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Welcome to the Intel 8085 Microprocessor MCQs Page

Dive deep into the fascinating world of Intel 8085 Microprocessor with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Intel 8085 Microprocessor, a crucial aspect of Microprocessor. In this section, you will encounter a diverse range of MCQs that cover various aspects of Intel 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 Microprocessor.

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

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Intel 8085 Microprocessor MCQs | Page 1 of 5

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Q1.
Consider the following registers:
1. Accumulator and flag register
2. B and C register
3. D and E register
4. H and L register
Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16-bit register?

a.

1 ,3 and 4

b.

2 ,3 and 4

c.

1, 2 and 3

d.

1, 2 and 4

Discuss
Answer: (b).2 ,3 and 4
Q2.
In 8085 microprocessor system with memory mapped I/O, which of the following is true?

a.

Devices have 8-bit address line

b.

Devices are accessed using IN and OUT instructions

c.

There can be maximum of 256 input devices and 256 output devices

d.

Arithmetic and logic operations can be directly performed with the I/O data

Discuss
Answer: (d).Arithmetic and logic operations can be directly performed with the I/O data
Q3.
In an intel 8085A microprocessor, why is READY signal used?

a.

To indicate to user that the microprocessor is working and is ready for use.

b.

To provide proper WAIT states when the microprocessor is communicating with a slow peripheral device.

c.

To slow down a fast peripheral device so as to communicate at the microprocessor’s device.

d.

None of the above.

Discuss
Answer: (b).To provide proper WAIT states when the microprocessor is communicating with a slow peripheral device.
Q4.
consider the following
I) Sign flag II) Trap flag III) Parity flag IV) Auxiliary carry flag
Which one of the above flags is/are present in 8085 microprocessor?

a.

(I) only

b.

(I) & (II)

c.

(II) & (III)

d.

(I) ,(III) & (IV)

Discuss
Answer: (d).(I) ,(III) & (IV)
Q5.
Consider the following statements:
In 8085 microprocessor, data-bus and address bus are multiplexed in order to
I)Increase the speed of microprocessor.
II)Reduce the number of pins.
III)Connect more peripheral chips.
Which of these statements is/are correct?

a.

(I) only

b.

(II) only

c.

(II) & (III)

d.

(I), (II) & (III)

Discuss
Answer: (b).(II) only
Q6.
ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of

a.

Accumulator, temporary register, arithmetic and logic circuits

b.

Accumulator, arithmetic, logic circuits and five flags

c.

Accumulator, arithmetic and logic circuits

d.

Accumulator, temporary register, arithmetic, logic circuits and five flags

Discuss
Answer: (d).Accumulator, temporary register, arithmetic, logic circuits and five flags
Q7.
In intel 8085A microprocessor ALE signal is made high to

a.

Enable the data bus to be used as low order address bus

b.

To latch data D0-D7 from data bus

c.

To disable data bus

d.

To achieve all the functions listed above

Discuss
Answer: (a).Enable the data bus to be used as low order address bus
Q8.
Which of the following statements for Intel 8085 is correct?

a.

Program Counter (PC) specifies the address of the instruction last executed

b.

PC specifies the address of the instruction being executed

c.

PC specifies the address of the instruction to be executed

d.

PC specifies the number of instructions executed so far

Discuss
Answer: (c).PC specifies the address of the instruction to be executed
Q9.
Processor status word of 8085 microprocessor has five flags. They are

a.

S, Z, AC, P, CY

b.

S, OV, AC, P, CY

c.

S, Z, OV, P, CY

d.

S, Z, AC, P, OV

Discuss
Answer: (a).S, Z, AC, P, CY
Q10.
The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?

a.

Clock cycle

b.

Memory cycle

c.

Machine cycle

d.

Instruction cycle

Discuss
Answer: (d).Instruction cycle
Page 1 of 5

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