| 16. | Spectrum of different colored lines is characteristic of |
| a. | sodium |
| b. | potassium |
| c. | hydrogen |
| d. | nitrogen |
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Answer: (c).hydrogen
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| 17. | Cathode rays produced yellow fluorescence when strike |
| a. | alumina |
| b. | sodium |
| c. | tin stone |
| d. | potassium chromate |
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Answer: (c).tin stone
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| 18. | When an electron jumps from its orbit to another orbit, energy is |
| a. | emitted only |
| b. | absorbed only |
| c. | emitted and absorbed |
| d. | no effect |
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Answer: (c).emitted and absorbed
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| 19. | Unit used for measuring wavelength is |
| a. | angstrom |
| b. | centimeter |
| c. | meter |
| d. | millimeter |
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Answer: (a).angstrom
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| 20. | Magnetic quantum number is also called |
| a. | 1st quantum number |
| b. | 2nd quantum number |
| c. | 3rd quantum number |
| d. | 4th quantum number |
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Answer: (c).3rd quantum number
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