21. The nuclear particle having no mass and no charge, but only spin is
22. The orientation of an atomic orbital is governed by
23. 'Atomic theory' of matter was given by
24. The most suitable unit for expressing nuclear radius is :
25. The total energy of revolving electron in an atom
26. Which one of the following elements is least likely to be found in commercial fertilisers?
27. Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ?
28. If the sewage is fully oxidized, the nitrogen is in the form of
29. If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by
30. Extensively used nitrogenous fertilizer is
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