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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