Civil Engineering - Building Materials

26. 

The normal curing period for lime mortar, is:

A. one day
B. 3 days
C. 7 days
D. 10 days
E. 14 days.

Answer: Option C

Explanation:

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27. 

The type of steel used for precision levelling staff, is

A. Titanium steel
B. Carbon steel
C. Invar
D. Stainless steel.

Answer: Option C

Explanation:

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28. 

During pudding

A. molten metal is kept clear of the fuel
B. carbon is converted into carbonic acid gas
C. silicon forms a slag
D. metal is heated by the burning of gases
E. all the above.

Answer: Option E

Explanation:

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29. 

German silver is an alloy of

A. zinc, lead and nickel
B. silver, gold and lead
C. copper, nickel and zinc
D. copper, brass and zinc
E. brass, silver and zinc.

Answer: Option C

Explanation:

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30. 

Pick up the incorrect statement from the following:

A. Plastics are chemical resistant
B. Plastics are durable
C. Plastics are ductile
D. Plastics are excellent electric insulators.

Answer: Option C

Explanation:

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