PAGE-3
Q-Which of the following is not a condition flag in 8086 microprocessor?
a) Trap flag
b) Auxiliary carry flag
c) Parity flag
d) Zero flag
………….
Answer: a
Explanation: 8086 microprocessor has six condition and three control flags. Trap, direction, and interrupt are the control flags. Carry, parity, auxiliary carry, zero, sign and overflow flags are the condition flags
Which of the following is not a status flag in 8086 microprocessor?
a) Overflow flag
b) Direction flag
c) Interrupt flag
d) Index flag
……….
Answer: d
Explanation: 8086 microprocessor has nine status flags. Overflow flag represents whether the result is out of scope or not. Direction flag is used in string operations and interrupt flag is used to enable the interrupts of 8086 microprocessor.
What does a microprocessor understand after decoding opcode?
a) Perform ALU operation
b) Go to memory
c) Length of the instruction and number of operations
d) Go to the output device
……….
Answer: c
Explanation: After decoding the opcode of instruction, a microprocessor understands the length of the instruction and the total number of operations to be performed.
Which of the following flag condition is used for BCD arithmetic operations in 8085 microprocessor?
a) Sign flag
b) Auxiliary carry flag
c) Parity flag
d) Zero flag
………..
Answer: b
Explanation: Among all the five flag conditions in 8085 microprocessor, the auxiliary carry flag is used internally for BCD arithmetic operations. Based on the auxiliary flag, the instruction set doesn’t contain the conditional jump operation.
Which of the following is not a property of TRAP interrupt in 8085 microprocessor?
a) It is a non-maskable interrupt
b) It is of highest priority
c) It uses edge-triggered signal
d) It is a vectored interrupt
………..
Answer: c
Explanation: TRAP interrupt in 8085 microprocessor uses both level and edge-triggered clock because it is of highest priority among all the interrupts.
Which of the following is the correct sequence of operations in a microprocessor?
a) Opcode fetch, memory read, memory write, I/O read, I/O write
b) Opcode fetch, memory write, memory read, I/O read, I/O write
c) I/O read, opcode fetch, memory read, memory write, I/O write
d) I/O read, opcode fetch, memory write, memory read, I/O write
………..
Answer: a
Explanation: Initially, the opcode is fetched from memory, then memory read and write operations are performed followed by I/O read and I/O write operations.
In 8085 microprocessor, how many opcodes are present?
a) 246
b) 278
c) 250
d) 256
…….
Answer: a
Explanation: 8085 microprocessor is an 8-bit microprocessor. So, maximum 28 = 256 opcodes are possible. But it consists of only 246 opcodes.
Q-What is the word length of the Intel Pentium-II microprocessor?
a) 8-bit
b) 32-bit
c) 64-bit
d) 16-bit
………..
Answer: c
Explanation: The Intel Pentium-II microprocessor is a 64-bit microprocessor. It was introduced in 1997 and designed with 7.5 million transistors. Its word length is 64-bit.
Q-Which technology was used by Intel to design its first 8-bit microprocessor?
a) NMOS
b) HMOS
c) PMOS
d) TTL
……..
Answer: c
Explanation: When Intel introduced its first 8-bit microprocessor, it used PMOS technology for designing because this technology was slow but simple.
next page//