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61. Number of bricks required for one cubic metre of brick masonry is____________?

A. 400
B. 450
C. 500
D. 550

62. Quick lime is_______________?

A. calcium carbonate
B. calcium oxide
C. calcium hydroxide
D. none of the above

63. Quick lime is (1) slow in setting (2) rapid in slacking (3) good in strength The correct answer is____________?

A. only (1)
B. only (2)
C. both (1) and (2)
D. both (2) and (3)

64. Glazing is used to make earthenware______________?

A. hard
B. soft
C. porous
D. impervious

65. Hydraulic lime is obtained by_______________?

A. burning of lime stone
B. burning of kankar
C. adding water to quick lime
D. calcination of pure clay

66. The main ingredients of Portland cement are________________?

A. lime and silica
B. lime and alumina
C. silica and alumina
D. lime and iron

67. Le Chatelier’s device is used for determining the_______________?

A. setting time of cement
B. soundness of cement
C. tensile strength of cement
D. compressive strength of cement

68. Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth ?

A. lime stone and alumina
B. silica and alkalies
C. alumina and iron
D. alkalies and magnesium

69. The frog of the brick in a brick masonry is generally kept on______________?

A. bottom face
B. top face
C. shorter side
D. longer side

70. Advantage of a clamp compared to a kiln for burning bricks is that_______________?

A. it takes less time for burning
B. it gives more output of first class bricks
C. it has less initial cost
D. it is suitable when bricks are required in large numbers