Which of the following is used in Pencils?

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Which of the following is unit of amount of substance?

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Which layer of the earth’s atmosphere reflect back the radio waves to the earth’s surface ?

ionospher stratosphere mesosphere exosphere...

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“Plague” is a disease; spreads by__________?

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Saliva helps in the digestion of ?

A: Carbohydrates  B: Proteins C: Lipids D: Fats...