## Engineering Mechanics The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then

None of the listed here
Q = 2R
P = Q
Q = R

## Engineering Mechanics The bodies which rebound after impact are called

Inelastic bodies
None of these
Elastic bodies
Neither elastic nor inelastic bodies

## Engineering Mechanics Coefficient of friction depends upon

Area of contact only
Both (A) and (B)
None of these
Nature of surface only

Halved
Doubled
None of these

## Engineering Mechanics Which is the correct statement about law of polygon of forces?

If a polygon representing forces acting at a point is closed then forces are in equilibrium
If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

## Engineering Mechanics A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Upward at its upper end
Towards the wall at its upper end
Away from the wall at its upper end
Downward at its upper end