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Welcome to the Microcontroller 8051 MCQs Page

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

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

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

Microcontroller 8051 MCQs | Page 13 of 13

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Q121.
The microcontroller enters into power down mode when

a.

SMOD bit of PCON is set

b.

GF1 bit of PCON is set

c.

PD bit of PCON is set

d.

GF2 bit of PCON is set

Discuss
Answer: (c).PD bit of PCON is set
Q122.
The clock signal is disabled to all parts of 8051 in

a.

normal mode

b.

idle mode

c.

power down mode

d.

addressing mode

Discuss
Answer: (c).power down mode
Q123.
During power down to save battery, the supply voltage can be reduced to a value of

a.

4 volts

b.

2 volts

c.

8 volts

d.

1 volt

Discuss
Answer: (b).2 volts
Q124.
The signal that only pulls the microcontroller(8051) out of the power down mode is

a.

CLEAR

b.

LEAVE

c.

RESET

d.

EXIT

Discuss
Answer: (c).RESET
Q125.
The state of signals in power down mode is

a.

ALE is high

b.

PSEN is low

c.

ALE and PSEN(active low) are high

d.

ALE and PSEN(active low) are low

Discuss
Answer: (d).ALE and PSEN(active low) are low
Q126.
In power down mode,

a.

Port pins maintain their logic levels

b.

SFRs maintain their logic levels

c.

Clock signal is disabled

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q127.
The SMOD bit is used to

a.

decrease the baud rate by 2

b.

increase the baud rate by 4

c.

increase the baud rate by 2

d.

triple the baud rate

Discuss
Answer: (c).increase the baud rate by 2
Page 13 of 13

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