This set of Construction and Building Materials Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Stone Masonry”.
Explanation: Random rubble masonry is the roughest and cheapest form of stone walling. In this type of masonry, the stone used are of widely different sizes. Larger stones are selected for quoins and Jambs to give increased strength and better appearance.
Explanation: In Polygon rubble masonry, the stones are hammer dressed and stones selected for face work are dressed in an irregular polygonal shape. Thus, the face joints are seen running in an irregular fashion in all directions.
Explanation: Ashlar facing masonry is provided along with brick or concrete block masonry, to give better appearance. The sides and Beds of each block are properly dressed so as to make them true to shape. The exposed faces of the stones are roughly tooled and chamfered.
Explanation: In Ashlar fine masonry, the beds, sides and faces are finely chiseled dressed. The stones are arranged in proper Bond and the thickness of mortar joint does not exceed 3 mm. This type of construction gives perfectly smooth appearance, but it is costly in construction.
Explanation: Ashlar Chamfered masonry is special form of Rock faced ashlar masonry in which the strip provided around the perimeter of the exposed face is chamfered or bevelled at an angle of 45° by means of a chisel to a depth of 25 mm. Due to this, a groove is formed in between adjacent blocks of stone.
6. ______ 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.
7. 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.
8. In _______ type of construction, the stones of irregular sizes are used.
a) Rubble masonry
b) Ashlar masonry
c) Brick masonry
d) Granite masonry
Explanation: In Rubble masonry, the stones, as obtained from quarry, are taken in use in the same form or they are broken and shaped in suitable sizes by means of hammer as the work proceeds. The strength of rubble masonry mainly depends on the quality of mortar and the use of long through Stone at frequent intervals.
9. In _______ masonry, the stones of irregular sizes and shapes are used which are arranged so as to have a good appearance.
a) Dry rubble masonry
b) Polygon rubble masonry
c) Random rubble masonry
d) Uncoursed rubble masonry
Explanation: In Random rubble masonry, the face stones are chisel addressed and the thickness of mortar joints does not exceed 6 mm. This type of masonry is used for the construction of residential buildings, compound walls, godowns, etc.
10. In _________ type of construction, the square or rectangular blocks of stones are used.
a) Brick masonry
b) Rubble masonry
c) Rock Masonry
d) Ashlar masonry
Explanation: In Ashlar masonry, the height of stone various from 250 mm to 300 mm. The length of stone should not exceed 3 times the height and the depth into the wall should be at least equal to half the height.
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