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21 . A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
A. axis of load
B. perpendicular to the axis of load
C. maximum moment of inertia
D. minimum moment of inertia

22 . The neutral axis of the cross-section a beam is that axis at which the bending stress is
A. zero B. minimum
C. maximum D. infinity

23 . Euler's formula holds good only for
A. short columns
B. long columns
C. both short and long columns
D. weak columns

24 . The object of caulking in a riveted joint is to make the joint
A. free from corrosion
B. stronger in tension
C. free from stresses
D. leak-proof

25 . A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce
A. no stress
B. shear stress
tensile stress
D. compressive stress