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
E. none of the above
Related Mcqs:
- Two coplanar couples having equal and op-posite moments_________________?
A. balance each other
B. produce a couple and an unbalanced force
C. are equivalent
D. produce a moment of couple
E. can not balance each other - According to principle of transmissibility of forces, the effect of a force upon a body is_______________?
A. maximum when it acts at the center 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
E. none of the above - The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?
A. forces
B. independence of forces
C. dependence of forces
D. balance of force
E. resolution of forces - D’ Alembert’s principle is used for___________________?
A. reducing the problem of kinetics to equivalent statics problem
B. determining stresses in the truss
C. stability of floating bodies
D. designing safe structures
E. solving kinematic problems - According to Lami’s theorem________________?
A. three forces acting at a point will be in equilibrium
B. three forces acting at a point can be represented by a triangle, each side being proportional to force
C. if three forces acting upon a particle are represented in magnitude and
direction by the sides of a triangle, taken in order, they will be in equilibrium
D. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
E. none of the above - According to law of triangle of forces______________?
A. three forces acting at a point will be in equilibrium
B. three forces acting at a point can be represented by a triangle, each side being proportional to force
C. if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
D. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
E. none of the above - The unit of force in S.I. units is_________________?
A. kilogram
B. newton
C. watt
D. dyne
E. joule - A framed structure is perfect if it contains members equal to________________?
A. 2n-3
B. n-l
C. ‘2n-l
D. n – 2
E. 3n-2where n = number of joints in a frame
- On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?
A. downwards at its upper end
B. upwards at its upper end
C. perpendicular to the wall at its upper end
D. zero at its upper end
E. none of the above - In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
A. W between P and F
B. F between W and P
C. P between W and F
D. W, P and F all on one side
E. none of the above
