Question  set 139

1. The unit of force in S.I. units is
A.Kilogram
B.Newton
C.Watt
D.Dyne

Answer  : B

2. The unit of work or energy in S.I. units is
A.Newton
B.Joule
C.Kilogram metre
D.Watt

Answer : B

3. The unit of power in S.I. units is
A.Newton metre
B.Watt
C.Joule
D.Kilogram-metre/sec

Answer: B

4. Forces are called concurrent when their lines of action meet in
A.One point
B.Two points
C.Plane
D.Perpendicular planes

Answer : A

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

Answer : B

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

Answer : D

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

Answer : D

8. Effect of a force on a body depends upon
A.Magnitude
B.Direction
C.Position or line of action
D.All of the above

Answer : D

9. If a number of forces act simultaneously on a particle, it is possible
A.Not a replace them by a single force
B.To replace them by a single force
C.To replace them by a single force through C.G.
D.To replace them by a couple

Answer :B

10. A force is completely defined when we specify
A.Magnitude
B.Direction
C.Point of application
D.All of the above

Answer:  D