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31.

If three coplaner forces acting on a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Right

Wrong

32.

According to lami's theorem

A.	the three forces must be equal	B.	the three forces must be at 120? to each other
C.	the three forces must be in equilibrium	D.	if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

33.

If a given force (or a given system of forces) acting on a body

change

does not change

34.

If three forces acting at a point are represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are in equilibrium

Yes

35.

If a number of forces acting at a point be represented in magnidude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium

Agree

Disagree

36.

The moment of a force

A.	is the turning effect produced by a force, on the body, on which it acts	B.	is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
C.	is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken	D.	all of the above

37.

If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be

A.	equal to	B.	less than
C.	greater than

38.

Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then

A.	their algebraic sum is zero	B.	their lines of action are at equal distances
C.	the algebraic sum of their moments about any point in their plane is zero	D.	the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

39.

According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then

A.	their algebraic sum is zero	B.	their lines of action are at equal distances
C.	the algebraic sum of their moments about any point in their plane is zero	D.	the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

40.

For any system of coplaner forces, the condition of equilibrium is that the

A.	algebraic sum of the horizontal components of all the forces should be zero	B.	algebraic sum of the vertical components of all the forces should be zero
C.	algebraic sum of moments of all the forces about any point should be zero	D.	all of the above