511. The property by virtue of which lime sets under water, is known as
A. slacking
B. setting
C. hydraulicity
D. calcining.

512. For construction of structures under water, the type of lime used, is
A. hydraulic lime
B. fat lime
C. quick lime
D. pure lime

513. Pozzolana (or surkhi) is used in lime
A. to impart hydraulicity
B. to prevent shrinkage
C. to decrease the cost of construction
D. to decrease the setting time.

514. Slacking of lime is affected by
A. keeping it exposed to air
B. immersing the lime in water
C. crushing the lime lumps
D. none of these.

515. Lime mortar is generally made with
A. quick lime
B. fat lime
C. hydraulic lime
D. plain lime

516. The commonly used lime in white-washing, is
A. white lime
B. fat lime
C. hydraulic lime
D. lime

517. Lime concrete is generally used for
A. wall foundations
B. flooring at ground level
C. both (a) and (b)
D. neither (a) nor (b).

518. Lime putty
A. is made from hydraulic lime
B. is made by adding lime to water
C. can be used only upto three days
D. all of above.

519. The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is
A.20
B.15
C.10
D.0

520. The initial setting time of hydraulic lime, is
A. 30 minutes
B. 60 minutes
C. 90 minutes
D. 120 minutes

NOTE
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