Microprocessor
In 8085 name/names of the 16 bit registers is/are

 stack pointer.
 none of these.
 both A and B.
 program counter.

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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.

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

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