1. ________ is an impure limestone.
a) Sandstone
b) Slate
c) Laterite
d) Kankar
Explanation: Kankar is a sedimentary rock that is impure in nature. It is used in road metal, manufacture of hydraulic line, etc. It is mostly found in north and Central part of India.
2. __________ is a metamorphic rock with compressive strength varies from 1.8 to 3.1 Newton per mm square.
a) Gneiss
b) Chalk
c) Murum
d) Laterite
Explanation: Laterite posses porous and spongy structure which can be easily quarried in blocks and contains high percentage of oxide of iron and also available in different colours. It is mostly used as building stone, Road metal, rough stone masonry work, etc.
3. ________ consist of carbonate of lime with specific gravity varies from 2 to 2.75 and compressive strength is 54 Newton per mm square.
a) Sandstone
b) Marble
c) Limestone
d) Slate
Explanation: Limestone is used in floors, steps, walls, Road metal, manufacturing of lime in blast furnace, etc. It is mostly found in Maharashtra, Rajasthan, Punjab, Gujarat, Madhya Pradesh and Uttar Pradesh.
4. _________ is a metamorphic rock with specific gravity about 2.65 and compressive strength is 71 Newton per mm square.
a) Marble
b) Quartz
c) Laterite
d) Slate
Explanation: Marble can take good polish and available in different colours. It is used in flooring, facing work, ornamental work, etc. It can easily be sawn and carved. It is mostly found in Rajasthan, Andhra Pradesh, Mysore, Madhya Pradesh and Uttar Pradesh.
5. ________ is a decomposed laterite which is deep brown or red in colour.
a) Quartzite
b) Murum
c) Slate
d) Sandstone
Explanation: Murum is a metamorphic rock. It is used in blindage from metal roads, for fancy paths and garden walls. It is mostly found in Bihar, Orissa, Mysore, Kerala, Andhra Pradesh and Madras.
6. ________ is a metamorphic rock which is hard, brother, crystalline and compact in nature.
a) Quartzite
b) Sandstone
c) Slate
d) Kankar
Explanation: Quartzite is hard and hence it is difficult to walk and dress. It is used in retaining walls, Road metals, concrete aggregate, pitching, rubble masonry, facing of buildings, etc. It is mostly found in Bengal, Himachal Pradesh, Uttar Pradesh, Gujarat, Punjab and Rajasthan.
7. _______ is a sedimentary rock with specific gravity varies from 2.65 to 2.95 and compressive strength is 64 Newton per mm square.
a) Limestone
b) Sandstone
c) Laterite
d) Kankar
Explanation: Sandstone consists of quartz and other minerals. It is easy to work and dress and also available in different colours. Its weight is about 20 to 22 kN per metre cube. It is used in steps, facing work, flooring, ornamental carving, etc.
8. __________ is a metamorphic rock with specific gravity about 2.89 and compressive strength varies from 75 to 207 Newton per mm square.
a) Quartzite
b) Murum
c) Marble
d) Slate
Explanation: Slate is non-absorbent, mostly in black colour and splits along natural bedding planes. It is used in damp proof courses, roofing work, sills, etc. Mostly found in Uttar Pradesh, Madhya Pradesh, Bihar, Madras and Mysore.
9. ______ type of ashlar masonry occupies an intermediate position between the rubble masonry and ashlar masonry.
a) Ashlar Chamfered masonry
b) Ashlar facing masonry
c) Ashlar block-in-course masonry
d) Ashlar rough tooled masonry
Explanation: In Ashlar block-in-course masonry, the faces of the stones are generally hammer dressed and the thickness of mortar joints does not exceed 6 mm. These type of construction is used for heavy Engineering Works such as a retaining walls, sea walls, etc. and in some cases is may be also adopted for public buildings.
10. In ______ rubble masonry the stones used are flints which are irregularly shaped nodules of silica.
a) Flint rubble masonry
b) Dry rubble masonry
c) Polygon rubble masonry
d) Random rubble masonry
Explanation: In Flint rubble masonry, the width and thickness vary from 80 mm to 150 mm and the length varies from 150 mm to 300 mm. The stones are extremely hard. But they are brittle and therefore they break easily. This type of masonry is used at places where the Flints are available readily and economically.