Q. The two elements that are frequently used for making transistors are

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Q. The filament of an electric bulb is made of

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Q. Diamond is an allotropic form of

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Q. In fireworks, the green flame is produced because of

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Q. Permanent hardness of water can be removed by adding

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Q. Marsh gas is

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Q. LPG consists of mainly

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Q. Air is a/an

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Q. Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?

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Q. Balloons are filled with

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Q. Which of the following does not contain a coinage metal?

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Q. Which metal pollute the air of a big city?

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Q. Bell metal is an alloy of

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Q. Which of the following is not an isotope of hydrogen?

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Q. The main constituents of pearls are

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Q. Amalgams are

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Q. Which of the following is the lightest metal?

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Q. Which of the following metals remain in liquid for under normal conditions?

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Q. Potassium Permanganate is used for purifying drinking water, because

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Q. Which of the following is an element?

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