21). The most abundant metal in the earth's crust is :
A). zinc |
B). copper |
C). aluminium |
D). iron |
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22). Which of the following is the second most abundant metal in the earth's crust?
A). Copper |
B). Aluminium |
C). Iron |
D). Zinc |
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23). Arrange the following metals in the decreasing order of their relative abundance in earth's crust after aluminium : 1. Calcium 2. Iron 3. Sodium 4. Magnesium
A). 1, 4, 2, 3 |
B). 1, 2, 4, 3 |
C). 2, 1, 3, 4 |
D). 2, 1, 4, 3 |
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24). The most malleable metal is :
A). Silver |
B). Gold |
C). Aluminium |
D). Sodium |
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25). Air is a/an :
A). compound |
B). element |
C). mixture |
D). electrolyte |
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26). Balloons are filled with :
A). helium |
B). oxygen |
C). nitrogen |
D). argon |
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27). Which of the following is used in beauty parlours for hair setting?
A). Chlorine |
B). Sulphur |
C). Phosphorus |
D). Silicon |
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28). Which of the following is the lightest gas?
A). Nitrogen |
B). Hydrogen |
C). Ammonia |
D). Carbon dioxide |
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29). Match the following : Alloy Composition A. Bronze 1. Lead B. Brass 2. Copper, zinc, nickel C. German Silver 3. Copper, zinc D. Type metal 4. Copper, tin Below options are given in A B C D order.
A). 2 1 3 4 |
B). 2 1 3 4 |
C). 3 2 1 4 |
D). 4 3 2 1 |
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30). Gobar gas contains mainly :
A). methane |
B). carbon dioxide |
C). butane |
D). carbon monoxide |
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