Civil Engineering - Building Materials

31.
Permanent magnets are made of high carbon steel and
15% of cobalt
20% of cobalt
35% of cobalt
45% of cobalt.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

32.
Plastics are compounds of carbon with element
hydrogen
nitrogen
oxygen
All of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

33.
Pick up the correct statement from the following:
The plastic bottles are made by the process of blowing
The plastic sheets are made by the calendering process in which the plastic material is allowed to pass between cylindrical rollers
The application of thermo-setting resins on sheets of paper, is called laminating process
The plastic articles made by placing raw material in the desired moulds, is known as moulding process
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

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:
Alumina
Lime
Ironoxide
Magnesia.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

35.
Cast iron is used for
structural works in beams
small sized water pipes
columns and struts
none to these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.