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55.

In order to obtain the best workability of concrete, the preferred shape of aggregate is

A.	rounded	B.	elongated
C.	angular	D.	all of the above

56.

In prestressed concrete

A.	forces of tension and compression change but lever arm remains unchanged	B.	forces of tension and compressions remain unchanged but lever arm changes with the moment
C.	both forces of tension and compres-sion as well as lever arm change	D.	both forces of tension and compres-sion as well as lever arm remain unchanged

57.

In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

A.	100 mm	B.	150 mm
C.	200 mm	D.	250 mm

58.

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

A.	compressive and tensile	B.	tensile and compressive
C.	both compressive	D.	both tensile

59.

In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on

A.	the front face in one direction	B.	the front face in both directions
C.	the inner face in one direction	D.	the inner face in both directions

60.

In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

A.	10%	B.	20%
C.	30%	D.	40%

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