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8051 Microcontrollers & Embedded Systems MCQs

1. What is the primary function of a microcontroller in an embedded system?
a) Manage power supply
b) Process and control data
c) Transmit wireless signals
d) Display graphical user interface

Answer: b) Process and control data
Explanation: Microcontrollers in embedded systems are designed to handle data processing and control tasks, such as monitoring sensors, executing algorithms, and controlling hardware peripherals.

2. Which component of the 8051 microcontroller is responsible for executing instructions stored in memory?
a) ALU (Arithmetic Logic Unit)
b) Program Counter (PC)
c) Timer/Counter
d) Stack Pointer (SP)

Answer: b) Program Counter (PC)
Explanation: The Program Counter in the 8051 microcontroller holds the address of the next instruction to be executed, thereby controlling the program flow.

3. How many I/O pins does the 8051 microcontroller typically have?
a) 16
b) 32
c) 64
d) 128

Answer: a) 16
Explanation: The 8051 microcontroller typically has 16 I/O pins, which can be configured as either input or output to interface with external devices.

4. Which of the following is NOT a common addressing mode in the 8051 microcontroller?
a) Direct addressing mode
b) Indirect addressing mode
c) Relative addressing mode
d) Absolute addressing mode

Answer: d) Absolute addressing mode
Explanation: The 8051 microcontroller supports direct, indirect, and relative addressing modes, but not absolute addressing mode.

5. What is the purpose of interrupts in microcontroller-based systems?
a) To pause the execution of the main program
b) To reset the microcontroller
c) To increase power consumption
d) To improve program efficiency

Answer: a) To pause the execution of the main program
Explanation: Interrupts allow the microcontroller to temporarily suspend its current operation and respond to a specific event or condition, such as a signal from a sensor or a timer overflow.

6. Which register is used to configure interrupt settings in the 8051 microcontroller?
a) SP (Stack Pointer)
b) PSW (Program Status Word)
c) PCON (Power Control)
d) IE (Interrupt Enable)

Answer: d) IE (Interrupt Enable)
Explanation: The IE register in the 8051 microcontroller is used to enable or disable different interrupt sources and set their priority levels.

7. In the 8051 microcontroller, what is the function of the P0 port?
a) Timer/Counter control
b) Serial communication
c) External memory interfacing
d) General-purpose I/O

Answer: d) General-purpose I/O
Explanation: The P0 port in the 8051 microcontroller is a general-purpose I/O port that can be configured to interface with external devices or sensors.

8. Which of the following is NOT a commonly used embedded system application of microcontrollers?
a) Home automation
b) Automotive control systems
c) Video game consoles
d) Medical devices

Answer: c) Video game consoles
Explanation: While microcontrollers are used in various embedded systems applications, they are not typically used in standalone video game consoles, which often require more powerful processors.

9. Which instruction set is used by the 8051 microcontroller?
a) CISC (Complex Instruction Set Computing)
b) RISC (Reduced Instruction Set Computing)
c) ARM (Advanced RISC Machine)
d) MIPS (Microprocessor without Interlocked Pipeline Stages)

Answer: a) CISC (Complex Instruction Set Computing)
Explanation: The 8051 microcontroller uses a CISC instruction set architecture, which includes a wide range of instructions to perform various tasks.

10. How are microcontrollers beneficial in embedded systems compared to traditional microprocessors?
a) Lower cost and power consumption
b) Higher processing speed
c) Greater flexibility in programming
d) Larger memory capacity

Answer: a) Lower cost and power consumption
Explanation: Microcontrollers are often more cost-effective and consume less power compared to traditional microprocessors, making them suitable for embedded systems where cost and energy efficiency are critical considerations.

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