5.

76.

77.

78.

79.

80.

81.

82.

88.

Counter fort retaining wall is economieal for heights above m:

@ 2 ®) 4
(© 5 യ 7
For preliminary ealculations the thickness வீ the base slab of a retaining wall may be
taken as percent of the height of wall:
(A) 0.8 (B) .08
(© 8 D) 80

Considering the concept of durability of water tanks, the minimum grade of conerete
shall be:

ಯ) 0 (B) M20

2) 0 (D) M40

The permissible concrete stress in direct tension of M20 in calculation relating ‏م‎
‎resistance to cracking as per IS 3370-1965 part 1115:

(^) 20kg/em?® (3) 12kg/em?®

(¢) 14kglem® യ) 17kglem?

The permissible concrete stress in tension due ‏ما‎ bending ‏له‎ M20 in calculation
relating to resistance to cracking as per IS 3370-1965 part II is:

(^) 20kg/em® (B) 17kglem®

(¢) 14kg/em?® (D) 10kg/em?®

The method of prestressing conerete in which pre-stressing steel is tensioned against
the hardened concrete is:

(^) Pre tensioning (B) post tensioning

(C) initial prestressing (D) jack tensioning

A normally consolidated clay settled 10 mm when effective stress was increased from
50 kKN/m? to 100 kN/m”. If the effective stress is further increased from 100 kN/m? to
200 kN/m?, then further settlement of the clay shall be:

(A) 10 mm (B) 20 mm

(2) 80 mm (D) 40 mm

The time taken by clay layer to achieve 50% consolidation is 5 years. If the layer was
half as thiek, 5 times more permeable and 4 times more compressible then the time
that would be required to achieve the same degree of consolidation is :

(^) 12 year (B) 5 year

(C) 1year (D) 16 year

A soil sample has a shrinkage limit of 10% and specific gravity of soil solids as 2.7.
The porosity of the soil at shrinkage limit is :

A) 21.2% ൫ 80%

©) 527% 0) 70%

013/2020 18 A