Engineering Mechanics Multiple Choice Questions And Answers for download free pdf

10.1. The unit of force in S.I. units is
(a) kilogram
(b) newton
(c) watt
(d) dyne
(e) joule.

Ans: b

10.2. The unit of work or energy in S.I. units is
(a) newton
(b) pascal
(c) kilogram metre
(d) watt
(e) joule.

Ans: e

10.3. The unit of power in S.I. units is
(a) newton metre
(b) watt
(c) joule
(d) kilogram metre/sec.
(e) pascal per sec.

Ans: b

10.4. Forces are called concurrent when their lines of action meet in
(a) one point      
(b) two points
(c) plane
(d) perpendicular planes
(e) different planes.
Ans: a

10.5. Forces are called coplanar when all of them acting on body lie in
(a) one point      
(b) one plane
(c) different planes
(d) perpendicular planes
(e) different points.
Ans: b

10.6. A force acting on a body may
(a) introduce internal stresses
(b) balance the other forces acting on it
(c) retard its motion
(d) change its motion
(e) all of the above.
Ans: e

10.7. 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 equi¬librium
(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
(e) none of the above.
Ans: d

10.8. Effect of a force on a body depends upon
(a) magnitude
(b) direction
(c) position or line of action
(d) all of the above
(e) none of the above.
Ans: d

10.9. 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
(e) to replace them by a couple and a force.
Ans: b

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