8085 Microprocessor Architecture And Programming Fundamentals Practice Tests

Question 1

A microprocessor operates at a clock frequency of 5 MHz. If one T-state is equivalent to one clock cycle, what is the time taken by the microprocessor to execute an instruction that requires 12 T-states?

Accepted Answer

A. 2.4 $\mu$s

Answer

B. 6 $\mu$s

Answer

C. 0.2 $\mu$s

Answer

D. 12 $\mu$s

Question 2

An 8085 microprocessor has a 16-bit address bus. What is the maximum memory (in KB) that the 8085 can directly address?

Accepted Answer

B. 64 KB

Answer

A. 32 KB

Answer

C. 128 KB

Answer

D. 256 KB

Question 3

The 8085 microprocessor is executing a program. The current values of the register pair HL is H = 20H and L = 50H. What memory location is being pointed to by the HL register pair?

Accepted Answer

C. 2050H

Answer

A. 5020H

Answer

B. 20H

Answer

D. 50H

Question 4

An 8085 microprocessor has a clock frequency of 3 MHz. Calculate the time period of one clock cycle (T-state) in microseconds.

Accepted Answer

0.333

Question 5

The 8085 microprocessor can directly address 128KB of memory using its 16-bit address bus.

Accepted Answer

True

Answer

False

Question 6

Which of the following are key functions of the Arithmetic Logic Unit (ALU) in a microprocessor?

Answer

A. Addition

Answer

B. Logical AND

Answer

C. Subtraction

Answer

D. Increment

Answer

E. Memory Addressing

Question 7

An 8085 microprocessor is executing an instruction that requires fetching data from memory location 2050H. If the content of the accumulator is 50H, and the instruction is STA 2050H, what will be the content of memory location 2050H after the execution of this instruction?

Accepted Answer

50H

Answer

2050H

Answer

00H

Answer

FFH

Question 8

In the 8085 microprocessor, the address bus is 16 bits wide. What is the total memory addressable by the 8085?

Accepted Answer

65536 bytes

Answer

256 bytes

Answer

1024 bytes

Answer

4096 bytes

Question 9

An 8085 microprocessor has the following instruction: MVI A, 3CH. After executing this instruction, what will be the content of the accumulator?

Accepted Answer

3CH

Answer

00H

Answer

FFH

Answer

03H

Question 10

An 8085 microprocessor is executing an instruction that requires fetching data from memory location 2050H. If the content of the BC register pair is 2050H, and the instruction is LDAX B, what will be the content of the accumulator if memory location 2050H contains the value 7AH?

Accepted Answer

7AH

Question 11

An 8085 microprocessor is executing an instruction that requires storing the content of the accumulator into memory location 3000H. If the content of the accumulator is A5H, and the instruction is STA 3000H, what will be the content of memory location 3000H after the execution of this instruction?

Accepted Answer

A5H

Answer

3000H

Answer

00H

Answer

FFH

Question 12

What will be the content of the accumulator after executing the following 8085 assembly code?

MOV A, 05H
ADI 0AH

Accepted Answer

B. 0FH

Answer

A. 05H

Answer

C. 10H

Answer

D. 15H

Question 13

Which instruction is used to decrement the content of a register in 8085?

Accepted Answer

C. DCR

Answer

A. INR

Answer

B. SUB

Answer

D. ADD

Question 14

What is the function of the 'CALL' instruction in 8085 assembly language?

Accepted Answer

A. Transfers program control to a subroutine.

Answer

B. Jumps to a specified memory location.

Answer

C. Returns from a subroutine.

Answer

D. Performs a logical AND operation.

Question 15

Write an 8085 assembly code snippet to add the contents of memory location 2050H to the accumulator.

Accepted Answer

LDA 2050H
ADD M

Question 16

The instruction 'JNC 2050H' will jump to the address 2050H if the carry flag is set.

Accepted Answer

True

Answer

False

Question 17

Which of the following are valid data transfer instructions in 8085?

Answer

A. MOV

Answer

B. LDA

Answer

C. STA

Answer

D. ADD

Answer

E. ANA

Question 18

An 8085 microprocessor executes an instruction that results in the accumulator holding the value 00H. Which flag in the flag register will be set?

Accepted Answer

A. Zero flag

Answer

B. Carry flag

Answer

C. Sign flag

Answer

D. Parity flag

Question 19

A device is transferring data to memory using DMA. The processor's clock frequency is 3 MHz, and each DMA transfer takes 10 clock cycles. Calculate the data transfer rate in bytes per second if each transfer involves 2 bytes.

Accepted Answer

600000 bytes/second

Question 20

During a DMA operation, the CPU directly controls the data transfer between the I/O device and memory.

Accepted Answer

False

Answer

True

8085 Microprocessor Architecture And Programming Fundamentals Practice Tests

Practice Tests

8085 Microprocessor Architecture and Programming Fundamentals

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