, L and uses register indirect addressing mode
Page 1 of 3

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