Concept-wise Practice

one one proof MCQ Questions for Class 12

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

Practice Questions

4 questions tagged with one one proof.

Question 1/4 Medium Mathematics Relations and Functions One-one function Class 12 Level 24

यदि \(f:\mathbb{R}\to\mathbb{R}\) और (f(x)=\frac{3x-1}{5}) है, तो (f) के लिए सही कथन चुनिए।

If \(f:\mathbb{R}\to\mathbb{R}\) and (f(x)=\frac{3x-1}{5}), choose the correct statement for (f).

Explanation opens after your attempt
Correct Answer

A. एकैकी हैOne-one

Step 1

Concept

Assume (f(a)=f(b)).

Step 2

Why this answer is correct

From \(\frac{3a-1}{5}=\frac{3b-1}{5}\), we get (3a-1=3b-1), so (a=b).

Step 3

Exam Tip

A non-zero constant denominator does not change the one-one nature of a linear function. चरण 1: मान लें (f(a)=f(b))। चरण 2: \(\frac{3a-1}{5}=\frac{3b-1}{5}\) से (3a-1=3b-1), इसलिए (a=b)। चरण 3: हर में स्थिर गैर-शून्य संख्या हो तो रैखिक एकैकीपन नहीं बदलता।

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Question 2/4 Medium Mathematics Relations and Functions One-one function Class 12 Level 24

यदि \(f:\mathbb{R}\to\mathbb{R}\) और (f(x)=4x+4) है, तो (f(a)=f(b)) से क्या निष्कर्ष निकलेगा?

If \(f:\mathbb{R}\to\mathbb{R}\) and (f(x)=4x+4), what conclusion follows from (f(a)=f(b))?

Explanation opens after your attempt
Correct Answer

A. (a=b)

Step 1

Concept

Writing (f(a)=f(b)) gives (4a+4=4b+4).

Step 2

Why this answer is correct

Subtracting (4) and dividing by (4) gives (a=b).

Step 3

Exam Tip

This is the standard method to prove one-one nature. चरण 1: (f(a)=f(b)) लिखने पर (4a+4=4b+4) मिलता है। चरण 2: दोनों ओर से (4) घटाने और (4) से भाग देने पर (a=b)। चरण 3: यही प्रक्रिया एकैकीपन सिद्ध करने की मानक विधि है।

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Question 3/4 Easy Mathematics Relations and Functions Functions Class 12 Level 21

फलन \(f:R\to R\), (f(x)=5x-2) एक-एकी क्यों है?

Why is \(f:R\to R\), (f(x)=5x-2), one-one?

Explanation opens after your attempt
Correct Answer

A. क्योंकि (f(a)=f(b)) से (a=b) मिलता हैBecause (f(a)=f(b)) gives (a=b)

Step 1

Concept

Assume (f(a)=f(b)).

Step 2

Why this answer is correct

Then (5a-2=5b-2), so (5a=5b).

Step 3

Exam Tip

This gives (a=b), so the function is one-one. चरण 1: मान लें (f(a)=f(b))। चरण 2: तब (5a-2=5b-2), इसलिए (5a=5b)। चरण 3: इससे (a=b) मिलता है, इसलिए फलन एक-एकी है।

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

फलन \(f:R\to R\), (f(x)=3x+1) एक-एकी क्यों है?

Why is \(f:R\to R\), (f(x)=3x+1), one-one?

Explanation opens after your attempt
Correct Answer

A. क्योंकि (f(a)=f(b)) से (a=b) मिलता हैBecause (f(a)=f(b)) gives (a=b)

Step 1

Concept

Assume (f(a)=f(b)).

Step 2

Why this answer is correct

Then (3a+1=3b+1), so (3a=3b) and (a=b).

Step 3

Exam Tip

Hence different inputs have different images, so the function is one-one. चरण 1: मान लें (f(a)=f(b))। चरण 2: तब (3a+1=3b+1), इसलिए (3a=3b) और (a=b)। चरण 3: इसलिए अलग आगतों की छवियाँ अलग होंगी और फलन एक-एकी है।

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