IT &computer MCQ section 1 MCQ Questions & Answers Detailed Explanation

Answer: (b)

The byte is a unit of digital information in computing and telecommunications that most commonly consists of eight bits. Historically, a byte was the number of bits used to encode a single character of text in a computer.

Answer: (a)

A firewall is a computer appliance or router that sits between the trusted and untrusted systems. It enables a computer to be connected safely to an untrustworthy network.

It is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules.

Answer: (a)

Microwaves are radio waves, while the rest three are some form of cables.

Coaxial cable: a kind of copper cable used between the community antenna and user homes and businesses;

Optical fiber: a flexible, transparent fibre made of glass or plastic; and

Twisted pair cable: a type of wiring in which two conductors of a single circuit are twisted together for the purposes of cancelling out electromagnetic interference (EMI) from external sources.

Answer: (b)

Charles Babbage, was an English mathematician, philosopher, inventor and mechanical engineer who originated the concept of a programmable computer. Considered as “father of the computer”, Babbage is credited with inventing the first mechanical computer that eventually led to more complex designs.

Answer: (a)

The short-term scheduler is also known as the CPU scheduler. Its main objective is to increase system performance in accordance with the chosen set of criteria.

It decides which of the ready, in-memory processes is to be executed after a clock interrupt, an I/O interrupt, an operating system call or another form of signal.

Thus, the short-term scheduler makes scheduling decisions much more frequently than the long-term or mid-term schedulers.

Answer: (a)

A moderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235.

Commonly used moderators include regular (light) water (roughly 75% of the world's reactors), solid graphite (20% of reactors) and heavy water (5% of reactors).