Q5 of 46 Page 268

The atomic number of natural radioactive element is _________.

After atomic number 82 which is Lead(Pb) , there are the radioactive elements , which are highly unstable and humans cannot go near it as it is. We cannot choose less than 82 and less than 92 because they include simple metals and non-metals too.

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3

Kilowatt-hour is the unit of __________.

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________ surface absorbs more heat than any other surface under identical conditions.

 6

Which one of the following statements does not represents Ohm’s law?

(i) current / potential difference = constant


(ii) potential difference / current = constant


(iii) current = resistance x potential difference

 7

What is the major fuel used in thermal power plants?