51) 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) to 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

52) The stone used for the construction of curved or ornamental work should be soft.

• (a) Right
• (b) Wrong

53) Arrange the following building materials in the increasing order of density of materials Granite, Steel, River sand, Water

• (a) Water, River sand, Steel, Granite
• (b) River sand, Granite, Water, Steel
• (c) Water, River sand, Granite, Steel
• (d) River sand, Water, Granite, Steel

54) A first class brick should not absorb water more than ................. of its own dry weight after 24 hours immersion in cold water.

• (a) 10%
• (b) 15%
• (c) 20%
• (d) 25%

55) The brick earth is derived by the disintegration of ................. rocks.

• (a) igneous
• (b) metamorphic