Microprocessor
Assertion(A): Segment override prefix (SOP) is used when a default offset register is not used with its default base segment register but with a different base register. Reason(R): The offset registers IP and SP can never be associated with any other segment registers apart from their respective default segments.

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

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Microprocessor
Which of the following is not true during the execution of an interrupt service routine, which does not contain any EI instructions

 the microprocessor cannot be interrupted by any interrupt
 all interrupts except non-maskable interrupt are disabled
 the microprocessor can be interrupted by a non-mask able interrupt
 the microprocessor cannot be interrupted by any mask able interrupt

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Microprocessor
The stack pointer register in a microprocessor

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

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