IIT JEE Questions And Answers :: Atoms Molecules And Nuclei: part1



IIT JEE : Atoms Molecules And Nuclei QUESTIONS AND ANSWERS :: part1 : 11 to 15

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

11.Activity of a radioactive material decreases to one third in 10 years. After 10 more years, final activity will be

same as the original value
1 / 4 th of the original value
1 / 9 th of the original value
1 / 16 th of the original value

12.Count rate of a GM count for the radiations of a radioactive material having half life of 30 minutes decrease to 5/sec in two hours. Then initial count rate of the material was

20/sec
80/sec
90/sec
25/sec

13.Energy of the first excited state of hydrogen atom is

- 3.4 eV
- 1.51 eV
- 27.2 eV
- 3.02 eV

14.Half life of an atom A is 2 days. If we start with 60,000 atoms of that material, number of atoms left over after 8 days will be

1875
3750
7500
15000

15.If the half of a radioactive material is 2 days at NTP, then on increasing the pressure to 16 atmospheres, new half life of the material will be

16 days
8 days
4 days
2 days

More Atoms Molecules And Nuclei QUESTIONS AND ANSWERS available in next pages

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