8085 Architecture
1.

 8085 microprocessor is an 8-bit microprocessor designed by?
A.  

IBM

 B.  

Dell

 C.  

Intel

 D.  

VAX
2.

 In 8085, 16-bit address bus, which can address upto?
A.  

16KB

 B.  

32KB

 C.  

64KB

 D.  

128KB
3.

There are _______ general purpose registers in 8085 processor
A.  

5

 B.  

6

 C.  

7

 D.  

8
4.

Flag register is an 8-bit register having __________ 1-bit flip-flops.
A.  

3

 B.  

4

 C.  

5

 D.  

6
5.

What is true about Program counter?
A.  

It is an 8-bit register, which holds the temporary data of arithmetic and logical operations.

 B.  

When an instruction is fetched from memory then it is stored in the program counter

 C.  

It provides timing and control signal to the microprocessor

 D.  

It is a 16-bit register used to store the memory address location of the next instruction to be executed.
6.

This signal indicates that another master is requesting the use of the address and data buses.
A.  

READY

 B.  

HOLD

 C.  

HLDA

 D.  

INTA
7.

This signal is used as the system clock for devices connected with the microprocessor.
A.  

X1, X2

 B.  

CLK OUT

 C.  

CLK IN

 D.  

IO/M
8.

 Which of the following is true about Control and status signals?
A.  

These signals are used to identify the nature of operation.

 B.  

There are 3 control signal and 3 status signals.

 C.  

Three status signals are IO/M, S0 & S1.

 D.  

All of the above
9.

MVI K, 20F is an example of?
A.  

Immediate addressing mode

 B.  

Register addressing mode

 C.  

Direct addressing mode

 D.  

Indirect addressing mode
10.

The clock frequency of an 8085 microprocessor is 5 MHz. If the time required to execute an instruction is 1.4 μs, then the number of T-states needed for executing the instruction is
A.  

1

 B.  

6

 C.  

7

 D.  

4