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 2024 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 |
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