SUB:- Microcontroller and its application (4th semester : Namaskar dosto aaj is article me ham apke lia most important questions (MCQ) uplabadh Kara rahe Jo apke exame ke liye behad labhdayk sabhit hoga 

microcontroller questions and answers electronics engineering 

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What is internal RAM memory of 8051microcontroller ?

a) 32 bytes
b) 64 bytes
c) 128 bytes
d) 256 bytes

The first machine cycle of an instruction is always

a) A Memory read Cycle
b) A fetch cycle
c) An I/O read cycle
d) A memory write cycle

In 8085 microprocessor the value of the most significant bit of the result
following instruction the execution of any arithmetic or Boolean instruction is
store in

a) Carry status flag
b) Auxiliary carry status flag
c) Sign status flag
d) Zero status flag

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If 8085 microprocessor add 87H and 79H, then

a) Both carry and zero flag will be set to 0
b) Both carry and zero flag will be set to 1
c) carry flag will be set to 0 and Zero flag to 1
d) carry flag will be set to 1 and Zero flag to 0

Which one of the following interrupt is both level and edge sensitive

a) RST 7.5
b) RST 5.5
c) TRAP
d) INTR

Consider the following 8085 interrupt:
1. RST 7.5 2. INTR
3. RST 6 4. TRAP
5. RST 0
The software interrupt is

a) 1 and 3
b) 2 and 5
c) 3 and 5
d) 1,2,3,4 and 5

In a microprocessor, the register which hold address of next instruction to
be fetch is

a) Accumulator
b) Program counter
c) Stack pointer
d) Instruction register.

What is the address space of 8086 microprocessor

a) 1MB
b) 256KB
c) 64KB
d) 1 GB

BIU and EU stand for
a) Bus interface unit and Exchange Unit
b) Bus interface unit and Execution Unit
c) Bess interface unit and Execute Unit
d) Both a & b

In 8086 microprocessor, accumulator and instruction pointer is how
may bit…………
a) 8-Bit and 8-Bit
b) 16-Bit and 8-Bit
c) 8-Bit and 16-Bit
d) 16-Bit and 16-Bit

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14. If we push data into the stack of 8051, the stack pointer
a) Increase with every push
b) Decrease with every push
c) Either Increase and decrease with every push
d) Both a & b

Number of I/O port in the 8051 microcontroller.
a) 4
b) 3
c) 5
d) 6

Which pin provide a reset option in 8051?
a) Pin 1
b) Pin 8
c) Pin 11
d) Pin 9

What is the range of SFR?
a) 80 H to FE H
b) 00 H to FF H
c) 80 H to FF H
d) 00 H to FE H

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