21. When is the register set gets expanded in 80286?
A. In real mode
B. In expanded mode
C. In protected mode
D. Interrupt mode
Answer: C
In protected mode, two additional register arises which is called the index register and base pointer register which helps in expanding the register.
22. Which are the two registers available in the protected mode of 80286?
A. General and segmented
B. General and pointer
C. Index and base pointer
D. Index and segmented
Answer: C
In the protected mode of 80286, two additional register arises which is called the index register and base pointer register.
23. What kind of support does 80286 access in protected mode?
A. Real mode
B. Address access
C. Data access
D. Virtual memory
Answer: D
In the protected mode of 80286, two additional register arises which is called the index register and base pointer register. This allows the 80286 to support a virtual memory scheme.
24. Which of the following processor possess memory management?
A. 8086
B. 8088
C. 80286
D. 8051
Answer: C
Because of the efficient paging mechanism, 80286 is one of the processors which allows the memory management unit. 8086 and 8088 do not allow a paging mechanism. 8051 is a microcontroller that has an in-built memory and does not possess a paging mechanism.
25. What is the size of the address bus in 80286?
A. 20
B. 24
C. 16
D. 32
Answer: B
The size of the address bus in 80286 is 24 bits and 20 bits in 8088 and 8086.
26. Which is the interrupt vector in 80286 that functions for stack fault?
A. 11
B. 12
C. 14
D. 16
Answer: B
12 is the interrupt vector indicating stack fault. It will be different for a different microprocessor.
27. Which is the interrupt vector that functions as an invalid opcode?
A. 9
B. 8
C. 7
D. 6
Answer: D
6 is the interrupt vector indicating an invalid opcode. It will be different for a different microprocessor.
28. Which of the following possess the same set of instructions?
A. 8088 and 80286
B. 8086 and 80286
C. 8051 and 8088
D. 8051 and 8086
Answer: B
80286 is based on the architecture of 8086. So both the processors have the same set of instructions with slight variations.
29. Which of the following is a coprocessor of 80386?
A. 80387
B. 8087
C. 8089
D. 8088
Answer: A
80386 has 80387 as a floating-point arithmetic coprocessor that can perform various floating-point calculations.
30. Name the processor which helps in floating-point calculations.
A. microprocessor
B. microcontroller
C. coprocessor
D. controller
Answer: C
The coprocessor can perform signal processing, floating-point arithmetics, encryption, etc.
