IT &computer MCQ section 4 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Read-only memory (ROM) is a class of storage medium used in computers and other electronic devices. It is programmed during manufacturing process.

Answer: (a)

Passwords are often used to protect objects in the computer system, in the absence of more complete protection schemes. They can be considered a special case of either keys or capabilities. Passwords are the most common approach to authenticating a user identity.

Answer: (a)

IC, or An integrated circuit is a small wafer, usually made of silicon, that can hold anywhere from hundreds to millions of transistors, resistors, and capacitors. These extremely small electronics can perform calculations and store data using either digital or analog technology.

Answer: (a)

The period 1953-1964 is generally taken to be the period of second-generation computers.

Sometimes, 1946-1958 is supposed to be the period of first-generation computers. By 1948, the invention of the transistor greatly changed the computer's development.

The transistor replaced the large, cumbersome vacuum tube in televisions, radios and computers. As a result, the size of electronic machinery has been shrinking ever since. From 1955 onwards transistors replaced vacuum tubes in computer designs, giving rise to the "second generation" of computers.

A second generation computer, the IBM 1401, captured about one-third of the world market. IBM installed more than ten thousand 1401s between 1960 and 1964.

Answer: (d)

A CD-RW (Compact Disc-ReWritable) is a rewritable optical disc. It is readable and writable and re-writable also.

Answer: (c)

A hierarchical database model is a data model in which the data is organized into a tree-like structure. The structure allows representing information using parent/child relationships: each parent can have many children, but each child has only one parent.