Q. How many colours the sunlight spectrum has?

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Q. Which is/are the important raw material(s) required in cement industry?

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Q. Which type of fire extinguisher is used for petroleum fire?

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Q. Which of the following is commonly called a 'polyamide'?

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Q. Epoxy resins are used as

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Q. Detergents used for cleaning clothes and utensils contain?

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Q. Which of the following is used for removing air bubbles from glass during its manufacture?

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Q. Which of the following is a protein?

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

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Q. Rayon is chemically

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

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Q. The major ingredient of leather is

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Q. What are the soaps?

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Q. How does common salt help in separating soap from the solution after saponification?

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Q. In vulcanisation, natural rubber is heated with

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Q. Deep blue colour is imparted to glass by the presence of

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Q. Glass is made of the mixture of

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

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Q. Paper is manufactured by

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Q. Gypsum is added to cement clinker to

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