Category: Class 9 Science

NCERT Solutions for Class 9 Science for CBSE exams 2020-2021.

Discussion Forum Latest Questions

Ayushree

Physicist Meghnad Saha simplified stars by treating them as hot gases instead of modeling every complex reaction. By focusing solely on temperature, pressure and ionization, he successfully linked a star’s color to its temperature.

Ayushree

An adult requires 2,000-2,500 kcal daily. By estimating the calories provided by 100g of rice, you can determine the family’s monthly requirement. This helps ensure your estimate remains logical and avoids extremes like starvation.

Ayushree

Masks work by integrating physics, chemistry and biology. They use fiber meshes to physically block particles, while electrostatic attraction traps smaller pathogens. Biology defines the virus size and math models the airflow efficiency.

Ayushree

Science views failure as a necessary correction, not a weakness. When a prediction fails, it reveals flaws in the underlying model. This forces scientists to refine their assumptions, leading to more accurate, reliable knowledge.