Civil Engineering - Building Materials

36. 

The cast iron when heated to red heat with powdered red haemetite in an oven for increasing its toughness, is converted to

A. grey cast iron
B. white cast iron
C. mottled cast iron
D. toughed cast iron.

Answer: Option C

Explanation:

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37. 

Jhumb bricks are

A. under burnt
B. over burnt
C. kutcha
D. none of these.

Answer: Option B

Explanation:

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38. 

Plastic bitumen is generally used for

A. road pavements
B. expansion joints
C. crack fillings
D. none to these.

Answer: Option C

Explanation:

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39. 

Pick up the correct statement from the following:

A. The heating of a material to redness in contact with air, is known as calcination
B. The property of lime by which it sets or hardens in damp places having no free circulation of air is called setting
C. The product that remains after calcination of limestone, is called lime
D. All the above.

Answer: Option D

Explanation:

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40. 

The commonly used thinner in oil paints, is

A. naptha
B. turpentine
C. both (a) and (b)
D. neither (a) nor (b)
E. none the these.

Answer: Option C

Explanation:

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