Concept-wise Practice

range interval MCQ Questions for Class 12

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

Practice Questions

3 questions tagged with range interval.

Question 1/3 Expert Mathematics Relations and Functions Onto function Class 12 Level 27

यदि \(f:\mathbb{R}\to\mathbb{R}\) जहाँ (f(x)=\frac{x-2}{1+x-2}), तो (f) आच्छादी क्यों नहीं है?

If \(f:\mathbb{R}\to\mathbb{R}\), where (f(x)=\frac{x-2}{1+x-2}), why is (f) not onto?

Explanation opens after your attempt
Correct Answer

A. क्योंकि इसका परिसर ([0,1)) हैBecause its range is ([0,1))

Step 1

Concept

Since \(x^2\ge0\), the value is at least (0).

Step 2

Why this answer is correct

Also \(\frac{x^2}{1+x^2}<1\), so (1) and larger values are not attained.

Step 3

Exam Tip

Compare numerator and denominator to understand the range. चरण 1: \(x^2\ge0\), इसलिए मान (0) या उससे बड़ा है। चरण 2: \(\frac{x^2}{1+x^2}<1\), इसलिए (1) और उससे बड़े मान नहीं मिलते। चरण 3: भिन्न में अंश-हर की तुलना से परिसर समझें।

Login to save your score, XP, coins and progress.

Open Question Page
Ask Friends
Question 2/3 Hard Mathematics Relations and Functions Onto function Class 12 Level 27

यदि (f:\mathbb{R}\to(-1,1)) और (f(x)=\frac{x}{1+|x|}), तो (f) सर्वाच्छादक है या नहीं?

If (f:\mathbb{R}\to(-1,1)) and (f(x)=\frac{x}{1+|x|}), is (f) onto or not?

Explanation opens after your attempt
Correct Answer

A. सर्वाच्छादक हैIt is onto

Step 1

Concept

The range of this function is ((-1,1)).

Step 2

Why this answer is correct

For \(y\ge0\), take \(x=\frac{y}{1-y}\), and for (y<0), take \(x=\frac{y}{1+y}\).

Step 3

Exam Tip

For modulus-based expressions, checking cases separately is helpful. चरण 1: इस फलन का परास ((-1,1)) है। चरण 2: हर \(y\in(-1,1)\) के लिए \(y\ge0\) होने पर \(x=\frac{y}{1-y}\) और (y<0) होने पर \(x=\frac{y}{1+y}\) लिया जा सकता है। चरण 3: खंडों में परिभाषित व्यवहार को अलग-अलग जाँचना लाभदायक है।

Login to save your score, XP, coins and progress.

Open Question Page
Ask Friends
Question 3/3 Medium Mathematics Relations and Functions Onto function Class 12 Level 27

यदि (f:\mathbb{R}\to (0,1]), (f(x)=\frac{1}{1+x-2}), तो (f) कैसा है?

If (f:\mathbb{R}\to (0,1]), (f(x)=\frac{1}{1+x-2}), what type is (f)?

Explanation opens after your attempt
Correct Answer

A. आच्छादक हैOnto

Step 1

Concept

At (x=0), the value (1) is obtained.

Step 2

Why this answer is correct

As (x) grows large, the value approaches (0) but never becomes (0), so the range is ((0,1]).

Step 3

Exam Tip

Whether a boundary value is attained matters in onto questions. चरण 1: (x=0) पर मान (1) मिलता है। चरण 2: (x) बड़ा होने पर मान (0) के पास जाता है पर (0) नहीं होता इसलिए परास ((0,1]) है। चरण 3: सीमा पर मिले या न मिले यह आच्छादकता में महत्वपूर्ण है।

Login to save your score, XP, coins and progress.

Open Question Page
Ask Friends
Student Class Required

Select your class first

Quiz questions, daily challenge and practice pages will open according to your selected class. Class 11/12 ke liye stream bhi select karein.