171. The main function of alumina in brick earth is_______________?
A. to impart plasticity
B. to make the brick durable
C. to prevent shrinkage
D. to make the brick impermeable
✅ The correct answer is option A.
Civil Engineering
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172. The predominant constituent which is responsible for strength in granite is_____________?
A. quartz
B. feldspar
C. mica
D. none of the above
✅ The correct answer is option A.
173. Which of the following metamorphic rocks has the most weather resisting characteristics ?
A. marble
B. quartzite
C. slate
D. lime stone
✅ The correct answer is option B.
174. The slump recommended for mass concrete is about_______________?
A. 25 mm to 50 mm
B. 50 mm to 100 mm
C. 100 mm to 125 mm
D. 125 mm to 150 mm
✅ The correct answer is option A.
175. The main ingredients of Portland cement are________________?
A. lime and silica
B. lime and alumina
C. silica and alumina
D. lime and iron
✅ The correct answer is option A.
176. 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
✅ The correct answer is option B.
177. The horizontal timber piece provided at the apex of a roof truss which supports the common rafter is called______________?
A. ridge board
B. hip rafter
C. eaves board
D. valley rafter
✅ The correct answer is option A.
178. The basic purpose of a retarder in concrete is_____________?
A. to increase the initial setting time of cement paste in concrete
B. to decrease the initial setting time of cement paste in concrete
C. to render the concrete more water tight
D. to improve the workability of concrete mix
✅ The correct answer is option A.
179. 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
✅ The correct answer is option B.
180. For testing compressive strength of cement, the size of cube used is_______________?
A. 50 mm
B. 70.6 mm
C. 100 mm
D. 150 mm
✅ The correct answer is option A.