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Atoms Molecules And Nuclei QUESTIONS AND ANSWERS

IIT JEE : Atoms Molecules And Nuclei QUESTIONS AND ANSWERS :: part2 : 16 to 20

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

16.Nuclear reator in which uranium-235 is used as fuel, uses 2 kg of uranium-235 in 30 days. Then power output of the reactor will be (given : Energy released per fission = 185 MeV)

43.5 MW

58.5 MW

69.6 MW

73.1 MeV

17.Half lives of two radioactive substances are 20 and 40 minutes respectively. Initially samples were having equal number of nuclei. After 80 minutes ratio of the remaining numbers of A and B nuclei will be

1 : 8

1 : 16

1 : 4

16 : 1

18.A nucleus with A = 235 splits into two nuclei whose mass numbers are in the ratio 2 : 1. Ratio of heavier nuclei is

3.85 fm

4.91 fm

7.55 fm

8.03 fm

19.Uranium-235 is used as nuclear fuel in a nuclear reactor having power level 1 MW. Amount of fuel needed in one year will be (Given : energy released per fission = 200 MeV)

87 gm

103 gm

122 gm

148.5 gm

20.If 10% of a substance decays in 10 days, then approximate percentage of substance left after after 24 days is