Sound — Science STD 9 — Question

If you are provided with some vegetables to cook, we generally add salt to the vegetables during cooking process. After adding salt, vegetables releases water. What mechanism is responsible for this?

We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol, etc. What mechanisms are Involved in absorption of digested food and water?

Explain how, the total energy a swinging pendulum at any instant of time remains conserved. Illustrate your answer with the help of a labeled diagram.

State Newton’s first law of motion. Give two examples to illustrate Newton’s first law of motion.

Explain the term-Varietal Improvement.

Name the energy transfers which occur when:

1. An electric bell rings.
2. Someone speaks into a microphone.
3. There is a picture on a television screen.
4. A torch is on.