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Welcome to the 8051 Microcontroller MCQs Page

Dive deep into the fascinating world of 8051 Microcontroller with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 8051 Microcontroller, a crucial aspect of Computer Architecture. In this section, you will encounter a diverse range of MCQs that cover various aspects of 8051 Microcontroller, 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 Computer Architecture.

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Check out the MCQs below to embark on an enriching journey through 8051 Microcontroller. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Computer Architecture.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of 8051 Microcontroller. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

8051 Microcontroller MCQs | Page 3 of 14

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Q21.
To initialise any port as an output port what value is to be given to it?

a.

0xFF

b.

0x00

c.

0x01

d.

A port is by default an output port

Discuss
Answer: (d).A port is by default an output port
Q22.
Which out of the four ports of 8051 needs a pull-up resistor for using it is as an input or an output port?

a.

PORT 0

b.

PORT 1

c.

PORT 2

d.

PORT 3

Discuss
Answer: (a).PORT 0
Q23.
Which of the ports act as the 16 bit address lines for transferring data through it?

a.

PORT 0 and PORT 1

b.

PORT 1 and PORT 2

c.

PORT 0 and PORT 2

d.

PORT 1 and PORT 3

Discuss
Answer: (c).PORT 0 and PORT 2
Q24.
Which of the following registers are not bit addressable?

a.

SCON

b.

PCON

c.

A

d.

PSW

Discuss
Answer: (b).PCON
Q25.
Which instruction is used to check the status of a single bit?

a.

MOV A,P0

b.

ADD A,#05H

c.

JNB PO.0, label

d.

CLR P0.05H

Discuss
Answer: (c).JNB PO.0, label
Q26.
Which addressing mode is used in pushing or popping any element on or from the stack?

a.

immediate

b.

direct

c.

indirect

d.

register

Discuss
Answer: (b).direct
Q27.
Which operator is the most important while assigning any instruction as register indirect instruction?

a.

$

b.

#

c.

@

d.

&

Discuss
Answer: (c).@
Q28.
What is the advantage of register indirect addressing mode?

a.

it makes use of registers R0 and R1

b.

it uses the data dynamically

c.

it makes use of operator @

d.

it is easy

Discuss
Answer: (b).it uses the data dynamically
Q29.
Which of the following comes under indexed addressing mode?

a.

MOVX A, @DPTR

b.

MOVC @A+DPTR,A

c.

MOV A,R0

d.

MOV @R0,A

Discuss
Answer: (b).MOVC @A+DPTR,A
Q30.
Is this a valid statement ?
SETB A

a.

yes

b.

no

c.

cant be determined

d.

none of the mentioned

Discuss
Answer: (b).no
Page 3 of 14

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