| 41. | Voltage which is applied in discharge tube is dependent upon |
| a. | length of tube |
| b. | width of tube |
| c. | tube nature |
| d. | wideness |
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Answer: (a).length of tube
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| 42. | Measurement of e/m was possible because of instrument made by |
| a. | JJ Thomson |
| b. | J Perrin |
| c. | Edison |
| d. | Bohr |
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Answer: (a).JJ Thomson
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| 43. | Accelerated electrons like waves performed |
| a. | diffraction |
| b. | movement |
| c. | absorbed potential energy |
| d. | all of these |
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Answer: (a).diffraction
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| 44. | Planck proposed that energy travels in |
| a. | discontinuous manner |
| b. | continuous manner |
| c. | slow manner |
| d. | general manner |
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Answer: (a).discontinuous manner
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| 45. | Magnetic properties of cathode rays were discovered in year |
| a. | 1897 |
| b. | 1895 |
| c. | 1893 |
| d. | 1890 |
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Answer: (a).1897
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