Interrupts Questions

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11.

The 8085 microprocessor responds to the presence of an interrupt ___________

A

As soon as the trap pin becomes

B

By checking the trap pin for

C

By checking the trap pin for

D

By checking the trap pin for

Correct Answer: C

The 8085 microprocessor are designed to complete the execution of the current instruction and then to service the interrupts.

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12.

CPU as two modes privileged and non-privileged. In order to change the mode from privileged to non-privileged.

A

A hardware interrupt is needed

B

A software interrupt is needed

C

Either hardware or software interrupt is needed

D

A non-privileged instruction (which does not generate an interrupt)is needed

Correct Answer: B

A software interrupt by some program which needs some CPU service, at that time the two modes can be interchanged.

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13.

Which interrupt is unmaskable?

A

RST 5.5

B

RST 7.5

C

TRAP

D

Both RST 5.5 and 7.5

Correct Answer: C

The trap is a non-maskable interrupt as it deals with the ongoing process in the processor. The trap is initiated by the process being executed due to lack of data required for its completion. Hence trap is unmaskable.

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14.

From amongst the following given scenarios determine the right one to justify interrupt mode of data transfer.i) Bulk transfer of several kilo-byte
ii) Moderately large data transfer of more than 1kb
iii) Short events like mouse action
iv) Keyboard inputs

A

i and ii

B

ii

C

i, ii and iv

D

iv

Correct Answer: D

None

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15.

How can the processor ignore other interrupts when it is servicing one ___________

A

By turning off the interrupt request line

B

By disabling the devices from sending the interrupts

C

BY using edge-triggered request lines

D

All of the mentioned

Correct Answer: D

None

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16.

The main job of the interrupt system is to identify the ______ of the interrupt.

A

signal

B

device

C

source

D

peripherals

Correct Answer: C

The main job of the interrupt system is to identify the source of the interrupt.

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17.

The hardware interrupts which can be delayed when a much high priority interrupt has occurred at the same time are known as ___________.

A

Non Maskable Interrupt

B

Maskable Interrupt

C

Normal Interrupt

D

None of the above

Correct Answer: B

Maskable Interrupt : The hardware interrupts which can be delayed when a much high priority interrupt has occurred at the same time.

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18.

The interrupts that are caused by software instructions are called ______________.

A

Exception interrupts

B

Normal Interrupt

C

hardware interrupt.

D

None of the above

Correct Answer: B

Normal Interrupt : The interrupts that are caused by software instructions are called normal software interrupts.

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19.

 In Daisy Chaining Priority, the device with the highest priority is placed at the ______.

A

First Position

B

Last Position

C

Can be placed anywhere

D

Depend on device

Correct Answer: A

The device with the highest priority is placed at the first position followed by lower priority devices and the device which has lowest priority among all is placed at the last in the chain.

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20.

Which microprocessor are designed to complete the execution of the current instruction and then to service the interrupts?

A

8081

B

8082

C

8084

D

8085

Correct Answer: D

The 8085 microprocessor are designed to complete the execution of the current instruction and then to service the interrupts.

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