Samacheer Kalvi 12th Computer Applications Book Back Answers: All 18 Chapters

Class 12 Computer Applications looks like a lot of material at first: eighteen chapters that run from multimedia and desktop publishing through PHP programming, networking and e-commerce. The good news is that the book back questions are very direct. Most of them test a definition, an expansion, a keyboard shortcut or a function name, which means careful revision turns into marks quickly.

This page brings together the book back answers for every chapter, each with a short explanation of why the correct option is right.

All 18 chapters of 12th Computer Applications

Unit	Chapter	Area
1	Multimedia	Multimedia and DTP
2	An Introduction to Adobe PageMaker	Multimedia and DTP
3	Introduction to Database Management System	Database
4	PHP: Hypertext Preprocessor	PHP
5	Functions and Arrays in PHP	PHP
6	Conditional Statements in PHP	PHP
7	Loops in PHP	PHP
8	Forms and Files	PHP
9	Connecting PHP and MySQL	PHP
10	Introduction to Computer Networks	Networking
11	Network Examples and Protocols	Networking
12	Domain Name System (DNS)	Networking
13	Network Cabling	Networking
14	Open Source Concepts	Networking
15	E-Commerce	E-Commerce
16	Electronic Payment Systems	E-Commerce
17	E-Commerce Security Systems	E-Commerce
18	Electronic Data Interchange (EDI)	E-Commerce

Every chapter also has additional MCQs, study notes and a timed practice test on the 12th Computer Applications chapter list.

Read the syllabus as five blocks, not eighteen chapters

The chapters group naturally, and revising block by block makes the connections obvious:

• Multimedia and DTP (Units 1–2). File formats and PageMaker tools. Pure recall: raster versus vector, what JPEG expands to, which menu holds Place, which shortcut closes a document.
• Database (Unit 3). ER diagrams, weak entity sets, tuples as rows, and MySQL as a relational DBMS.
• PHP (Units 4–9). The largest block. Syntax, data types, arrays, conditions, loops, forms, files and the mysqli functions. Six chapters build on each other, so learn them in order.
• Networking (Units 10–14). Protocols, IP addressing, DNS, cables and connectors, and open source simulation tools.
• E-Commerce (Units 15–18). Business models, payment systems, security protocols and EDI standards.

How to use book back answers properly

1. Answer first, check second. Cover the answer and commit to an option. Recognising the right answer is far easier than recalling it, and the exam asks you to recall.
2. Learn the wrong options too. A question on raster formats lists vector formats as distractors. Knowing that EPS, CDR and SVG are vector formats answers the next question as well.
3. Keep a one-page expansions list. PHP, DTP, JPEG, RTF, AIFF, URL, UTP, RFID, ECS, PGP, SET, EDI, EDIFACT, TDCC. Expansion questions are the quickest marks in this paper.
4. Redo mistakes after three days. Only the ones you got wrong.

Common traps in 12th Computer Applications MCQs

• Entry-check versus exit-check loops. for and while check the condition before the body runs; do...while runs the body first. Questions ask this directly.
• Equal versus identical. In PHP, == compares values while ===, the identical operator, also requires the same type.
• Case sensitivity in PHP. Variable names are case-sensitive; keywords and function names are not.
• Intranet versus extranet. An intranet is restricted to members of the organisation. An extranet securely shares information with outside suppliers, vendors and partners.
• Connector names. RJ45 is the Ethernet connector with eight pins. RJ21 is the one called the champ connector.
• "Not" questions. "Which of the following is not a loop statement" has if...else as its answer. Underline the word "not" before reading the options.

Where to practise

Once a chapter's answers make sense, take its timed practice test on the Class 12 Computer Applications section. For the PHP block, our PHP functions and syntax guide collects every function and rule the book back questions test in one place.