Page 138 - Viva ICSE Science 4 : E-book

E. Answer the following questions.

1. Discuss the causes of air pollution.

2. Diff erentiate between evaporation and condensation.

3. Explain the process of sedimentation and decantation.

4. Explain the properties of light.

5. How is a shadow formed? Why are some shadows dark and some faint?

6. Defi ne measurement. How will you measure the length of a line using a ruler?

7. What is the normal temperature of the human body? Name the device used to
measure it.

8. Defi ne force. Name four types of forces.

9. What are push and pull? Give two examples of each.

10. Write about any three uses of friction.

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