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Engineering :: Building Materials


41.  The attrition test on stones is performed
A. to determine the crushing strength of the stone B. for assessing the resistance of stone to the sun, rain, wind etc.
C. for ascertain the stability of the stone when exposed to acid fumes D. for determining the rate of wear of stone due to grinding action under traffic

42.  The stone used for the construction of curved or ornamental work should be soft.
A. Right B. Wrong

43.  A first class brick should not absorb water more than
A. 10% B. 15%
C. 20% D. 25%

44.  The brick earth is derived by the disintegration of
A. igneous B. metamorphic

45.  The principal constituent of every kind of brick earth is alumina.
A. True B. False

46.  A first class brick should have a minimum crushing strength of
A. 7 MN/m2 B. 10.5 MN/m2
C. 12.5 MN/m2 D. 14 MN/m2

47.  The percentage of alumina in a good brick clay should vary from
A. 20 to 30% B. 30 to 40%
C. 40 to 50% D. 50 to 60%

48.  The percentage of silica in a good brick clay should vary from
A. 20 to 30% B. 30 to 40%
C. 40 to 50% D. 50 to 60%

49.  Excess pf alumina in the clay
A. makes the brick brittle and weak B. makes the brick crack and warp on drying
C. changes colour of the brick from red to yellow D. improves impermeability and durability of the brick

50.  Excess of silica in the clay
A. makes the brick brittle and weak B. makes the brick crack and wrap on drying
C. changes the colour of the brick from red to yellow D. improves impermeability and durability of the brick




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