29. In long and short wall method of estimation, the length of long wall is the centre to centre distance between the walls and
A. breadth of the wall
B. half breadth of wall on each side
C. one fourth breadth of wall on each side
D. None of these.

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30. Referring of Fig. 23.1, pick up the correct statement from the following : 6.80 m
A. The total length of centre line of four walls is 20 m
B. Length of long wall out-to-out is 6.80 m
C. Length of short walls in-to-in is 3.20 m
D. All the above.

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31. If tensile stress of a steel rod of diameter D4s 1400 kg/cm2 and bond stress is 6 kg/cm2, the required bond length of the rod is
A.30 D
B. 40 D
C. 50 D
D. 59 D.

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32. Pick up the correct statement from the following :
A. The bent up bars at a support resist the negative bending moment
B. The bent up bars at a support resist the sharing force
C. The bending of bars near supports is generally at 45?
D. All the above.

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33. The total length of a cranked bar through a distance (d) at 45? in case of a beam of effective length L, is
A. L + 0.42 d
B. L + 2 x 0.42 d
C. L - 0.42 d
D. L - 2 x 0.4 d.

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34. While estimating a reinforced cement structure, the omitted cover of concrete is assumed
A. at the end of reminforcing bar, not less than 25 mm or twice the diameter of the bar
B. in thin slabs, 12 mm minimum or diameter of the bar whichever is more
C. for reinforcing longitudinal bar in a beam 25 mm minimum or diameter of the largest bar which is more
D. All the above.

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35. The damp proof course (D.P.C.) is measured in
A. Cub. m
B. Sq m
C. Metres
D. None of these.

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