Concept-wise Practice

bounded below MCQ Questions for Class 12

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

Practice Questions

1 questions tagged with bounded below.

यदि \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=x-2+\sin x), तो नीचे दिए गए कथनों में निश्चित रूप से सही कौन सा है?

If \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=x-2+\sin x), which of the following statements is definitely correct?

Explanation opens after your attempt
Correct Answer

B. (f) सर्वाच्छादक नहीं है क्योंकि बहुत बड़ी ऋणात्मक संख्याएँ छवि नहीं बनतीं(f) is not onto because very large negative numbers are not images

Step 1

Concept

Since \(x^2\ge0\) and \(\sin x\ge-1\), (f(x)\ge-1).

Step 2

Why this answer is correct

The codomain \(\mathbb{R}\) contains values like (-2), but they cannot be images.

Step 3

Exam Tip

Even without the exact range, a lower bound can disprove onto property. चरण 1: \(x^2\ge0\) और \(\sin x\ge-1\), इसलिए (f(x)\ge-1)। चरण 2: सहप्रांत \(\mathbb{R}\) में (-2) जैसे मान हैं, पर वे छवि नहीं बन सकते। चरण 3: पूर्ण परास न मिले तब भी निचली सीमा दिखाकर सर्वाच्छादकता तोड़ी जा सकती है।

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.