design of concrete structures Mcqs
101. The main reinforcement in the toe of a T- shaped R C. retaining wall is provided on_______________?
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A. ="color: #003f1a;">1. top face parallel to the wall

B. correct answer is ?

C. e="color: #003f1a;">2. top face perpendicular to the wall
D. e="color: #003f1a;">4. bottom face perpendicular to the wall
E. e="color: #003f1a;">3. bottom face paralleUo the wall
102. In a ring beam subjected to uniformly distributed load______________?
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A. e="color: #003f1a;">4. torsion at mid span is maximum

B. correct answer is ?

C. e="color: #003f1a;">3. torsion at mid span is zero
D. e="color: #003f1a;">2. shear force at mid span is maximum
E. ="color: #003f1a;">1. shear force at mid span is zero
103. The recommended value of modular ratio for reinforced brick work is______________?
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A. 40

B. 30

C. 18

D. 58

104. Select the correct statement?
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A. High tensile steel is cheaper than mild steel

B. Elastic modulus of high tensile steel is more than that of mild steel

C. Elastic modulus of high tensile steel is nearly the same as that of mild steel

D. Carbon percentage in high carbon steel is less than that in mild steel

105. Select the correct statement?
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A. Elastic modulus of high tensile steel is nearly the same as that of mild steel

B. High tensile steel is cheaper than mild steel

C. Elastic modulus of high tensile steel is more than that of mild steel

D. Carbon percentage in high carbon steel is less than that in mild steel

106. The design yield stress of steel according to IS: 456-1978 is_______________?
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A. 0.87 fy

B. 0.57 fy

C. 0.37 fy

D. 0.67 fy

107. 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?
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A. ect your answer based on the coding system given below :

108. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of__________________?
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A. 0.367 xu

B. 0.573 xu

C. 0.416 xu

D. 0.446 xu

109. The load factors for live load and dead load are taken respectively as_________________?
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A. 2.2 and 1.5

B. 2.2 and 2.2

C. 1.5 and 2.2

D. 1.5 and 1.5

110. High carbon content in the steel causes_______________?
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A. decrease in tensile strength but increase in ductility

B. increase in tensile strength but decrease in ductility

C. decrease in both tensile strength and ductility

D. increase in both tensile strength and ductility

111. As per Whitneys theory, the maximum moment of resistance of the balanced section of a beam of width b and effective depth d is given by_______________?
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A. 0.43acybd2

B. ^acybd2

C. 0.185acybd2

D. re acy is the cylinder compressive strength of concrete

E. ^acybd2

112. According to Whitneys theory, ultimate strain of concrete is assumed to be_____________?
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A. 3%

B. 0.3%

C. 0.03%

D. 0.10%

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

114. The depth of footing for an isolated column is governed by______________?
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A. pan style="color: #003f1a;">2. shear force
B. an style="color: #003f1a;">1. maximum bending moment
C. pan style="color: #003f1a;">3. punching shear

D. correct answer is?

115. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always________________?
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A. zero

B. tensile

C. compressive

D. tensile or compressive

116. Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?
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A. elastic shortening of concrete

B. loss due to friction

C. creep of concrete

D. shrinkage of concrete

117. A beam curved in plan is designed for_______________?
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A. bending moment and torsion

B. shear and torsion

C. bending moment and shear

D. bending moment, shear and torsion
118. The effect of adding calcium chloride in concrete is________________?
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A. e="color: #003f1a;">2. to decrease shrinkage

B. (1) and (3)

C. (2)and (4)

D. ="color: #003f1a;">1. to increase shrinkage

E. correct answer is?

F. e="color: #003f1a;">4. to decrease setting time
119. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then_________________?
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A. the settlement of exterior columns will be more than interior columns

B. there will be no differential settlement

C. there will be no settlement of columns

D. the settlement of interior columns will be more than exterior columns

120. Shrinkage of concrete depends upon_____________?
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A. pan style="color: #003f1a;">2. passage of time
B. an style="color: #003f1a;">1. humidity of atmosphere

C. correct answer is?

D. pan style="color: #003f1a;">3. stress
121. Stress strain curve of high tensile steel_______________?
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A. does not show definite yield point but yield point is defined by 2% proof stress

B. does not show definite yield point but yield point is defined by 0.1% proof stress

C. has a definite yield point

D. does not show definite yield point but yield point is defined by 0.2% proof stress
122. Which of the following has high tensile strength ?
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A. heat treated rolled wires

B. plain hot rolled wires

C. cold drawn wires

D. all have same tensile strength

123. According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is__________________?
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A. 0.55 d

B. 0.43 d

C. 0.68 d

D. 0.85 d

124. Select the incorrect statement?
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A. For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system

B. none of the above

C. Pretensioning system has greater certainty about its durability.

D. The loss of prestress is more in pre-tensioning system than in post-tensioning system.

125. Examine the following statements ___________?
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A. pan style="color: #003f1a;">4. Factor of safety for concrete should be based on its ultimate stress.
B. pan style="color: #003f1a;">2. Factor of safety for steel should be based on its ultimate stress,
C. pan style="color: #003f1a;">3. Factor of safety for concrete should be based on its yield stress,
D. an style="color: #003f1a;">1. Factor of safety for steel should be based on its yield stress,

E. correct statements are

126. The critical section for finding maximum bending moment for footing under masonry wall is located_______________?
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A. halfway between the middle and edge of the wall

B. at the edge of the wall

C. at the middle of the wall

D. at a distance equal to effective depth of footing from the edge of the wall

127. According to Whitneys theory, depth of stress block for a balanced section of a concrete beam is limited to_______________?
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A. 0.85 d

B. 0.68 d

C. 0.537 d

D. 0.43 d

128. The purpose of reinforcement in prestressed concrete is________________?
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A. all of the above

B. to impart initial compressive stress in concrete

C. to resist tensile stresses

D. to provide adequate bond stress

129. Ultimate strength of cold drawn high steel wires_______________?
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A. increases with increase in diameter of bar

B. does not depend on diameter of bar

C. decreases with increase in diameter of bar

D. none of the above

130. Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?
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A. 35 MPa and 42 MPa

B. 42 MPa and 53 MPa

C. 42 MPa and 35 MPa

D. 53 MPa and 42 MPa

131. Most common method of prestressing used for factory production is________________?
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A. Lee-Macall system

B. Magnel-Blaton system

C. Freyssinet system

D. Long line method
132. Prestress loss due to friction occurs________________?
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A. only in post-tensioned beams

B. only in pretensioned beams

C. in both post-tensioned and preten-sioned beams

D. none of the above

133. In a spherical dome the hoop stress due to a concentrated load at crown is_______________?
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A. compressive everywhere

B. partly compressive and partly tensile

C. tensile everywhere

D. zero

134. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively_______________?
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A. compressive and tensile

B. tensile and compressive

C. both compressive

D. both tensile

135. Select the incorrect statement?
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A. Bleeding can be minimized by adding pozzuolana finer aggregate

B. Bleeding can be increased by addition of calcium chloride

C. none of the above

D. Lean mixes bleed more as compared to rich ones

136. In counterfort type retaining walls_____________?
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A. e="color: #003f1a;">2. the heel slab is designed as a continuous slab
B. e="color: #003f1a;">4. the heel slab is designed as a cantilever

C. correct answer is?

D. e="color: #003f1a;">3. the vertical slab is designed as a cantilever
E. ="color: #003f1a;">1. the vertical slab is designed as a continuous slab
137. In a counterfort retaining wall, the main reinforcement is provided on the_______________?
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A. e="color: #003f1a;">4. inclined face in back counterEort

B. correct answer is

C. e="color: #003f1a;">3. bottom face in back counterfort
D. e="color: #003f1a;">2. inclined face in front counterfort
E. ="color: #003f1a;">1. bottom face in front counterfort