Microprocessor
PUSH B instruction in 8085 microprocessor causes

 the contents of registers B & C to be transferred in the stack and and the registers get cleared
 registers B & C to be cleared
 the contents of register B only to be copied in the stack
 the contents of register B & C to be copied in the stack

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Microprocessor
In an 8085 microprocessor based system, the contents of SP are 2000H. POP H instruction will transfer the contents of memory location

 2001H and 2002H to H and L registers respectively
 2000H and 1FFFH to H and L registers respectively
 2001H and 2000H to H and L registers respectively
 2000H and 1999H to H and L registers respectively

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Microprocessor
HLDA signal in 8085 performs the following operation:

 Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle.
 Indicates that another master is requesting the use of the address and data buses.
 Hold the data in the accumulator until the microprocessor is turned OFF.
 Indicates that the CPU has not received the HOLD request.

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