Civil Engineering - Building Materials
Exercise :: Building Materials - Section 5
31. |
Permanent magnets are made of high carbon steel and |
A. |
15% of cobalt | B. |
20% of cobalt | C. |
35% of cobalt | D. |
45% of cobalt. |
Answer: Option D
Explanation:
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32. |
Plastics are compounds of carbon with element |
A. |
hydrogen | B. |
nitrogen | C. |
oxygen | D. |
All of these. |
Answer: Option D
Explanation:
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33. |
Pick up the correct statement from the following: |
A. |
The plastic bottles are made by the process of blowing | B. |
The plastic sheets are made by the calendering process in which the plastic material is allowed to pass between cylindrical rollers | C. |
The application of thermo-setting resins on sheets of paper, is called laminating process | D. |
The plastic articles made by placing raw material in the desired moulds, is known as moulding process | E. |
All the above. |
Answer: Option E
Explanation:
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34. |
Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following: |
A. |
Alumina | B. |
Lime | C. |
Ironoxide | D. |
Magnesia. |
Answer: Option A
Explanation:
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35. |
Cast iron is used for |
A. |
structural works in beams | B. |
small sized water pipes | C. |
columns and struts | D. |
none to these. |
Answer: Option C
Explanation:
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