21. Choose the most appropriate answer: Natural radioactivity was discovered by
22. In a nuclear reactor, one of the following is used as a fuel.
23. Alpha particle is the nucleus of an atom of
24. Energy stored in the nucleus of an atom is called
25. In nuclear reactor, heavy water is used as
26. Radioactive elements can be traced out in living cell through a technique called
27. The radiant energy having lowest energy is
28. The mercury and sodium street lamps light up because of :
29. Nuclear Reactors are based on which of the following phenomenon?
30. Which type of radiation has the lowest penetrating ability?
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