Civil Engineering - Building Materials

21. 

Pick up the correct statement from the following:

A. Horn blende mineral is brittle
B. Muscovite is also known as white mica and potashmica
C. Biotite is also known as blackmica
D. All the above.

Answer: Option D

Explanation:

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22. 

The rocks which are formed due to cooling of magma at a relatively shallow depth from the earth's surface are called

A. Plutonic rocks
B. Hypabyssal rocks
C. Volcanic rocks
D. Ignoeous rocks.

Answer: Option B

Explanation:

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23. 

The base material for distemper, is

A. chalk
B. lime
C. lime putty
D. cement wash.

Answer: Option A

Explanation:

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24. 

The thermosetting plastic

A. becomes rigid when moulded at suitable pressure and temperature
B. at 127°C to 177°C permanently set and further application of heat does not soften it
C. charrs at 343°C
D. All the above.

Answer: Option D

Explanation:

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25. 

Pick up the synthetic resin from the following:

A. Malamine resin
B. Phenolic resin
C. Resorcinol resin
D. Urea resin
E. All of these.

Answer: Option E

Explanation:

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