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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 6 of 14

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Q51.
Which devices are specifically being used for converting serial to parallel and from parallel to serial respectively?

a.

timers

b.

counters

c.

registers

d.

serial communication

Discuss
Answer: (c).registers
Q52.
What is the difference between UART and USART communication?

a.

they are the names of the same particular thing, just the difference of A and S is there in it

b.

one uses asynchronous means of communication and the other uses synchronous means of communication

c.

one uses asynchronous means of communication and the other uses asynchronous and synchronous means of communication

d.

one uses angular means of the communication and the other uses linear means of communication

Discuss
Answer: (c).one uses asynchronous means of communication and the other uses asynchronous and synchronous means of communication
Q53.
Which of the following best describes the use of framing in asynchronous means of communication?

a.

it binds the data properly

b.

it tells us about the start and stop of the data to be transmitted or received

c.

it is used for error checking

d.

it is used for flow control

Discuss
Answer: (b).it tells us about the start and stop of the data to be transmitted or received
Q54.
Which of the following signal control the flow of data?

a.

RTS

b.

DTR

c.

Both of the mentioned

d.

None of the mentioned

Discuss
Answer: (a).RTS
Q55.
Which of the following is the logic level understood by the micro-controller/micro-processor?

a.

TTL logic level

b.

RS232 logic level

c.

None of the mentioned

d.

Both of the mentioned

Discuss
Answer: (a).TTL logic level
Q56.
What is null modem connection?

a.

no data transmission

b.

no MAX232

c.

the RxD of one is the TxD for the other

d.

no serial communication

Discuss
Answer: (c).the RxD of one is the TxD for the other
Q57.
Which of the following best states the reason that why baud rate is mentioned in serial communication?

a.

to know about the no of bits being transmitted per second

b.

to make the two devices compatible with each other, so that the transmission becomes easy and error free

c.

to use Timer 1

d.

for wasting memory

Discuss
Answer: (b).to make the two devices compatible with each other, so that the transmission becomes easy and error free
Q58.
With what frequency UART operates( where f denoted the crystal frequency )?

a.

f/12

b.

f/32

c.

f/144

d.

f/384

Discuss
Answer: (d).f/384
Q59.
What is the function of SCON register?

a.

to control SBUF and SMOD registers

b.

to program the start bit, stop bit, and data bits of framing

c.

none of the mentioned

d.

both of the mentioned

Discuss
Answer: (b).to program the start bit, stop bit, and data bits of framing
Q60.
What should be done if we want to double the baud rate?

a.

change a bit of the TMOD register

b.

change a bit of the PCON register

c.

change a bit of the SCON register

d.

change a bit of the SBUF register

Discuss
Answer: (b).change a bit of the PCON register
Page 6 of 14

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