Microprocessor
The 8085 microprocessor enters into bus idle machine cycle whenever

 INTR interrupt is recognized
 DAD RP instruction is executed
 RST 7.5 is recognized
None of these

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Microprocessor
Program counter in a digital computer

 Counts the number of times the loops are executed.
 Points the memory address of the next instruction to be fetched.
 Counts the numbers of programs run in the machine.
 Counts the number of times a subroutine is called.

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Microprocessor
Cycle stealing mode of DMA operation involves

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

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