MCQ Bank
In Programmable Interrupt Controller (PIC), which of the following ports is used to selectively enable or disable interrupts?
- A) 20
- B) 21
- C) 22
- D) 19
Which of the following is the ACK pin in DB-25 connector?
- A) 12
- B) 11
- C) 13
- D) 10
Which of the following instructions is used to disable all interrupts during the execution of a program?
- A) sti
- B) reti
- C) cld
- D) cli
Software interrupts are called by extended ____________ call mechanism.
- A) near
- B) short
- C) jmp
- D) far
Which of the following pins of DB-25 connector are ground?
- A) 25-32
- B) 10-17
- C) 18-25
- D) 2-9
The interrupt call loads new values in CS, IP and ______________.
- A) FLAGS
- B) DS
- C) BP
- D) SS
There are ___________ forms of MOVS instruction.
- A) three
- B) two
- C) five
- D) four
Which of the following is the number of pin(s) outside the processor for generating interrupts by the external hardware?
- A) 2
- B) 4
- C) 1
- D) 3
The IDTR is a ____________ bit register similar in structure to the GDTR.
- A) 48
- B) 128
- C) 64
- D) 32
Which of the following instructions, selects the memory address space?
- A) IN
- B) MOV
- C) ADD
- D) DEC
Which of the following flags is cleared with the help of stack?
- A) Interrupt flag
- B) Zero Flag
- C) Trap flag
- D) Direction flag
There are ____ forms of MOVS instruction.
- A) Three
- B) Four
- C) One
- D) Two
Interrupts are ________________ and ________________.
- A) asynchronous, predictable
- B) synchronous, predictable
- C) asynchronous, unpredictable
- D) synchronous, unpredictable
Which of the following is the source register in OUT instruction?
- A) AL or AX
- B) BL or BX
- C) CL or CX
- D) DL or DX
Which of the following instructions is used to read a character from the keyboard port?
- A) in al, 0x60
- B) out al, 0x60
- C) in al, 0x21
- D) in al, dx
The correlation process from the interrupt number to the interrupt handler uses a table called _________.
- A) Interrupt Handling Table
- B) Interrupt Correlation Table
- C) Interrupt Calling Table
- D) Interrupt Vector Table
Every bit of port _______ corresponds to one of the Interrupt Request (IRQ) lines.
- A) 20
- B) 19
- C) 21
- D) 18
____________ is a special instruction that loads a general purpose register, and a segment register from two consecutive memory locations.
- A) MOVS
- B) CALL
- C) LES
- D) SCAS
Which of the following Interrupt Requests (IRQ) is derived by the keyboard?
- A) IRQ 0
- B) IRQ 1
- C) IRQ 3
- D) IRQ 2
Which of the following Interrupt Requests (IRQ) is used for a floppy disk drive?
- A) IRQ 5
- B) IRQ 7
- C) IRQ 6
- D) IRQ 4