Pick up the incorrect statement from the following ?

A. The C.G. of a circle is at its center
B. The C.G. of a triangle is at the intersection of its medians
C. The C.G. of a rectangle is at the inter-section of its diagonals
D. The C.G. of a semicircle is at a distance of r/2 from the center
E. The C-G. of an ellipse is at its center

Which one of the following statements is not correct_________________?

A. the tangent of the angle of friction is equal to coefficient of friction
B. the angle of repose is equal to angle of friction
C. the tangent of the angle of repose is equal to coefficient of friction
D. the sine of the angle of repose is equal to coefficient to friction
E. none of the above

The weight of a body is due to ___________________?

A. centripetal force of earth
B. gravitational pull exerted by the earth
C. forces experienced by body in atmosphere
D. force of attraction experienced by particles
E. gravitational force of attraction towards the center of the earth

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