MCQ Bank
Which of the following is the interrupt number for Non-Maskable Interrupt (NMI)?
- A) INT 3
- B) INT 1
- C) INT 0
- D) INT 2
In programmable interrupt controller, which of the following ports is the control port?
- A) Port 20
- B) Port 19
- C) Port 22
- D) Port 21
An End of Interrupt (EOI) signal is sent by the _____________________.
- A) programmable interrupt controller
- B) processor
- C) interrupt request
- D) interrupt handler
Which of the following is the time interval between two timer ticks?
- A) 50 ms
- B) 40 ms
- C) 55 ms
- D) 45 ms
Interrupts are __________ events.
- A) Synchronous
- B) Dependent
- C) Predictable
- D) Asynchronous
In Intel 8088, there are a total of ___________ possible interrupt vectors in an Interrupt Vector Table.
- A) 64
- B) 512
- C) 256
- D) 128
___________ is used for exporting keyboard services.
- A) INT 12
- B) INT 11
- C) INT 16
- D) INT 8
The first parallel port LPT1 has ports designated from _________ to _________.
- A) 278, 27A
- B) 378, 37A
- C) 178, 17A
- D) 478, 47A
Which of the following Interrupt Requests (IRQ) is connected to serial port COM 2?
- A) IRQ 2
- B) IRQ 1
- C) IRQ 3
- D) IRQ 0
At the end of servicing an interrupt, ______________ signal is used to inform the Programmable Interrupt Controller (PIC) about it.
- A) IOE
- B) RET n
- C) IRET
- D) EOI
The routine which executes as a result of INT instruction is called _______________.
- A) Internal System Routine
- B) Interrupt Service Routine
- C) Interrupt Vector Routine
- D) Interrupt System Routine
Which of the following interrupts is used to maintain the system time?
- A) INT 9
- B) INT 10
- C) INT 11
- D) INT 8
If the _________ flag is set, then after every instruction, a type 1 interrupt will be generated automatically.
- A) trap
- B) overflow
- C) parity
- D) carry
Which of the following formulae is used for calculating the segment address of an interrupt service routine "n"?
- A) n*4
- B) n*4+2
- C) n*2+4
- D) n*4-2
Which of the following Interrupt Requests (IRQ) is derived by the timer device?
- A) IRQ 2
- B) IRQ 1
- C) IRQ 0
- D) IRQ 3
DOS has a single entry point to access all of its services through ______________.
- A) INT 10
- B) INT 16
- C) INT 2
- D) INT 21
______________ is used in debugging along with the trap flag.
- A) INT 1
- B) INT 2
- C) INT 0
- D) INT 3
Which of the following instruction is used to return from an interrupt service routine?
- A) reti
- B) iret
- C) ret
- D) INTR
The output of Programmable Interval Timer (PIT) is connected to the _____________ line of Programmable Interrupt Controller (PIC).
- A) IRQ 1
- B) IRQ 3
- C) IRQ 2
- D) IRQ 0
Which of the following statements is correct regarding the input frequency of Programmable Interval Timer (PIT)?
- A) It depends on processor clock
- B) It is fixed
- C) It depends on hardware attached
- D) It is variable