71. The equivalent length of a column fixed at one end and free at the other end, is
A. 0.5 1
B. 0.7 1
C.1 1
D. 2 1

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72. The slenderness ratio of a vertical column of a square cross-section of 2.5 cm sides and 300 cm length, is
A.200
B.240
C.360
D.416

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73.  The slenderness ratio of a vertical column of square cross- section of 10 cm side and 500 cm long, is
A.117.2
B.17.3
C.173.2
D.137.2

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74.  The range within which a load can be applied on a rectangular column, to avoid any tensile stress, is
A. one-half of the base
B. one-fifth of the base
C. one-fourth of the base
D. one-fifth of the base

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75. For keeping the stress wholly compressive the load may be applied on a circular column anywhere within a concentric circle of diameter
A. d/2
B. d13
C. d14
D. d18

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76. To ascertain the maximum permissible eccentricity of loads on circular columns, the rule generally followed, is
A. middle half rule of columns ,
B. middle third rule of columns
C. middle fourth rule of columns
D. none of these.

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77.  A short masonry pillar is 60 cm x 60 cm in cross-section, the core of the pillar is a squai, whose side is
A. 17.32 cm
B. 14.14 cm
C. 20.00 cm
D. 22.36 cm

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