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13.

According to principle of moments

A.	if a system of coplanar forces is in equilibrium, then their algebraic sum is zero	B.	if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
C.	the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point	D.	positive and negative couples can be balanced

14.

According to principle of transmissibility of forces, the effect of a force upon a body is

A.	maximum when it acts at the centre of gravity of a body	B.	different at different points in its line of action
C.	the same at every point in its line of action	D.	minimum when it acts at the C.G. of the body

15.

Angle oT friction is the

A.	angle between normal reaction and the resultant of normal reaction and the limiting friction	B.	ratio of limiting friction and normal reaction
C.	the ratio of minimum friction force to the friction force acting when the body is just about to move	D.	the ratio of minimum friction force to friction force acting when the body is in motion

16.

Centre of gravity of a solid cone lies on the axis at the height

A.	one-fourth of the total height above base	B.	one-third of the total height above base
C.	one-half of the total height above base	D.	three-eighth of the total height above the base

17.

Centre of gravity of a thin hollow cone lies on the axis at a height of

A.	one-fourth of the total height above base	B.	one-third of the total height above base
C.	one-half of the total height above base	D.	three-eighth of the total height above the base

18.

Centre of percussion is

A.	the point of C.G.	B.	the point of metacentre
C.	the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis	D.	point of suspension

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