# Relations And Functions Class 12: 100 Questions with Solutions Including MCQ

Welcome to our comprehensive guide on Relations and Functions Class 12! Are you looking for a complete collection of 100 questions with solutions, including multiple-choice questions (MCQs)? Well, you've come to the right place. In this article, we have compiled a wide range of practice questions and detailed solutions to help you master the concepts of relations and functions. Whether you're preparing for your Class 12 exams or simply want to deepen your understanding of this topic, our collection has got you covered. Our aim is to provide you with a valuable resource that not only tests your knowledge but also helps you enhance it. Each question is carefully crafted to align with the latest syllabus and exam pattern, ensuring that you have a comprehensive understanding of relations and functions. By practicing with these questions, you will not only improve your problem-solving skills but also build confidence in tackling similar questions that may appear in your exams. So, let's dive in and get started on your journey to mastering Relations and Functions Class 12!

Navigating through Class 12 maths can sometimes feel overwhelming, especially when tackling the first chapter on Relations and Functions. Understanding this chapter is crucial, not just for acing your Class 12 exams, but also for competitive exams like JEE Mains and Advanced. This topic forms the basis of many mathematical concepts that you'll encounter in higher studies. So, where should you begin? Right here, we'll guide you through some key points of Chapter 1 Class 12 maths—Relations and Functions.

Let's start by understanding the basics: what are relations and functions? In simple terms, relations establish a connection between elements in different sets. Functions, on the other hand, are a special kind of relation. When you dive into the NCERT solutions for this chapter, you'll find various examples that help clarify these definitions. Relations and Functions Class 12 NCERT solutions offer step-by-step explanations, making it easier for both students and parents to grasp the topic.

Many students often look for reliable sources for Class 12 Maths Relations and Functions notes. Having well-organized notes can aid in quick revisions and can serve as a handy guide for all those last-minute preparations. The chapter comprises different sub-topics like relations and functions definition, relations and functions formulas, and various types of relations and functions. These sub-topics are elaborated with examples in the NCERT textbook, which is why going through the Relations and Functions Class 12 solutions PDF can be beneficial.

The Relations and Functions examples don't just stop at your school syllabus; they extend into the JEE mains questions as well. Preparing from sets, relations, and functions JEE mains questions and answers PDF will give you a competitive edge. Additionally, practicing relations and functions questions and answers PDF for Class 12 can help solidify your understanding of the chapter. For those who want to push their limits, diving into Relations and Functions Class 12 extra questions or working on a Relations and Functions worksheet might be a good idea.

But what if you still have queries? There are various platforms and resources that offer Relations and Functions Class 12 questions with solutions. You can even find Relations and Functions Class 12 objective questions and answers PDF to practice multiple-choice questions. This comprehensive approach will ensure you're well-prepared for any question, whether it's in your school exam, a worksheet, or a competitive exam like JEE.

In conclusion, Relations and Functions in Class 12 Maths is a chapter that lays the foundation for many mathematical concepts you'll learn in the future. So, ensure you use all the resources at your disposal—be it NCERT solutions, notes, worksheets, or extra questions—to master this chapter.

### Understanding Relations

Understanding Relations is the first step in getting a firm grasp on Chapter 1 of Class 12 Maths—Relations and Functions. Relations help us understand how one set is connected to another set through ordered pairs. For example, how students in a class are related to their roll numbers. Relations are a foundational concept, not just in Class 12 but also for competitive exams like JEE Mains. The NCERT solutions offer easy-to-understand explanations and examples for this concept.

### Relations and Functions Definition

Relations

In mathematics, a "relation" between two sets A and B is a collection of ordered pairs where the first element is from set A and the second element is from set B. In simpler terms, it's a way to connect or relate elements from one set to those in another set. For example, if we have a set of people and a set of cities, a relation could be the pairs of people and the city they live in.

### Functions

A "function" is a special type of relation. It also involves two sets A and B and pairs elements from A to B. What makes a function special is that each element in set A is paired with exactly one element in set B. In everyday language, you can think of a function as a machine that takes an input and gives an output. For example, if you have a function that squares numbers, then the input 2 would give the output 4.

In summary, relations and functions are ways of connecting elements from one set to another. While all functions are relations, not all relations are functions. This is because a function has a specific rule: each input must have only one output.

### Relations Examples

1. Student to Grade Relation: Consider a set of students $�=\left\{�����,���,�����\right\}$ and a set of grades $�=\left\{�,�,�\right\}$. A possible relation could be $\left\{\left(�����,�\right),\left(���,�\right),\left(�����,�\right)\right\}$.

2. Parent to Child Relation: Let's say we have a set of parents $�=\left\{��ℎ�,�����\right\}$ and a set of children $�=\left\{����,����\right\}$. A relation between them could be $\left\{\left(��ℎ�,����\right),\left(�����,����\right)\right\}$.

3. Symmetric Relation: In a set $�=\left\{1,2\right\}$, a symmetric relation could be $\left\{\left(1,2\right),\left(2,1\right)\right\}$.

### Functions Examples

1. Square Function: Here, the function takes a number and returns its square. So, if the input $�=2$, the output $�\left(�\right)=4$.

2. Identity Function: This is a simple function where the output is the same as the input. If $�=5$, then $�\left(�\right)=5$.

3. Age Function: Imagine a set of people $�=\left\{����,�����\right\}$ and their ages $�=\left\{25,30\right\}$. A function could map each person to their age: $\left\{\left(����,25\right),\left(�����,30\right)\right\}$.

The key difference between relations and functions is that in a function, each element from the first set maps to exactly one element in the second set. So, in the age function example, Alex cannot be both 25 and 30; he maps to one age only.

These are simple examples, but as you dig deeper into the topic, you'll encounter more complex situations. Examples like these are often part of the Class 12 NCERT solutions and help in preparing for JEE Mains questions as well. The more examples you go through, the clearer the concepts of relations and functions will become.

### Relations and Functions Formulas

1. Cartesian Product: Given two sets A and B, the Cartesian Product, denoted as $�×�$, is the set of all possible ordered pairs $\left(�,�\right)$ where $�\in �$ and $�\in �$.

2. Domain and Range: The domain of a function $�$ consists of all input values, while the range consists of all output values.

• Domain $�=\left\{�\mid \left(�,�\right)\in �\right\}$
• Range $�=\left\{�\mid \left(�,�\right)\in �\right\}$
3. Types of Relations:

• Reflexive Relation: $�=\left\{�\mid \left(�,�\right)\in �\right\}$
• Symmetric Relation: $\left(�,�\right)\in �⇒\left(�,�\right)\in �$
• Transitive Relation: $\left(�,�\right)\in �$ and $\left(�,�\right)\in �⇒\left(�,�\right)\in �$
4. Types of Functions:

• One-to-One (Injective): $�\left(�\right)=�\left(�\right)⇒�=�$
• Onto (Surjective): For every $�$ in set $�$, there exists an $�$ in set $�$ such that $�\left(�\right)=�$
• Bijective: A function is bijective if it is both one-to-one and onto.
5. Composite Function: Given two functions $�:�\to �$ and $�:�\to �$, the composite function $\left(�\circ �\right)\left(�\right)=�\left(�\left(�\right)\right)$.

6. Inverse Function: If $�:�\to �$ is a function, its inverse ${�}^{-1}:�\to �$