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
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- What is the size of the accumulator (A register) in 8051?
A) 4-bit B) 8-bit C) 16-bit D) 32-bit Answer: B) 8-bit
- Which register is known as the B register in 8051?
A) Special Function Register B) General-purpose register C) Program counter D) Stack pointer Answer: A) Special Function Register
- How many general-purpose registers are available in each register bank?
A) 4 B) 8 C) 16 D) 32 Answer: B) 8
- How many register banks are present in the 8051?
A) 2 B) 3 C) 4 D) 8 Answer: C) 4
- Which register is used as the stack pointer?
A) SP B) DPTR C) PC D) PSW Answer: A) SP
- What is the size of the Stack Pointer (SP) in 8051?
A) 4-bit B) 8-bit C) 16-bit D) 32-bit Answer: B) 8-bit
- Which register contains the carry flag?
A) ACC B) B C) PSW D) SP Answer: C) PSW
- PSW stands for:
A) Program Status Word B) Program System Word C) Processor Status Word D) Peripheral Status Word Answer: A) Program Status Word
- Which flag indicates an overflow in signed arithmetic?
A) Carry flag B) Overflow flag C) Parity flag D) Auxiliary carry flag Answer: B) Overflow flag
- Which instruction is used to move data from one location to another?
A) ADD B) MOV C) SUBB D) MUL Answer: B) MOV
- Which instruction performs addition with the accumulator?
A) ADD B) MOV C) INC D) CLR Answer: A) ADD
- Which instruction performs subtraction with borrow?
A) SUB B) SUBB C) DEC D) CJNE Answer: B) SUBB
- Which instruction increments a register by one?
A) DEC B) INC C) ADD D) INCR Answer: B) INC
- Which instruction decrements a register by one?
A) DEC B) INC C) SUBB D) DJNZ Answer: A) DEC
- Which instruction is used to clear the accumulator?
A) SETB A B) CLR A C) MOV A, FFH D) RESET A Answer: B) CLR A
- Which instruction rotates the accumulator left?
A) RRC A B) RL A C) RR A D) RLC A Answer: B) RL A
- Which instruction rotates the accumulator right through carry?
A) RR A B) RL A C) RRC A D) RLC A Answer: C) RRC A
- Which instruction is used to multiply two 8-bit numbers?
A) MUL AB B) MULT AB C) ADD AB D) DIV AB Answer: A) MUL AB
- Which instruction is used to divide the accumulator by the B register?
A) DIV AB B) DIV BA C) MOD AB D) SUBB AB Answer: A) DIV AB
- Which instruction is used for a bitwise AND operation?
A) ORL B) XRL C) ANL D) AND Answer: C) ANL
- Which instruction is used for a bitwise OR operation?
A) ANL B) ORL C) XRL D) OR Answer: B) ORL
- Which instruction performs an exclusive-OR operation?
A) XRL B) XOR C) ORL D) ANL Answer: A) XRL
- Which instruction is commonly used to create a delay loop by decrementing a register?
A) DJNZ B) CJNE C) JMP D) NOP Answer: A) DJNZ
- Which instruction does nothing and consumes instruction execution time?
A) NOP B) CLR C) WAIT D) IDLE Answer: A) NOP
- What is the typical crystal oscillator frequency commonly associated with the classic 8051?
A) 1 MHz B) 4 MHz C) 11.0592 MHz D) 50 MHz Answer: C) 11.0592 MHz
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8051 microcontroller trainer kit
8051 microcontroller trainer kit
Books for Microcontroller 8051
- KSEB Sub Engineer and AE Books
- The 8051 Micro controller 3rd Edition,by Kenneth Ayala
- The 8051 Microcontrollers & Embedded Systems, by Mazidi
- 8051 MICROCONTROLLER AND APPLICATIONS FOR BSC
- Microcontroller & Embedded Systems for BE
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- 25 MCQs on 8051 Microcontroller