CS401 Solved Quiz 1

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CS401 QUIZ 1 SOLVED

Q1. In programmable interrupt controller which of the following ports is referred as interrupt mask register?

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

Correct answer: 21

Q2. ___ is the highest priority interrupt in interrupt controller

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

Correct answer: IRQ 0

3. IRET returns on the basis of and

1. CS, IP
2. DS, IP
3. CS, SS

Correct answer: CS, IP

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d) IP, SP

4. 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

5. The interrupt handler uses instruction to return back to the caller.

a) IRET

b) RETI c) INTR d) RET

Q6. Which of the following interrupt is used for Arithmetic overflow?

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

Correct answer: INT 4

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Q7. 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

Correct answer: FLAGS register, CS and then IP

Q8. Each of the bits at port _ corresponding to one of the IRQ lines.

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

Correct answer: 21

Q9. Which of the following pins of the parallel port connector are grounded? a. a) 10-18

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

Correct answer: 18-25

Q10. Which of the following interrupts plays the most significant part during step debugging of a program?

1. INT 0