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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