IT &computer MCQ section 5 MCQ Questions & Answers Detailed Explanation

Answer: (c)

A modem turns the digital data of a personal computer into modulated electrical signals in the voice frequency range of a telephone channel. These signals can be transmitted over telephone lines and demodulated by another modem at the receiver side to recover the digital data.

Answer: (a)

The Control Unit, considered as the “Central nervous System” of a computer, obtains the instructions from the memory, interprets them and directs the operation of the computer.

It selects, interprets and monitors the execution of the program instructions by generating the timing and control signals.

Answer: (b)

Logical operators are mainly used to control program flow. And, Or, AndAlso, OrElse, and Xor are binary operators.

Answer: (d)

Microencapsulation is one of the several technologies used in Electronic printing. It is widely used in “carbonless” carbon paper and “scratch-and-sniff” cologne and perfume advertisements in magazines.

This technology involves the usage of millions of transparent fluid-filled capsules containing microscopic particles (Chemistry By Steven Zumdahl, Susan Zumdahl, p. 488).

Answer: (d)

The period of first-generation computers (1946- 1958) is referred to as the Vacuum Tube Years. The first generation of computers was huge, slow, expensive, and often undependable.

In 1946 Presper Eckert and John Mauchly built the ENIAC electronic computer which used vacuum tubes instead of the mechanical switches of the Mark I. The ENIAC led to other vacuum tube type computers like the EDVAC (Electronic Discrete Variable Automatic Computer) and the UNIVAC I (UNIVersal Automatic Computer).

Answer: (d)

System software (or systems software) is computer software or an operating system designed to operate and control the computer hardware and to provide a platform for running application software. The term system software also includes software development tools like a compiler.