Energy Flow in an Ecosystem — Science STD 9 — Question

What is sintering?

1. Take two aluminium channels of different lengths.
2. Place the lower ends of the channels on the floor and hold their upper ends at the same height.
3. Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.

Questions
1. At the moment of releasing the balls, which energy do the balls have?
2. As the balls roll down which energy is converted into which other form of energy?
3. Why do the balls cover the same distance on rolling down?
4. What is the form of the eventual total energy of the balls?
5. Which law related to energy does the above activity demonstrate? Explain.

State the three equations of motion and give the relationship explained by them.

Why are carbon and its compounds used as fuels?

Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.

In which compound forms does carbon occur?

State the achievements of Christian Medical College Hospital.

Give an account of the collective development scheme that was featured in the first four Five Year Plans.

Give the uses of Carbon dioxide.

What are the important substances that we use in day to day life? For what purposes do we use them?