1. Extensions are called top-level domains.

2. File extensions are used so that the computer's operating system or OS can recognize the file type.

3. A file extension primarily refers to a suffix added to the end of a computer file (an object containing information, data or commands) to define the file type.

1. If a company wants to include its company name and logo at the bottom of each page of the brochure, the footer is to be used.

2. Inserting a header or footer in MS Word is a simple process that can be completed in just a few steps.

- Open the document in MS Word in which you want to insert a header or footer.

- Click on the “Insert” tab at the top of the MS Word window which is to the right of the Home tab. You can also open the insert tab by pressing the MS Word shortcut key “Alt+N”.

- In the “Header & Footer” group, click the “header” or “footer” button, depending on what you want to insert into your document.

- A menu will appear with various header and footer options. Select the desired option and then click “OK”.

- Header or Footer will now be inserted into your document. You can type directly into it or add images and other content as desired. When you're finished, click outside the header or footer area to return to the document.

The following method is used to close the file of MS PowerPoint 2010.

- Click on the File tab and then click on the Close option.

- You can click on the close button appearing on the top right side of the window.

- The keyboard shortcut Ctrl + W can be used.

All are matched-

(a) Ctrl + Shift + C    (vi) For pasting

(b) Ctrl + Z                 (iv) Undo

(c) Ctrl + L                 (ii) The alignment of the text

(d) Ctrl + H                (i) To replace

1. Information is organized into horizontal and vertical columns using tables for easy reading.

2. In MS Excel 2010, the horizontal bar is located at the bottom right of the screen.

1. A computer is an electronic machine, which presents the required information or result (Output) by doing a specialized process according to a series of instructions (Program) given on the prescribed data (Input).

2. The following are the main characteristics of a computer.

(1) Speed

(2) Accuracy

(3) Economy

(4) Reliability

(5) Storage & Retrieval

To save MS-Office documents in PDF file format, you can follow the following steps-

1. Open your MS-Office document.

2. Click on the File tab.

3. Click on Save As.

4. Select PDF from the Save As Type drop-down list.

4. In the File Name box, enter a name for your document.

5. Click on Save.