| 1. | 'Atom' name was given by |
| a. | Democritus |
| b. | Bohr |
| c. | Rutherford |
| d. | Archimedes |
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Answer: (a).Democritus
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| 2. | Number of unstable isotopes are |
| a. | 300 |
| b. | 50 |
| c. | 370 |
| d. | 360 |
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Answer: (a).300
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| 3. | Empirical formula of benzene is similar to |
| a. | water |
| b. | glycerin |
| c. | hydrogen peroxide |
| d. | glucose |
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Answer: (c).hydrogen peroxide
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| 4. | Relative number of ions in mass spectrometer is plotted as |
| a. | shells |
| b. | z axis |
| c. | abscissa |
| d. | ordinate |
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Answer: (d).ordinate
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| 5. | Isotopes present in nature are |
| a. | 270 |
| b. | 280 |
| c. | 290 |
| d. | 300 |
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Answer: (b).280
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