Digital Circuit and Microprocessor MCQs

Question 1

In 8085, out of hardware interrupts given below, one particular interrupt is quite different from others. This interrupt is

Accepted Answer

RST 7.5

Answer

RST 5.5

Answer

RST 6.5

Answer

none of these

Question 2

Intel 8080A and Motorola 6800 microprocessors differ in

Accepted Answer

instruction set and operating frequency

Answer

number of address lines

Answer

number of data lines

Answer

instruction set

Question 3

As compared to 16-bit microprocessors, 8 bit microprocessors are limited in

Accepted Answer

all the above

Answer

speed

Answer

directly addressable memory

Answer

data handling capability

Question 4

WAIT states are used

Accepted Answer

to give slow devices additional time to put out valid data

Answer

to insert a deliberate delay

Answer

during I/0 operation

Answer

none of these

Question 5

Intel 8085A and 8086A differ in

Accepted Answer

all the above

Answer

number of address lines

Answer

number of data lines

Answer

operating frequency

Question 6

The advantage of using segment registers in 8086 and above microprocessors are that they

Accepted Answer

all of above

Answer

allow the memory capacity to be 1 megabyte even though the addresses associated with the individual instructions are only 16 bits wide

Answer

allow the instruction, data or stack portion of a program to be more than 64K bytes long by using more than one code, data or stack segment

Answer

facilitate the use of separate memory areas for a program, its data and the stack

Question 7

The set of commands which give directions to the assembler during the assembly process but are not translated into machine instructions are called

Accepted Answer

directives

Answer

mnemonics

Answer

identifiers

Answer

operands

Question 8

Intel 80286 microprocessor was designed to serve as the CPU in a multitasking operating systems as it has

Accepted Answer

(f) signals to interface with co-processor

Answer

8MHz operating frequency real address mode to support lower microprocessors of the same family

Answer

(e) protection and virtual memory capability

Answer

none of these

Question 9

Intel 80386 is often called logical extension of Intel 80286 because 80386 has

Accepted Answer

paging unit, which translates linear addresses to physical addresses

Answer

higher clock frequency

Answer

more number of address and data lines

Answer

all of above