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Q1. To obtain a very high strength concrete, use very fine grained
(A) Granite
(B) Magnetite
(C) Barite
(D) Volcanic scoria
Answer: (A) Granite
Q2. According to the recommendations of IS : 456-1978, the expansion joints
(A) Are provided where plane changes abruptly
(B) Are provided to ensure minimum resistance
(C) Do not carry reinforcement across them
(D) All the above
Answer: (D) All the above
Q3. Specified compressive strength of concrete is obtained from cube tests at the end of
(A) 3 days
(B) 7 days
(C) 21 days
(D) 28 days
Answer: (D) 28 days
Q4. Vicat apparatus is used for
(A) Fineness test
(B) Consistency test
(C) Test for setting time
(D) Test for tensile strength
Answer: (B) Consistency test
Q5. The impurity of mixing water which affects the setting time and strength of concrete, is
(A) Sodium sulphates
(B) Sodium chlorides
(C) Sodium carbonates and bicarbonates
(D) Calcium bicarbonates
Answer: (C) Sodium carbonates and bicarbonates
Q6. Pick up the incorrect statement from the following:
(A) Tricalcium silicate (C3S) hydrates rapidly
(B) Tricalcium silicate (C3S) generates more heat of hydration
(C) Tricalcium silicate (C3S) develops early strength
(D) Tricalcium silicate (C3S) has more resistance to sulphate attack
Answer: (D) Tricalcium silicate (C3S) has more resistance to sulphate attack
Q7. Which of the following losses of pre-stress occurs only in pre-tensioning and not in post-tensioning?
(A) Elastic shortening of concrete
(B) Shrinkage of concrete
(C) Creep of concrete
(D) Loss due to friction
Answer: (A) Elastic shortening of concrete
Q8. If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths of column strip and middle strip are
(A) 3.0 m and 1.5 m
(B) 1.5 m and 3.0 m
(C) 3.0 m and 3.0 m
(D) 1.5 m and 1.5 m
Answer:(C) 3.0 m and 3.0 m
Q9. If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be
(A) 0.35 d
(B) 0.40 d
(C) 0.45 d
(D) Dependent on grade of concrete also
Answer:(B) 0.40 d
Q10. The type of aggregates of same nominal size, which contain less voids when compacted, are
(A) Rounded spherical
(B) Irregular
(C) Flaky
(D) None of these
Answer: (A) Rounded spherical
Q11. Pick up the incorrect statement from the following:
(A) The bottom and top ends of slump mould are parallel to each other
(B) The axis of the mould is perpendicular to the end faces
(C) The internal surface of the mould is kept clean and free from set cement
(D) The mould is in the form of a frustum of hexagonal pyramid
Answer: (D) The mould is in the form of a frustum of hexagonal pyramid
Q12. A construction joint is provided where
(A) Bending moment is small
(B) Shear force is small
(C) The member is supported by other member
(D) All the above
Answer: (D) All the above
Q13. Pick up the correct statement from the following:
(A) Continuous grading is not necessary for obtaining a minimum of air voids
(B) The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve
(C) The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation
(D) All the above
Answer: (D) All the above
Q14. The concrete mix which causes difficulty in obtaining a smooth finish, possess
(A) Segregation
(B) Internal friction
(C) Hardness
(D) Bleeding
Answer: (C) Hardness
Q15. Sand generally contains salt if it is obtained from:
(A) Nala beds
(B) River beds
(C) Sea beds
(D) None of these
Answer: (C) Sea beds
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