CS401 Final Term MCQs and Short Notes

Final Term Short Notes + MCQS

1. Which One of the following instruction is used to return from an interrupts service routine? (page 104)

Iret

2.

The fist parallel port LPTI has ports designed from · to · (page 125) 378,37A

3.

INT 16

is used for exporting keyboard services. (page 108)

4.

Which of the following in the priority of interrupt Request (IRQ) 0? (Page 114)

Highest

5.

Each of Bits of Points

corresponds to one of the interrupts Request (IRQ) lines. (page 115)

6.

If the

flag is set, then after every instruction a type 1 interrupt will be generated automatically. (page 133)

Trap OR Interrupt

7.

is/are the point number(s) for parallel point. (page 115)

8.

Which of the following stand for TSR? (page 121)

Terminate and Stay Resident 9. Which of the following is correct regarding the input frequency of programmable interval timer (PIT)? (Page 122)

It is Fixed

10.

At the end of servicing an interrupt

signal is used to inform the programmable interrupt controller (PIC) about it. (page 114) EOI

Q11. In programmable interrupt controller which of the following ports is referred as interrupt mask register?

1. 19
2. 20
3. 21
4. 22

12. is the highest priority interrupt in interrupt controller a. IRQ 0 b. IRQ 1 c. IRQ 2 d. IRQ 3

13. IRET returns on the basis of and _ a. CS, IP b. DS, IP c. CS, SS d. IP, SP
14. If is set, the after every instruction a type 1 interrupt will be automatically generated. a. Parity flag b. Trap flag c. Carry flag d. Overflow flag
15. The interrupt handler uses instruction to return back to the caller. a. IRET b. RETI c. INTR d. RET

Q16. Which of the following interrupt is used for Arithmetic overflow?

1. INT 1
2. INT 2
3. INT 3
4. INT 4

Q17. During the execution of INT instruction , some contents are pushed on to the stack , the order of pushing then is

1. CS , IP and then FLAGS register
2. IP,CS and then FLAGS register
3. FLAGS register, CS and then IP
4. FLAGS register, IP and the CS
5. Each of the bits at port corresponding to one of the IRQ lines.

1. 18
2. 19
3. 20
4. 21

Q19. Which of the following pins of the parallel port connector are grounded?

1. 10-18
2. 18-25
3. 25-32
4. 32-39

Q20. Which of the following interrupts plays the most significant part during step debugging of a program?

1. INT 0
2. INT 1
3. INT 2
4. INT 3

Q21. Which of the following IRQs is connected to serial port COM 2?

1. IRQ 0
2. IRQ 1
3. IRQ 2
4. IRQ 3

Q22. Which of the following IRQs is connected to serial port COM 1?

1. IRQ 4
2. IRQ 5
3. IRQ 6
4. IRQ 7

Q23. Which of the following IRQs is used by the parallel port?

1. IRQ 4
2. IRQ 5
3. IRQ 6
4. IRQ 7

Q24. In programmable interrupt controller which of the following ports is used to selectively enabling or disabling interrupts?

1. 19
2. 20
3. 21
4. 22

Q25. The space where all the registers of task are stored is called

1. Control block
2. Process control block
3. Stack
4. Memory

Q26. Which of the following is the destination register in IN instruction?

1. AL or AX
2. BL or BX
3. CL or CX
4. DL or DX

Q27. Which of the following interrupts is used for saving and restoring the registers

1. INT 6
2. INT 7
3. INT 8
4. INT 0

Q28. In multitasking environment, which of the following structure is used to maintain the ordering of active PCBs?

1. Array
2. Register
3. Linked List
4. Stack

Q29. In multitasking which of the following interrupts is used as scheduler during context switching?

1. INT 21
2. INT 16
3. INT 13
4. INT 8

Q30. Which of the following are required for thread entry?

1. CS and DS
2. CS and IP
3. IP and general purpose registers
4. SS and SP