| 46. | To explain origin of spectral lines |
| a. | one quantum number is sufficient |
| b. | no quantum number is needed |
| c. | one quantum number is not enough |
| d. | one quantum number adds up with another one |
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Answer: (c).one quantum number is not enough
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| 47. | Value of 'm' depends upon values of |
| a. | s |
| b. | l |
| c. | d |
| d. | f |
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Answer: (b).l
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| 48. | Distance between two adjacent crests or troughs is called |
| a. | wave number |
| b. | frequency |
| c. | wave length |
| d. | radiation |
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Answer: (c).wave length
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| 49. | Balmer series were discovered in |
| a. | 1867 |
| b. | 1887 |
| c. | 1789 |
| d. | 1901 |
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Answer: (b).1887
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| 50. | Aluminium foil causes cathode rays to |
| a. | pass through it |
| b. | struck in it |
| c. | distort |
| d. | loose their identity |
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Answer: (a).pass through it
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