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

Answer: (c)

www stands for the World Wide Web which is a system of Internet servers that support specially formatted documents. The documents are formatted in a markup language called HTML (HyperText Markup Language) that supports links to other documents, as well as graphics, audio, and video files.

Answer: (c)

A central processing unit (CPU), also known as processor, consists of two main components: Arithmetic Logic Unit (ALU), which performs arithmetic and logical operations and the Control Unit (CU), which extracts instructions from memory and decodes and executes them, calling on the ALU when necessary.ALU is a fundamental building block of CPU.

Answer: (a)

Read-only memory (ROM) is a form of data storage in computers and other electronic devices that is non-volatile. Its contents are retained even when the device is powered off. Other examples of nonvolatile memory include flash memory, ferroelectric RAM (F-RAM), hard disk drives, floppy disks, etc.

Answer: (c)

A central processing unit (CPU) is the hardware within a computer system that carries out the instructions of a computer program by performing the basic arithmetical, logical, and input/output operations of the system.

Two typical components of a CPU are the arithmetic logic unit (ALU), which performs arithmetic and logical operations, and the control unit (CU), which extracts instructions from memory and decodes and executes them, calling on the ALU when necessary.

In most computers, the shuffling of data between the CPU and RAM happens millions of times every second.

Answer: (d)

Transistor technology is the new buzzword in the computer world. Replacing silicon transistors with carbon nanotubes could make any electronic device — smartphones, laptops, tablets and supercomputers — smaller and more powerful using less energy than those built using silicon-based transistors.

Scientists at Stanford University, in September 2013, announced to have built the first functioning computer that used only carbon nanotube transistors.

Answer: (c)

A communications satellite works like a relay station: signals transmitted by the ground stations are picked up by the satellite’s receiver antennas, the signals are filtered, their frequency changed and amplified, and then routed via the transmit antennas back down to Earth.

The redirected signals are received by ground stations, also called earth stations and further processed to extract the baseband signals.