25 MCQs on 8051 Microcontroller

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25 MCQs on 8051 Microcontroller: In this post you can practice questions on 8051 Microcontroller. You can detailed notes on Microcontrollers in other pages, click HERE.

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25 MCQs on 8051 Microcontroller

Read : Microcontroller|Types of microcontroller

  1. The 8051 microcontroller was developed by which company?

A) Motorola B) Intel C) IBM D) AMD

Answer: B) Intel

  1. What is the size of the 8051 CPU?

A) 4-bit B) 8-bit C) 16-bit D) 32-bit

Answer: B) 8-bit

  1. How much internal RAM does the standard 8051 have?

A) 64 bytes B) 128 bytes C) 256 bytes D) 512 bytes

Answer: B) 128 bytes

  1. How much internal ROM/program memory does the standard 8051 have?

A) 2 KB B) 4 KB C) 8 KB D) 16 KB

Answer: B) 4 KB

  1. How many I/O ports are available in the standard 8051?

A) 2 B) 3 C) 4 D) 5

Answer: C) 4

  1. How many pins are there in the standard 8051 IC?

A) 20 B) 28 C) 40 D) 44

Answer: C) 40

  1. Each I/O port of the 8051 contains how many pins?

A) 4 B) 8 C) 16 D) 32

Answer: B) 8

  1. Which port of the 8051 is an open-drain port?

A) Port 0 B) Port 1 C) Port 2 D) Port 3

Answer: A) Port 0

  1. Which port provides the multiplexed lower-order address and data bus?

A) Port 0 B) Port 1 C) Port 2 D) Port 3

Answer: A) Port 0

  1. Which port provides the higher-order address bus during external memory access?

A) Port 0 B) Port 1 C) Port 2 D) Port 3

Answer: C) Port 2

  1. How many timers/counters are present in the standard 8051?

A) 1 B) 2 C) 3 D) 4

Answer: B) 2

  1. The timers in the standard 8051 are:

A) Timer 0 and Timer 1 B) Timer 1 and Timer 2 C) Timer 2 and Timer 3 D) Timer 0 and Timer 2

Answer: A) Timer 0 and Timer 1

  1. How many serial ports are available in the standard 8051?

A) 0 B) 1 C) 2 D) 4 Answer: B) 1

  1. Which register is used to control the operating mode of Timer 0 and Timer 1?

A) TCON B) TMOD C) SCON D) PCON

Answer: B) TMOD

  1. Which register is used to control the serial communication of the 8051?

A) SCON B) TMOD C) TCON D) IE

Answer: A) SCON

  1. What is the function of the EA pin in the 8051?

A) External interrupt B) Enable/disable external program memory C) Reset the microcontroller D) Start the timer

Answer: B) Enable/disable external program memory

  1. Which pin is used to reset the 8051?

A) EA B) ALE C) RST D) PSEN Answer: C) RST

  1. What is the purpose of the ALE pin?

A) Address Latch Enable B) Automatic Logic Enable C) Address Logic Encoder D) Analog Latch Enable

Answer: A) Address Latch Enable

  1. PSEN stands for:

A) Program Store Enable B) Program System Enable C) Program Set Enable D) Peripheral Store Enable

Answer: A) Program Store Enable

  1. Which register contains the address of the next instruction to be executed?

A) SP B) DPTR C) PC D) ACC Answer: C) PC

  1. The 8051 has how many interrupt sources in its standard configuration?

A) 3 B) 4 C) 5 D) 8

Answer: C) 5

  1. Which register is the accumulator in the 8051?

A) B B) A C) R0 D) DPTR

Answer: B) A

  1. What is the size of the DPTR (Data Pointer) register?

A) 8-bit B) 12-bit C) 16-bit D) 32-bit

Answer: C) 16-bit

  1. What is the default stack pointer value after reset in the standard 8051?

A) 00H B) 07H C) 08H D) FFH

Answer: B) 07H

  1. Which instruction is used to transfer control to a subroutine and later return?

A) JMP and STOP B) CALL and RET C) MOV and RET D) LOOP and END

Answer: B) CALL and RET

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Books for All Competitive Exams

Books for Microcontroller 8051

  1. KSEB Sub Engineer and AE Books
  2. The 8051 Micro controller 3rd Edition,by Kenneth Ayala
  3. The 8051 Microcontrollers & Embedded Systems, by Mazidi
  4. 8051 MICROCONTROLLER AND APPLICATIONS FOR BSC
  5. Microcontroller & Embedded Systems for BE

More on Microcontrollers

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  2. 8051 ARCHITECTURE|8051 Microcontroller Architecture
  3. 8051 Microcontroller Architecture|RISC and CISC CPU Architectures|HARVARD & VON- NEUMANN CPU Architecture
  4. Microprocessor VS Microcontroller| Comparison of Microprocessor and Microcontroller|Difference between Microprocessor and Microcontroller
  5. Addressing modes of 8051 Microcontroller|8051 Addressing Modes
  6. 8051 Microcontroller Instruction Set|KSEB Sub Engineer Notes
  7. 8051 Microcontroller MCQ|8051 Questions and Answers
  8. Microcontroller|Types of microcontroller
  9. 8051 Microcontroller Notes pdf|8051 microcontroller pdf
  10. Interrupts in 8051|Interrupts in 8051 Microcontroller
  11. 25 MCQs on 8051 Microcontroller

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