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Civil Engineering Objective Questions { Applied Mechanics }

36. From a circular plate of a diameter 6 cm is cut out a circle whose diameter is equal to the radius of the plate. The C.G. of the remainder from the centre of circular plate is at a distance of
A. 2.0 cm
B.(h) 1.5 cm
D. 0.5 cm.

37. The units of moment of inertia of an area, are
A. kg/m
B.((b kg/m2
C. m4
D. kg-m2.

38. The units of inertia of mass, are
A. kg/m
B. kg/m2
C. m4
D. kg-m2.

39. If a spherical body is symmetrical about its perpendicular axes, the moment of inertia of the body about an axis passing through its centre of gravity as given by Routh's rule is obtained by dividing the product of the mass and the sum of the squares of two semi-axes by n where n is
A.(a ) 2

40. Moment of interia of a squares of side b about an axis through its centre of gravity, is
A. b3 / 4
C. b4/3
D. b4/8

41. The moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter is 6 cm, about centroidal axis, is
A. 437.5 cm4
B. 337.5 cm4
C. 237.5 cm4
D. 137.5 cm4

42. M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is
A. TC (D4 4_ d4) 64
B.(c) rt (D4 + d4) 32

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