21.
The vast resources of unutilised natural gas can be used in the production of

22.
Paper is manufactured by

23.
Gypsum is added to cement clinker to

24.
Soap is a mixture of sodium or potassium salts of

25.
The type of glass used in making lenses and prisms is

26.
Which one of the following is the petroleum wax?

27.
What cause a moving body to resist a change in its state of motion?

29.
AIDS is caused by:

30.
Which of the following schemes is launched for the school going children:

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