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131 . Which of these is used as moderator in nuclear reactor
A. Uraphite B. Helium gas
C. Heavy water D. All of the above

132 . Two atoms are said to be isotopes if -
A. They have the same atomic number but different mass numbers 
B. They have the same number of neutrons but different mass numbers.
C. They have the same number of neutrons but different modes of radioactive decay.
D. The sum of the number of protons and neutrons is the same, but the number of protons is different. 




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