Design of Concrete Structures Mcqs - Set 5

1)   Modulus of elasticity of steel as per IS : 456-1978 shall be taken as______________?

a. 20 kN/cm2
b. 200 kN/cm2
c. 200kN/mm2
d. 2xl06N/cm2
Answer  Explanation 

ANSWER: 200kN/mm2

Explanation:
No explanation is available for this question!


2)   If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section_______________?

a. depends on as, only
b. depends on aCbC only
c. depends on both crst and acbc
d. is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in c
Answer  Explanation 

ANSWER: depends on as, only

Explanation:
No explanation is available for this question!


3)   If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to__________________?

a. xv
b. xc
c. xv – TC
d. Tv + Tc
Answer  Explanation 

ANSWER: xv – TC

Explanation:
No explanation is available for this question!


4)   For a reinforced concrete section, the shape of shear stress diagram is_______________?

a. wholly parabolic
b. wholly rectangular
c. parabolic above neutral axis and rectangular below neutral axis
d. rectangular above neutral axis and parabolic below neutral axis
Answer  Explanation 

ANSWER: parabolic above neutral axis and rectangular below neutral axis

Explanation:
No explanation is available for this question!


5)   The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on______________?

a. top face perpendicular to wall
b. bottom face perpendicular to wall
c. both top and bottom faces perpendicular to wall
d. none of the above
Answer  Explanation 

ANSWER: top face perpendicular to wall

Explanation:
No explanation is available for this question!


6)   In counterfort retaining walls, the main reinforcement in the stem at support is_______________?

a. not provided
b. provided only on inner face
c. provided only on front face
d. provided both on inner and front faces
Answer  Explanation 

ANSWER: provided only on inner face

Explanation:
No explanation is available for this question!


7)   In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on_______________?

a. front face only
b. inner face only
c. both front face and inner face
d. none of the above
Answer  Explanation 

ANSWER: front face only

Explanation:
No explanation is available for this question!


8)   A T-shaped retaining wall mainly conssits of_________________?

a. one cantilever
b. two cantilevers
c. three cantilevers
d. four cantilevers
Answer  Explanation 

ANSWER: three cantilevers

Explanation:
No explanation is available for this question!


9)   To minimise the effect of differential settlement, the area of a footing should be designed for______________?

a. dead load only
b. dead load + live load
c. dead load + fraction of live load
d. live load + fraction of dead load
Answer  Explanation 

ANSWER: dead load + fraction of live load

Explanation:
No explanation is available for this question!


10)   In a pile of length /, the points of suspension from ends for lifting it are located at______________?

a. 0.207 1
b. 0.25 /
c. 0.293 /
d. 0.333 /
Answer  Explanation 

ANSWER: 0.207 1

Explanation:
No explanation is available for this question!


11)   While designing the pile as a column, the end conditions are nearly_______________?

a. both ends hinged
b. both ends fixed
c. one end fixed and other end hinged
d. one end fixed and other end free
Answer  Explanation 

ANSWER: one end fixed and other end hinged

Explanation:
No explanation is available for this question!


12)   The critical section for finding maximum bending moment for footing under masonry wall is located_______________?

a. at the middle of the wall
b. at the edge of the wall
c. halfway between the middle and edge of the wall
d. at a distance equal to effective depth of footing from the edge of the wall
Answer  Explanation 

ANSWER: halfway between the middle and edge of the wall

Explanation:
No explanation is available for this question!


13)   If the foundations of all the columns of a structure are designed on the total live and dead load basis, then_________________?

a. there will be no settlement of columns
b. there will be no differential settlement
c. the settlement of exterior columns will be more than interior columns
d. the settlement of interior columns will be more than exterior columns
Answer  Explanation 

ANSWER: the settlement of exterior columns will be more than interior columns

Explanation:
No explanation is available for this question!


14)   During erection, the pile of length / is supported by a crane at a distance of________________?

a. 0.207 /
b. 0.293 /
c. 0.7071
d. 0.793 /
Answer  Explanation 

ANSWER: 0.7071

Explanation:
from the driving end of pile which rests on the ground


15)   According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is__________________?

a. 0.43 d
b. 0.55 d
c. 0.68 d
d. 0.85 d
Answer  Explanation 

ANSWER: 0.43 d

Explanation:
No explanation is available for this question!


16)   The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of__________________?

a. 0.367 xu
b. 0.416 xu
c. 0.446 xu
d. 0.573 xu
Answer  Explanation 

ANSWER: 0.416 xu

Explanation:
where xu is the depth of neutral axis at the limit state of collapse


17)   The load factors for live load and dead load are taken respectively as_________________?

a. 1.5 and 2.2
b. 2.2 and 1.5
c. 1.5 and 1.5
d. 2.2 and 2.2
Answer  Explanation 

ANSWER: 2.2 and 1.5

Explanation:
No explanation is available for this question!


18)   According to Whitney’s theory, ultimate strain of concrete is assumed to be_____________?

a. 0.03%
b. 0.1%
c. 0.3%
d. 3%
Answer  Explanation 

ANSWER: 0.3%

Explanation:
No explanation is available for this question!


19)   Assertion A : The load factor for live load is greater than that for dead load. Reason R : The live loads are more uncertain than dead loads?
Select your answer based on the coding system given below :


a. Both A and R are true and R is the correct explanation of A.
b. Both A and R are true but R is not the correct explanation of A.
c. A is true but R is false.
d. A is false but R is true.
Answer  Explanation 

ANSWER: Both A and R are true and R is the correct explanation of A.

Explanation:
No explanation is available for this question!


20)   The design yield stress of steel according to IS: 456-1978 is_______________?

a. 0.37 fy
b. 0.57 fy
c. 0.67 fy
d. 0.87 fy
Answer  Explanation 

ANSWER: 0.87 fy

Explanation:
where fy is the characteristic yield strength of steel