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react with U to release energy
produce neutrons
undergo combustion which triggers the nuclear fission
convert fast moving neutrons into thermal neutrons
The Green House effect is produced due to the presence of excess amount of
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
The hardened material available on earth is
The hardest form of carbon is
The heat energy produced when the human body metabolises 1 gram of fat is
The heat required to raise the temperature of body by 1 K is called
The high reactivity of fluorine is due to
The hottest part of the gas flame is known as
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
The hydronium ion is