Civil Engineering - Building Materials

46. 

Pick up the non-inflammable plastic from the following:

A. Cellulose acetate plastics
B. Polyvinyl chloride plastics
C. Phenol formaldehyde plastic
D. Urea formaldehyde plastic.

Answer: Option B

Explanation:

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47. 

The most commonly used synthetic abrasive is

A. aluminium carbide
B. boric acid
C. silicon
D. All of these.

Answer: Option D

Explanation:

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48. 

For light and ornamental casting, the most unsuitable pig iron, is

A. Bessemer pig
B. Grey or foundry pig
C. White or forge pig
D. Mottled pig.

Answer: Option D

Explanation:

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49. 

Seasoning of timber is essential to remove

A. knots from timber
B. sap from timber
C. twisted fibre from timber
D. roughness of timber.

Answer: Option B

Explanation:

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50. 

The melting point of silica is :

A. 1570°C
B. 1630°C
C. 1730°C
D. 1850°C.

Answer: Option C

Explanation:

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