1. Optic fibres are mainly used for which of the following ?

 
 
 
 

2. Detergents used for cleaning clothes and utensils contain

 
 
 
 

3. What are soaps ?

 
 
 
 

4. Which one of the following is the petroleum wax ?

 
 
 
 

5. Paper is manufactured by

 
 
 
 

6. Which of the following materials are used for preparing blue-black ink

 
 
 
 

7. Wood is the main raw material for the manufacture of

 
 
 
 

8. which of the following is commonly called a polyamide

 
 
 
 

9. The type of glass used in making lenses and prisms is

 
 
 
 

10. which type of fire extinguisher is used for petroleum fire ?

 
 
 
 

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