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

Answer: (d)

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

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: (c)

The World Wide Web (abbreviated as WWW or W3, commonly known as the Web), is a system of interlinked hypertext documents accessed via the Internet.

Using concepts from his earlier hypertext systems like ENQUIRE, British engineer, computer scientist and at that time employee of CERN, Sir Tim Berners-Lee, now Director of the World Wide Web Consortium (W3C), wrote a proposal in March 1989 for what would eventually become the World Wide Web.

Answer: (a)

The size of a display is usually by monitor manufacturers given by the diagonal, i.e. the distance between two opposite screen corners. This method of measurement is inherited from the method used for the first generation of CRT television when picture tubes with circular faces were in common use.

Being circular, only their diameter was needed to describe their size. Since these circular tubes were used to display rectangular images, the diagonal measurement of the rectangle was equivalent to the diameter of the tube’s face.

Answer: (b)

In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer. Devices that operate at the physical layer include repeaters, hubs, network interface cards (NICs), cables and connectors. Repeaters are used to regenerate electrical signals that have attenuated (i.e., weakened) as a result of distance.

Answer: (b)

The computer mouse as we know it today was invented and developed by Douglas Englebart during the 1960’s. While creating the mouse, Douglas was working at the Stanford Research Institute and originally referred to the mouse as a “X-Y Position Indicator for a Display System.” This mouse was first used with the Xerox Alto computer system in 1973.