1. What is ventilation?

2. Why is ventilation necessary?

3. What are the different methods of ventilation?

4. Describe each method of ventilation.

5. What are the waste products of industrial processes?

6. Describe the changes that take place in the human body and some of the waste products.

7. Name some noxious gases and the evil effects produced by them.

8. Name some of the forms of dust found in industries.

9. What are some of the causes of tuberculosis?