IT &computer MCQ section 3 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Data is stored on the disc as a series of microscopic indentations. A laser is shone onto the reflective surface of the disc to read the pattern of pits and lands.

Because the depth of the pits is approximately one-quarter to one-sixth of the wavelength of the laser light used to read the disc, the reflected beam's phase is shifted in relation to the incoming beam, causing destructive interference and reducing the reflected beam's intensity. This pattern of changing the intensity of the reflected beam is converted into binary data.

Answer: (d)

Impact Printers refer to a class of printers that work by banging a head or needle against an ink ribbon to make a mark on the paper. This includes dot-matrix printers, daisy-wheel printers, and line printers. In contrast, laser and ink-jet printers are nonimpact printers.

Answer: (a)

Ray Tomlinson is credited with developing the first viable e-mail program in 1971 for use on the ARPANET.

Although text messages were occasionally sent over the network, Tomlinson created the first program. it is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks.

Some early email systems required that the author and the recipient both be online at the same time, in common with instant messaging. Today’s email systems are based on a store-and-forward model.

Answer: (c)

An Intelligent terminal is A terminal with built-in processing capability, but no local disk or tape storage.

It may use a general-purpose CPU or may have specialized circuitry as part of a distributed intelligence system. Intelligent terminals include memory and a processor to perform special display operations.

Answer: (d)

Memory management provides ways to dynamically allocate portions of memory to programs at their request, and free it for reuse when no longer needed.

It enables the allocation of additional memory space or release of unwanted space at run time for optimizing the use of storage space. It provides flexibility in adding, deleting or rearranging data items at run time.

Answer: (c)

A bug in a program is an error.