1. The unit of force in S.I. units is

A.Kilogram

B.Newton

C.Watt

D.Dyne

2. The unit of work or energy in S.I. units is

A.Newton

B.Joule

C.Kilogram metre

D.Watt

3. The unit of power in S.I. units is

A.Newton metre

B.Watt

C.Joule

D.Kilogram-metre/sec

4. Forces are called concurrent when their lines of action meet in

A.One point

B.Two points

C.Plane

D.Perpendicular planes

5. Forces are called coplaner when all of them acting on body lie in

A.One point

B.One plane

C.Different planes

D.Perpendicular planes

6. A force acting on a body may

A.Introduce internal stresses

B.Retard its motion

C.Change its motion

D.All of the above

7. Which is the correct statement about law of polygon of forces?

A.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

B.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

C.If a polygon representing forces acting at a point is closed then forces are in equilibrium

D.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

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