Concept-wise Practice

function basics MCQ Questions for Class 12

function basics se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

7 questions tagged with function basics.

Question 1/7 Expert Mathematics Relations and Functions One-one function Class 12 Level 23

यदि \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=5) है, तो (f) के बारे में सही कथन चुनिए।

If \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=5), choose the correct statement about (f).

Explanation opens after your attempt
Correct Answer

B. यह एकैकी नहीं हैIt is not one-one

Step 1

Concept

A constant function gives the same value for every (x).

Step 2

Why this answer is correct

(f(1)=5) and (f(2)=5), while \(1\ne2\).

Step 3

Exam Tip

A constant function on a domain with more than one element is never one-one. चरण 1: स्थिर फलन हर (x) के लिए एक ही मान देता है। चरण 2: (f(1)=5) और (f(2)=5), जबकि \(1\ne2\)। चरण 3: स्थिर फलन बड़े प्रांत पर कभी भी एकैकी नहीं होता।

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Question 2/7 Easy Mathematics Relations and Functions Functions Class 12 Level 21

यदि \(f:R\to R\), (f(x)=x), तो (\(f\circ f\)(x)) क्या होगा?

If \(f:R\to R\), (f(x)=x), what is (\(f\circ f\)(x))?

Explanation opens after your attempt
Correct Answer

A. (x)

Step 1

Concept

(f(x)=x) is the identity function.

Step 2

Why this answer is correct

(\(f\circ f\)(x)=f(f(x))=f(x)).

Step 3

Exam Tip

Therefore (\(f\circ f\)(x)=x). चरण 1: (f(x)=x) पहचान फलन है। चरण 2: (\(f\circ f\)(x)=f(f(x))=f(x))। चरण 3: इसलिए (\(f\circ f\)(x)=x) होगा।

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Question 3/7 Easy Mathematics Relations and Functions Functions Class 12 Level 21

यदि \(f=\{(4,1),(5,1),(6,2)\}\), तो (f) का प्रान्त क्या है?

If \(f=\{(4,1),(5,1),(6,2)\}\), what is the domain of (f)?

Explanation opens after your attempt
Correct Answer

A. ({4,5,6})

Step 1

Concept

The domain is formed by the first components of ordered pairs.

Step 2

Why this answer is correct

The first components are (4,5,6).

Step 3

Exam Tip

Therefore the domain is ({4,5,6}). चरण 1: प्रान्त क्रमित युग्मों के पहले घटकों से बनता है। चरण 2: पहले घटक (4,5,6) हैं। चरण 3: इसलिए प्रान्त ({4,5,6}) है।

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Question 4/7 Easy Mathematics Relations and Functions Functions Class 12 Level 20

फलन \(f:A\to B\) में यदि \(a\in A\), तो (a) को क्या माना जाता है?

In a function \(f:A\to B\), if \(a\in A\), what is (a) considered as?

Explanation opens after your attempt
Correct Answer

A. आगतInput

Step 1

Concept

(A) is the domain of the function.

Step 2

Why this answer is correct

Elements of the domain are treated as inputs.

Step 3

Exam Tip

The image of an input lies in (B). चरण 1: (A) फलन का प्रान्त होता है। चरण 2: प्रान्त के अवयवों को आगत माना जाता है। चरण 3: आगत की छवि (B) में मिलती है।

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Question 5/7 Easy Mathematics Relations and Functions Functions Class 12 Level 19

यदि \(f:R\to R\), (f(x)=x+2), तो (f^{-1}(5)) क्या होगा?

If \(f:R\to R\), (f(x)=x+2), what is (f^{-1}(5))?

Explanation opens after your attempt
Correct Answer

A. (3)

Step 1

Concept

(f^{-1}(5)) means the (x) for which (f(x)=5).

Step 2

Why this answer is correct

From (x+2=5), we get (x=3).

Step 3

Exam Tip

Therefore (f^{-1}(5)=3). चरण 1: (f^{-1}(5)) का अर्थ है वह (x) जिसके लिए (f(x)=5)। चरण 2: (x+2=5) से (x=3) मिलता है। चरण 3: इसलिए (f^{-1}(5)=3)।

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Question 6/7 Easy Mathematics Relations and Functions Functions Class 12 Level 19

फलन (f(x)=x-4) का प्रतिलोम क्या होगा?

What is the inverse of the function (f(x)=x-4)?

Explanation opens after your attempt
Correct Answer

A. (f^{-1}(x)=x+4)

Step 1

Concept

Let (y=x-4).

Step 2

Why this answer is correct

Then (x=y+4).

Step 3

Exam Tip

Therefore the inverse is (f^{-1}(x)=x+4). चरण 1: (y=x-4) मान लें। चरण 2: (x=y+4) मिलता है। चरण 3: इसलिए प्रतिलोम (f^{-1}(x)=x+4) है।

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Question 7/7 Easy Mathematics Relations and Functions Functions Class 12 Level 19

यदि \(f=\{(1,2),(2,4),(3,6)\}\), तो (f) का परास कौन-सा है?

If \(f=\{(1,2),(2,4),(3,6)\}\), what is the range of (f)?

Explanation opens after your attempt
Correct Answer

A. ({2,4,6})

Step 1

Concept

The range is the set of actual images obtained from the function.

Step 2

Why this answer is correct

The second components of the ordered pairs are (2,4,6).

Step 3

Exam Tip

Hence the range is ({2,4,6}). चरण 1: परास उन वास्तविक छवियों का समुच्चय होता है जो फलन से मिलती हैं। चरण 2: क्रमित युग्मों में दूसरे घटक (2,4,6) हैं। चरण 3: इसलिए परास ({2,4,6}) है।

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