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engineering mechanics MCQs

Practise focused engineering mechanics questions with marked answers for exam preparation and subject revision.

engineering mechanics Mcqs

1. If three forces acting in different planes can be represented by a triangle, these will be in________________?
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A. unpredictable

B. full equilibrium

C. partial equilibrium

D. none of the above

E. non-equilibrium

2. According to principle of moments__________________?
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A. positive and negative couples can be balanced

B. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

C. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

D. none of the above

E. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

3. Friction force for dry surfaces. Friction force is________________?
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A. k up wrong statement?

B. proportional to normal load between the surfaces

C. none of the above is wrong statement

D. independent of the area of contact surfaces

E. dependent on the materials of contact surface

F. proportional to velocity of sliding

4. In ideal machines__________________?
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A. none of the above

B. mechanical advantage is unity

C. mechanical advantage is equal to velocity ratio

D. mechanical advantage is greater than velocity ratio

E. mechanical advantage is less than velocity ratio

5. The unit of force in S.I. units is________________?
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A. watt

B. dyne

C. newton

D. joule

E. kilogram

6. The necessary condition for forces to be in equilibrium is that these should be_________________?
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A. coplanar

B. meet at one point ;

C. both A. and B. above

D. all be equal

E. something else

7. The unit of work or energy in S.I. units is_______________?
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A. pascal

B. kilogram meter

C. newton

D. watt

E. joule

8. A number of forces acting at a point will be in equilibrium if_____________________?
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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

9. According to principle of transmissibility of forces, the effect of a force upon a body is_________________?
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A. maximum when it acts at the center of gravity of a body

B. minimum when it acts at the C.G. of the body

C. the same at every point in its line of action

D. different at different points in its line of action

E. none of the above

10. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one___________________?
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A. parabola

B. hyperbola

C. circle

D. ellipse

E. none of the above

11. The product of either force of couple with the arm of the couple is called_________________?
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A. resulting couple

B. none of the above

C. moment of the couple

D. moment of the forces

E. resultant couple

12. The units of moment of inertia of an area are__________________?
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A. kg m2

B. kg/m4

C. kg/m2

D. m4

E. m3

13. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to___________________?
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A. 500

B. 50

C. 250

D. 25

E. 100

14. D Alemberts principle is used for______________________?
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A. determining stresses in the truss

B. reducing the problem of kinetics to equivalent statics problem

C. designing safe structures

D. stability of floating bodies

E. solving kinematic problems

15. Coefficient of friction is the_________________?
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A. angle between normal reaction and the resultant of normal reaction and the limiting friction

B. tangent of angle of repose

C. the friction force acting when the body is in motion

D. ratio of limiting friction and normal reaction

E. the friction force acting when the body is just about to move

16. Forces are called concurrent when their lines of action meet in________________?
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A. perpendicular planes

B. one point

C. different planes

D. plane

E. two points

17. According to Lamis theorem___________________?
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A. three forces acting at a point can be represented by a triangle, each side being proportional to force

B. none of the above

C. if three forces acting upon a particle are represented in magnitude and

D. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

E. three forces acting at a point will be in equilibrium

F. ection by the sides of a triangle, taken in order, they will be in equilibrium

18. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be_________________?
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A. r/2

B. 2r/3

C. 3r/2

D. 3r/A

E. r/A

19. Which of the following is a vector quantity___________________?
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A. momentum

B. energy

C. angle

D. mass

E. speed

20. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
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A. Wcos(a + )

B. Wsin(a + )

C. Wtan(a-)

D. Wtan(a + )

E. W (sin a + cos ).

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