| 36. | Window through which X Rays move in experiment is made up of |
| a. | platinum |
| b. | iron |
| c. | steel |
| d. | aluminum |
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Answer: (d).aluminum
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| 37. | Quantum numbers are used to describe |
| a. | proton |
| b. | nucleus |
| c. | electron |
| d. | positron |
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Answer: (c).electron
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| 38. | Element volatilized for continuous spectrum effect the |
| a. | number of lines of spectrum |
| b. | continuity of spectrum |
| c. | thickness |
| d. | color |
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Answer: (a).number of lines of spectrum
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| 39. | In formula 2n2 principle quantum number cannot have value of |
| a. | one |
| b. | three |
| c. | two |
| d. | zero |
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Answer: (d).zero
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| 40. | 1 Cycle per second is equal to |
| a. | decibels |
| b. | Hz |
| c. | per second |
| d. | none |
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Answer: (b).Hz
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