| 1. | Brass is an example of |
| a. | An alloy |
| b. | a compound |
| c. | a mixture |
| d. | an element |
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Answer: (a).An alloy
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| 2. | A particle may be |
| a. | an atom |
| b. | a molecule |
| c. | an isotope |
| d. | all of these |
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Answer: (d).all of these
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| 3. | Other than O and C, main elements of a brick wall includes |
| a. | Silicon (Si) |
| b. | Calcium (Ca) |
| c. | Aluminum (Al) |
| d. | both a and b |
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Answer: (d).both a and b
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| 4. | Symbol of Magnesium is |
| a. | Mg |
| b. | Mn |
| c. | Hg |
| d. | M |
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Answer: (a).Mg
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| 5. | Naturally occurring elements are |
| a. | 82 |
| b. | 92 |
| c. | 99 |
| d. | above 100 by now |
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Answer: (b).92
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