Carbon: An Important Element — Science STD 9 — Question

Write short note : Industrial waste

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

Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi? (Ans: 3 J)

What is tropic movement? Describe the different types of tropic movements.
OR
What are growth relevant movements? Describe the different types of growth relevant movements.

Short note : Turner syndrome.

Molecular formula – NaOH

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.

Give the uses of radioactive isotopes in Luminescent paint and radioluminescence.

Using the chart of ions/radicals and the cross-multiplication method, write the chemical formulae of the following compounds:
Copper sulphate

What are salts?