MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -Unit of transfer: For main memory, this is the number of bits read out of or written into memory at a time. The unit of transfer need not equal a word or an addressable unit. For external memory, data are often transferred in much larger units than a word, and these are referred to as blocks.

Detailed explanation-2: -Unit of Transfer: The measure of data is different in internal and external devices. In internal devices, it is measured as the number of electrical signals that are moving in and out of the device. In external devices, it is the number of bits moved inside and out.

Detailed explanation-3: -Data transfers from disk to memory are handled by the system bus, not by the processor. This means that the processor is available to process data during disk I/O.

Detailed explanation-4: -The transfer of new data to be saved into the memory is known as the write operation. The memory transfer in the write operation is described as the transfer of data from the memory buffer register (MBR) to the address register (AR) with the chosen word M for the memory.

Detailed explanation-5: -Computer storage and memory is often measured in megabytes (MB) and gigabytes (GB).