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MOCK TEST on 8051 Microcontroller – series -2


This mock test contains 50 questions.

Free mock test on 8051 microcontroller. Check your skills and get your result after completing test.

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Mock test on 8051 Microcontroller – Series-2

This test contains 8051 microcontroller questions based on asked in previous year exam. This exam contains 50 questions.

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1 / 50

What is the order decided by a processor or the CPU of a controller to execute an instruction?

2 / 50

After RETI instruction is executed then the pointer will move to which location in the program?

3 / 50

The upper 128 bytes of an internal data memory from 80H through FFH usually represent _______

4 / 50

A microcontroller at-least should consist of

5 / 50

What is the meaning of the instruction MOV A,05H?

6 / 50

Which of the following comes under the indexed addressing mode?

7 / 50

Register that is used to holds the memory address of the next instruction to be executed is

8 / 50

For writing commands on an LCD, RS bit is

9 / 50

When an interrupt is enabled, then where does the pointer moves immediately after this interrupt has occurred?

10 / 50

 Which is not the feature of 16-bit microcontroller?

11 / 50

Which pin of the LCD is used for adjusting its contrast?

12 / 50

Which operator is the most important while assigning any instruction as register indirect instruction?

13 / 50

Are PUSH and POP instructions are a type of CALL instructions?

14 / 50

Which of the following is the bit addressing range of addressable individual bits over the on-chip RAM?

15 / 50

What is the file extension is used to load in a microcontroller to execute an instruction?

16 / 50

Which operations are performed by the bit manipulating instructions of Boolean processor?

17 / 50

AT89C2051 has RAM of

18 / 50

 Why microcontrollers are not called general purpose computers?

19 / 50

 Why is it not necessary to specify the baud rate to be equal to the number of bits per second?

20 / 50

Which of the following best describes the use of framing in asynchronous means of communication?

21 / 50

What is internal RAM memory of 8051 microprocessor?

22 / 50

 What is the frequency of the clock that is being used as the clock source for the timer?

23 / 50

 29 How many bytes of bit addressable memory is present in 8051 based microcontrollers?

24 / 50

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

25 / 50

 Which of the following is the default value of stack once after the system undergoes the reset condition?

26 / 50

If we say microcontroller is 8-bit then here 8-bit denotes size of

27 / 50

At what PIN number, there is EA pin which stands for External Access input?

28 / 50

If we push data onto the stack then the stack pointer

29 / 50

Which bit of the IE register is used to enable TxD/RxD interrupt?

30 / 50

How many timers/counter 8051 16-bit microprocessor have?

31 / 50

Which special function register play a vital role in the timer/counter mode selection process by allocating the bits in it?

32 / 50

Which control signal/s is/are generated by timing and control unit of 8051 microcontroller in order to access the off-chip devices apart from the internal timings?

33 / 50

 What is the time taken by one machine cycle if crystal frequency is 20MHz?

34 / 50

How does the microcontroller communicate with the external peripherals / memory?

35 / 50

Which of the following commands are used for addressing the off-chip data and associated codes respectively by data pointer?

36 / 50

How are the status of the carry, auxiliary carry and parity flag affected if the write instruction


ADD A,#64H

37 / 50

In 8 bit signed number operations, OV flag is set to 1 if:

38 / 50

Auto reload mode is allowed in which mode of the timer?

39 / 50

Which of the following signal control the flow of data?

40 / 50

……….. signal control the flow of data

41 / 50

What is the most appropriate criterion for choosing the right microcontroller of our choice?

42 / 50

MOV A, @ R1 will:

43 / 50

What is the difference between UART and USART communication?

44 / 50

Which location specify the storage/loading of vector address during the interrupt generation?

45 / 50

When we add two numbers the destination address must always be.

46 / 50

How are the performance and the computer capability affected by increasing its internal bus width?

47 / 50

Which pin of the external hardware is said to exhibit INT0 interrupt?

48 / 50

JZ, JNZ, instructions checked content of _______ register

49 / 50

Unlike microprocessors, microcontrollers make use of batteries because they have

50 / 50

Which of the ports act as the 16 bit address lines for transferring data through it?

Your score is

The average score is 77%


This test contains 8051 microcontroller questions based on asked in previous year competitive exam.


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