1 .The chemical which is used in art and craft and can cause anemia and leukemia is —

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2 .What are the signals that inf orm the operating system that some activity has taken place, called —

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3 .A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum :

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4 .Which acid is stored in batteries ?

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5 .The inert gas which is substituted for nitrogen in the air used by deep sea divers for Breathing is :

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6 .Who invented aeroplane ?

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7 .Hydraul i c machi nes work under the Principle on —

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8 .Air bladder in fish acts as :

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9 .For a ray of light to suffer total internal reflection it has to pass from —

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10 . Lime water is kept in the air, it turns milky due to presence of ______

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