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The hardest substance available on earth is

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1) Which of the following is a protein?

2) Who suggested that most of the mass of the atom is located in the nucleus?

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

4) The wavelength of X-rays is of the order of

5) Which of the following is used as a moderator in nuclear reactor?

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