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Everyday Science Basic Multiple Questions and Answers.
| 41. | Radioactivity was first discovered by | ||
| A. | Pasture | ||
| B. | Newton | ||
| C. | Waston | ||
| D. | Madam | ||
| 42. | Which gas is commonly used in balloons and airships? | ||
| A. | Hydrogen | ||
| B. | Helium | ||
| C. | Carbon | ||
| D. | Hydrogen sulphide | ||
| 43. | The sky appears blue because the earth's atmosphere | ||
| A. | Scatters blue light | ||
| B. | Reflects blue light | ||
| C. | Transmits blue light | ||
| D. | Has actual blue color | ||
| 44. | The most abundant element in earth's crust is | ||
| A. | Silicone | ||
| B. | Iron | ||
| C. | Aluminum | ||
| D. | Oxygen | ||
| 45. | Heating element of an electric heater is made up of | ||
| A. | Tungsten | ||
| B. | Graphite | ||
| C. | Chromium | ||
| D. | Nichrome | ||
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