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



IIT JEE : Atoms Molecules And Nuclei QUESTIONS AND ANSWERS :: part1 : 1 to 5

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2014 examinations :

1.Half life of a radioactive material is 2 days. If the original material is 1 kg, then how much of it will be left after 6 days ?

125 gms
250 gms
500 gms
750 gms

2.Number of electrons in the outermost shell of a calcium atom is

1
2
3
4

3.Two electrons move around a nucleus in circular orbits of radii r and 4r. Ratio of their frequencies is

1 : 4
4 : 1
8 : 1
1 : 8

4.If an hydrogen atom is excited to a state corresponding to n = 4, then according to Bohr s theory, no. of lines emitted will be

3
4
5
6

5.Energy of the emitted photons in a hydrogen atom, when an electron jumps from first excited state to ground state is

13.6 eV
10.2 eV
- 13.6 eV
10.2 eV

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

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