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1) Crushing strength of a first class brick should not be less than_____________? a. 3.5 N/mm2 b. 7.0 N/mm2 c. 10.5 N/mm2 d. 14.0 N/mm2
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2) The age of a tree can be known by examining_________________? a. cambium layer b. annular rings c. medullary rays d. heart wood
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3) Excess of alumina in brick earth makes the brick______________? a. impermeable b. brittle and weak c. to lose cohesion d. to crack and warp on drying
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4) Percentage of silica in a good brick earth lies between_______________? a. 5 to 10% b. 20 to 30% c. 50 to 60% d. 70 to 80%
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5) The percentage of alumina in a good brick earth lies between________________? a. 5 to 10% b. 20 to 30% c. 50 to 60% d. 70 to 80%
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6) The nominal size of the modular brick is_______________? a. 190 mm x 90mmx 80 mm b. 190 mm x 190 mm x 90 mm c. 200 mm x 100 mm x 100 mm d. 200 mm x 200 mm x 100 mm
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7) Excess of silica in brick earth results in______________? a. cracking and warping of bricks b. loss of cohesion c. enhancing the impermeability of bricks d. none of the above
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8) Which of the following ingredients of the brick earth enables the brick to retain its shape ? a. alumina b. silica c. iron d. magnesia
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9) The process of mixing clay, water and other ingredients to make brick is known as______________? a. kneading b. moulding c. pugging d. drying
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10) The internal size of mould used in brick preparation is__________________? a. equal to the size of a fully burnt brick b. smaller than the size of a fully burnt brick c. greater than the size of a fully burnt brick d. none of the above
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11) Which of the following bricks are used for lining of furnaces ? a. overburnt bricks b. underburnt bricks c. refractory bricks d. first class bricks
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12) Pug mill is used for_______________? a. preparation of clay b. moulding of clay c. drying of bricks d. burning of bricks
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13) 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
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14) 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
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15) 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
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16) Number of bricks required for one cubic metre of brick masonry is____________? a. 400 b. 450 c. 500 d. 550
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17) Quick lime is_______________? a. calcium carbonate b. calcium oxide c. calcium hydroxide d. none of the above
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18) 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)
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19) Glazing is used to make earthenware______________? a. hard b. soft c. porous d. impervious
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20) 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
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