Microprocessor
Assertion(A): Monostablemultivibrators (IC74121) are used in a microprocessor based system for frequency measurement. Reason(R): Microprocessor counts the number of interrupt signals/second or within a specified interval through ISR.

 Both A & R are true and R is the correct explanation of A.
 A is false but R is true.
 A is true but R is false.
 Both A & R are true but R is not the correct explanation of A.

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Microprocessor
Which one of the following is not correct?

 Bus is a group of wires
 An interrupt signal is required at the start of every program
 An instruction is a set of bits that defines a computer operation
 Bootstrap is a technique or device for loading first instruction

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of instructions being executing on the microprocessor
 holds the address of the top of the stack
 keeps the address of the next instruction to be fetched
 counts the number of programs being executing on the microprocessor

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