If n is the ratio of internal and external diameters of a hollow shaft, the ratio of the weight of the hollow shaft and that of solid shaft of same strength, will be

The slenderness ratio of a vertical column of a square cross-section of 2.5 cm sides and 300 cm length, is

A triangular section having base b, height h, is placed with its base horizontal. If the shear stress at a depth y from top is q, the maximum shear stress is

The minimum number of rivets for the connection of a gusset plate, is

The shape of the bending moment diagram over the length of a beam, carrying a uniformly distributed load is always