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

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

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

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

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

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.

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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