21.A simply supported beam with rectangular cross-section is subjected to a central concentrated load. If the width and depth of the beam are doubled, then the deflection at the centre of the beam will be reduced to

22.Two beams, one of circular cross-section and other of square cross-section, have equal areas of cross-section. If subjected to bending

23.The effect of arching a beam is

24.Euler's formula for a mild steel long column hinged at both ends is not valid for slenderness ratio