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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 9 of 13

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Q81.
The number of TTL inputs that can be sinked by the port 0 when a logic 0 is sent to a port line as an output port is

a.

2

b.

4

c.

6

d.

8

Discuss
Answer: (d).8
Q82.
The open drain bidirectional (input or output) port with internal pullups is

a.

Port 0

b.

Port 1

c.

Port 2

d.

Port 3

Discuss
Answer: (a).Port 0
Q83.
The port that can source or sink 4 LS TTL inputs when being used as an output port on each of its line is

a.

Port 1

b.

Port 2

c.

Port 3

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q84.
The port that will source a current of 500 micro amperes when being used as input ports is

a.

0.5 mA

b.

0.25 mA

c.

250 micro amperes

d.

500 micro amperes

Discuss
Answer: (d).500 micro amperes
Q85.
If the EA(active low) signal is grounded then the execution

a.

directly start from main memory

b.

directly start from 16 bit address in main memory

c.

directly start from 16 bit address in program memory

d.

directly start from RAM

Discuss
Answer: (c).directly start from 16 bit address in program memory
Q86.
When the port lines of a port are to be used as input lines then the value that must be written to the port address is

a.

F0H

b.

0FH

c.

FFH

d.

00H

Discuss
Answer: (c).FFH
Q87.
Port 1 lines are used during programming of

a.

external EPROM and EEPROM

b.

external ROM and RAM

c.

internal ROM and RAM

d.

internal EPROM and EEPROM

Discuss
Answer: (d).internal EPROM and EEPROM
Q88.
The configuration in which each LED receives operating current of 8 mA from power supply while the port lines sink the current on each port line is

a.

common port configuration

b.

common anode configuration

c.

common cathode configuration

d.

none of the mentioned

Discuss
Answer: (b).common anode configuration
Q89.
If EA(active low) signal =1, then the execution starts from

a.

internal EPROM

b.

flash RAM

c.

internal EPROM or flash RAM

d.

None of the mentioned

Discuss
Answer: (c).internal EPROM or flash RAM
Q90.
The pin that is grounded for interfacing external EPROM is

a.

EA(active low)

b.

PSEN(active low)

c.

OE(active low)

d.

All of the mentioned

Discuss
Answer: (a).EA(active low)
Page 9 of 13

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