This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Stones – 1”.
1. Which of the following is not a classification of rocks from which building stones are obtained?
a) Geological classification
b) Biological classification
c) Physical classification
d) Chemical classification
Explanation: Rocks from which building stones are obtained are classified into three categories – geological classification, physical classification and chemical classification. According to geological classification, rocks are further divided into three categories – igneous rocks, sedimentary rocks and metamorphic rocks.
2. Dolerite is an example of ________ rock.
Explanation: Dolerite is an example of a hypabyssal rock. Hypabyssal rocks are types of igneous rocks which are formed due to colling of magma at comparatively shallow depth from the surface of the earth.
3. Which of the following is not a physical classification of rocks?
a) Stratified rocks
b) Unstratified rocks
c) Calcareous rocks
d) Foliated rocks
Explanation: According to physical classification, rocks are divided into three types. These are stratified rocks, unstratified rocks and foliated rocks. Physical classification of rocks is based on their general structure. Calcareous rock is a type of rock based on chemical classification.
4. In which of the following rocks, clay predominates?
a) Argillaceous rocks
b) Calcareous rocks
c) Silicious rocks
d) Volcanic rocks
Explanation: Clay predominates in argillaceous rocks. Slate is an example of this type of rock. In calcareous rocks, calcium carbonate predominates while in siliceous rocks, silica predominates.
5. Augite forms crystals of ________ shape.
Explanation: Augite is a mineral found in igneous rocks and resembles hornblende. Augite forms octagonal crystals and changes to chlorite by hydration.
6. The acid test used for testing building stones cannot be applied to limestones.
Explanation: Acid test used for testing building stones cannot be applied to limestones. It is generally carried out on sandstones.
7. Smith’s test is used to find out ____________
a) The toughness of a stone
b) Compressive strength of a stone
c) Presence of soluble material in a sample of stone
d) Rate of wear of stones
Explanation: Smith’s test is used to find out the presence of soluble material in a sample of stone. To find out the rate of wear of stones, the attrition test is used. Crushing test is used to find the compressive strength of a stone and impact test is used to find the toughness of the stone.
8. Crushing strength should be greater than ___________ for a good structural stone.
a) 10 kg per cm2
b) 100 kg per cm2
c) 1000 kg per cm2
d) 10,000 kg per cm2
Explanation: Crushing strength should be greater than 1000 kg per cm2 for a good structural stone. Crushing strength of basalt is as large as 1500 to 1900 kg per cm2 while that of limestone and sandstone is 550 and 650 kg per cm2 respectively.
9. Dolomite is a bicarbonate of _________ and ___________
a) Magnesium and aluminium
b) Calcium and aluminium
c) Magnesium and calcium
d) Sodium and aluminium
Explanation: Dolomite is a bicarbonate of magnesium and calcium. It is available in different shades and is insoluble in ordinary water.
10. For a stone to be used in road work, coefficient of hardness should be greater than ___________
Explanation: For a stone to be used in road work, coefficient of hardness should be greater than 17. The stone is said to be of medium hardness if the coefficient of hardness lies between 14 and 17. However, if the coefficient of hardness is less than 14, then the stone is said to be of poor hardness and therefore should not be used in road work.
11. In attrition test used to find the rate of wear of stones, wear should be equal to or less than ___________ for good building stone.
Explanation: In attrition test used to find the rate of wear of stones, wear should be equal to or less than 2 % for good building stone. If the wear is more than 3%, then the stone is not satisfactory.
12. Which of the following facts about gypsum is not correct?
a) It is hydrated sulphate of calcium
b) It has excellent solubility in water
c) It is white in the pure state
d) Its solubility in water is extremely poor
Explanation: Gypsum is hydrated sulphate of calcium. It is white in the pure state. Its solubility in water is extremely poor.
13. Quartz sand is an example of polymineralic rock while granite is an example of a monomineralic rock.
Explanation: Quartz sand is an example of monomineralic rock while granite is an example of a polymineralic rock. A monomineralic rock consists of only one mineral while a polymineralic rock consists of many minerals.
14. Which of the following is also called white mica?
Explanation: There are two forms of mica which commonly occur in igneous rocks. These are biotite and muscovite. Muscovite is also called white mica and biotite is also called black mica.
15. Basalt is an example of _________ rock.
Explanation: Basalt is an example of volcanic rock. These rocks are formed due to the pouring of magma and the surface of the earth. The cooling is very rapid and this type of rocks possess finely grained structure.
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