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

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

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Microprocessor
Cycle stealing mode of DMA operation involves

 Data transfer takes place between the I/O device and memory during every alternate clock cycle
 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device
 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses
 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor

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Microprocessor
The stack pointer register in a microprocessor

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

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