246. A rock contains only one mineral. It is called
A. homogeneous
B. non-homogeneous
C. monomineralic
D. polymineralic.

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247. Pick up the monomineralic rock from the following :
A. Quartz sand
B. Pure gypsum
C. Magnesite
D. Granite

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248. Pick up the correct characteristic of Pyroxene from the following :
A. It forms octagonal crystals
B. It converts to chlorine by hydration
C. Its density is 2.3 to 3.6 g/cm2
D. All the above.

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249. Chlorite, a green colour mineral is mainly derived from the decomposition of
A. augite
B. biotite
C. horn blende
D. All of these.

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250. 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.

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251. Pick up the correct statement from the following :
A. In stone arches, the stones are placed with their natural beds radial
B. In cornices, the stones are placed with their natural beds as vertical
C. In stone walls, the stones are placed with their natural beds as horizontal
D. All the above.

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252. Pick up the correct statement from the following :
A. Acid test is done to find out the weathering quality of stones
B. Attrition test is done to find out the rate of wear of stones which are used in road construction
C. Crushing test is done to find out the compressive strength of the stone
D. All the above.

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