Microprocessor
PUSH B instruction in 8085 microprocessor causes

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

ANSWER DOWNLOAD EXAMIANS APP

Microprocessor
Assertion(A): Ready signal of microprocessor is used to detect whether a peripheral is ready for the data transfer or not. Reason(R): In the microprocessor during data transfer operations, the wait states are added by forcing the ready signal low.

 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.

ANSWER DOWNLOAD EXAMIANS APP

Microprocessor
Cycle stealing mode of DMA operation involves

 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses
 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
 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Microprocessor