Explanation

• PowerPoint is a presentation software, not an image editor.
• It is used to create slideshows, presentations, and lectures.

Explanation

CSMA/CD (Carrier Sense Multiple Access/ Collision Detection) is a media access control method

That was widely used in Early Ethernet technology/LANs

It uses carrier-sensing to defer transmissions until no other stations are transmitting.

Explanation

In a fixed-length field, the number of characters remains constant for each data entry. For instance, if a field is defined as having a fixed length of 10 characters

Then each entry in that field will have precisely 10 characters, regardless of whether all 10 characters are utilized.

Explanation

In C language, printf() function is used to print formatted output to the standard output stdout (which is generally the console screen).

The printf function is a part of the C standard library and it can allow formatting the output in numerous ways.

Explanation

A scanner is a device that captures images from:

• photographic prints
• posters
• magazine pages 
• similar sources for computer editing and display. 
  

Explanation

In the statement scanf("%d", &kilometer);, kilometer is considered a variable because:

• Declaration:

Before this statement, kilometer must have been declared as a variable

• Address of Operator:

The & operator in &kilometer is the address-of operator.

It provides the memory address of the variable kilometer to the scanf function.

• Variable Usage:

Variables are used to store data that can be modified during program execution.

Explanation

The function clrscr() is defined in the conio.h header file, which stands for "console input/output".

This header file is used in DOS-based systems and some compilers like Turbo C/C++.

It provides functions to perform console input and output operations.

Explanation

A nested loop has one loop inside of another.

These are typically used for working with two dimensions such as printing stars in rows and columns as shown below.

When a loop is nested inside another loop, the inner loop runs many times inside the outer loop.

Explanation

The MAR is a special type of register that contains the memory address of the data and instruction.

The main task of the MAR is to access instruction and data from memory in the execution phase.

Explanation

• Wolfram Alpha is not a search engine in the classical sense, it's a computational knowledge engine.
• Google, MSN, android Yahoo are traditional search engines that crawl and index web pages to provide relevant search results.