8086 Microprocessor Set 4

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This set of 8086 Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on 8086 Microprocessor Set 4

Q1 | What is DEN?

direct enable

data entered

data enable

data encoding

Q2 | In 8086, Example for Non maskable interrupts are ________.

trap

rst6.5

intr

rst6.6

Q3 | In 8086 the overflow flag is set when _____________.

the sum is more than 16 bits.

signed numbers go out of their range after an arithmetic operation.

carry and sign flags are set.

subtraction

Q4 | In 8086 microprocessor the following has the highest priority among all type interrupts?

nmi

div 0

type 255

over flow

Q5 | In 8086 microprocessor one of the following statements is not true?

coprocessor is interfaced in max mode.

coprocessor is interfaced in min mode.

i /o can be interfaced in max / min mode.

supports pipelining

Q6 | Address line for TRAP is?

0023h

0024h

0033h

0099h

Q7 | Access time is faster for _________.

rom

sram

dram

eram

Q8 | The First Microprocessor was__________.

intel 4004

8080

8085

4008

Q9 | Status register is also called as ___________.

accumulator

stack

counter

flags

Q10 | Which of the following is not a basic element within the microprocessor?

microcontroller

arithmetic logic unit (alu)

control unit

Q11 | Which method bypasses the CPU for certain types of data transfer?

software interrupts

interrupt-driven i/o

polled i/o

direct memory access (dma)

Q12 | The first microprocessor had a(n)________.

1 – bit data bus

2 – bit data bus

4 – bit data bus

8 – bit data bus

Q13 | Which microprocessor has multiplexed data and address lines?

8086

80286

80386

pentium

Q14 | Which is not an operand?

variable

memory location

assembler

Q15 | A 20-bit address bus can locate ________.

1,048,576 locations

2,097,152 locations

4,194,304 locations

8,388,608 locations

Q16 | Which of the following is not an arithmetic instruction?

inc (increment)

cmp (compare)

dec (decrement)

rol (rotate left)

Q17 | During a read operation the CPU fetches ________.

a program instruction

another address

data itself

all of the above

Q18 | Which of the following is not an 8086/8088 general-purpose register?

code segment (cs)

data segment (ds)

stack segment (ss)

address segment (as)

Q19 | A 20-bit address bus allows access to a memory of capacity

1 mb

2 mb

4 mb

8 mb

Q20 | Which microprocessor accepts the program written for 8086 without any changes?

8085

8086

8087

8088

Q21 | Which group of instructions do not affect the flags?

arithmetic operations

logic operations

data transfer operations

branch operations

Q22 | The result of MOV AL, 65 is to store

store 0100 0010 in al

store 42h in al

store 40h in al

store 0100 0001 in al

Q23 | Which is not part of the execution unit (EU)?

arithmetic logic unit (alu)

clock

general registers

flags

Q24 | A microprocessor is a chip integrating all the functions of a CPU of a computer.

multiple

single

double

triple

Q25 | Microprocessor is a/an circuit that functions as the CPU of the compute

electronic

mechanic

integrating

processing

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