99.  A steel rod 1 metre long having square cross section is pulled under a tensile load of 8 tonnes. The extension in the rod was 1 mm only. If Esteel = 2 x 106 kg/cm2, the side of the rod, is
A. 1 cm
B. 1.5 cm
C. 2 cm
D. 2.5 cm.

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100. There are two hinged semicircular arches A, B and C of radii 5 m, 7.5 m and 10 m respectively and each carries a concentrated load W at their crowns. The horizontal thrust at their supports will be in the ratio of
A. 1 : 1 1/2 : 2
B. 2 : 1 1/2 : 1
C. 1 : 1 : 2
D. none of these.

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101. The horizontal thrust on the ends of a two hinged semicircular arch of radius R carrying
A. a uniformly distributed load w per unit run over its right half span, is
B. a uniformly distributed load w per unit run over its entire span is ?4
C. a distributed load varying from zero at the left end to w per unit horizontal run at the right end, is ?2 ?wR
D. all the above.

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102. A two hinged parabolic arch of span 1 and rise h carries a load varying from zero at the left end to w per unit run at the right end. The horizontal thrust is
A. 50 t
B. 75 t
C. 100 t
D. 125 t

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103. The locus of reaction of a two hinged semi-circular arch, is
A. straight line
B. parabola
C. circle
D. hyperbola.

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104.  In plastic analysis, the shape factor for rectangular section, is
A.1.4
B.1.5
C.1.6
D. 1.7.

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105.  In plastic analysis, the shape factor for a triangular section, is
A.1.5
B.1.34
C.2.34
D. 2.5.

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