- (A) balance each other
- (B) cannot balance each other
- (C) produce moment of a couple
- (D) are equivalent
- (E) none of the above
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- (A) nature of surfaces
- (B) area of contact
- (C) shape of the surfaces
- (D) ail of the above.
- (A) weight
- (B) velocity
- (C) acceleration
- (D) force
- (E) moment
- (A) the floor is smooth, the wall is rough
- (B) the floor is rough, the wall is smooth
- (C) the floor and wall both are smooth surfaces
- (D) the floor and wall both are rough surfaces
- (E) will be in equilibrium under all conditions
- (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
- (A) their total sum is zero
- (B) two resolved parts in two directions at right angles are equal
- (C) sum of resolved parts in any two per-pendicular directions are both zero
- (D) all of them are inclined equally
- (E) none of the above
- (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
- (A) coplanar force
- (B) non-coplanar forces
- (C) lever
- (D) moment
- (E) couple
- (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
- (A) proportional to normal load between the surfaces
- (B) dependent on the materials of contact surface
- (C) proportional to velocity of sliding
- (D) independent of the area of contact surfaces
- (E) none of the above is wrong statement
