Civil Engineering - Building Materials

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:

No answer description available for this question. Let us discuss.

32. 

Plastics are compounds of carbon with element

A. hydrogen
B. nitrogen
C. oxygen
D. All of these.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us 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:

A. Alumina
B. Lime
C. Ironoxide
D. Magnesia.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us discuss.