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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