Yes, it is necessary to solve the NCERT textbook questions for CBSE Class 10 exams. Here's why:

1. Comprehensive coverage:
- The NCERT textbooks are specifically designed to cover the entire syllabus of Class 10 as prescribed by CBSE.
- The questions provided in these textbooks are carefully crafted to ensure that students have a thorough understanding of each topic.
- By solving these questions, students can be confident that they have covered all the important concepts and are well-prepared for the exams.

2. Familiarity with exam pattern:
- The NCERT textbook questions are designed in a manner that reflects the pattern and style of questions that are likely to be asked in the CBSE Class 10 exams.
- By regularly practicing these questions, students become familiar with the exam pattern and are better prepared to tackle similar questions in the actual exams.

3. Clarification of concepts:
- The NCERT textbooks provide detailed explanations and examples for each topic.
- By solving the textbook questions, students can gain a better understanding of the concepts and clarify any doubts they may have.
- This helps in building a strong foundation and ensures that students have a clear understanding of the subject matter.

4. Application of knowledge:
- The NCERT textbook questions are designed to test the application of knowledge rather than rote memorization.
- By solving these questions, students develop the ability to apply their knowledge to solve real-life problems or analyze different scenarios.
- This helps in developing critical thinking and problem-solving skills, which are essential for higher education and future careers.

5. Time management:
- Solving the NCERT textbook questions regularly helps students in managing their time effectively during the exams.
- It allows them to practice answering questions within the given time frame and improves their speed and accuracy.
- This is crucial as time management plays a crucial role in scoring well in the CBSE Class 10 exams.

Conclusion:
Solving the NCERT textbook questions is essential for CBSE Class 10 students as it provides comprehensive coverage, familiarizes them with the exam pattern, clarifies concepts, helps in the application of knowledge, and improves time management skills. It is a valuable resource for exam preparation and ensures that students are well-prepared for their exams.