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Focused topic practice

strength of materials MCQs

Practise focused strength of materials questions with marked answers for exam preparation and subject revision.

strength of materials Mcqs

1. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to___________________?
0

A. Wtana

B. Wan(a-)

C. W

D. W sin (a + $)

E. Wtan(a +

2. Coulomb friction is the friction between_________________?
0

A. bodies having relative motion

B. solids and liquids

C. electrically charged particles

D. two lubricated surfaces

E. two dry surfaces

3. Which is the correct statement about law of polygon of forces ?
0

A. 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

B. if a polygon representing forces acting at a point is closed then forces are in equilibrium

C. none of the above

D. if any number of forces acting at a point can be represented by the sides

E. a polygon taken in order, then the forces are in equilibrium

F. 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

4. The co-efficient of friction depends upon________________?
0

A. shape of the surfaces

B. nature of surfaces

C. ail of the above.

D. A. and B. above

E. area of contact

5. The algebraic sum of moments of the forces forming couple about any point in their plane is________________?
0

A. equal to the moment of the couple

B. constant

C. both of above are correct

D. both of above are wrong

E. none of the above

6. D Alemberts principle is used for___________________?
0

A. determining stresses in the truss

B. solving kinematic problems

C. stability of floating bodies

D. designing safe structures

E. reducing the problem of kinetics to equivalent statics problem

7. The product of either force of couple with the arm of the couple is called________________?
0

A. resultant couple

B. moment of the couple

C. resulting couple

D. none of the above

E. moment of the forces

8. If a rigid body is in equilibrium under the action of three forces, then_______________?
0

A. B. and C. above

B. none of the above

C. these forces are equal

D. the lines of action of these forces meet in a point

E. the lines of action of these forces are parallel

9. The coefficient of friction depends on_________________?
0

A. area of contact

B. all of the above

C. shape of surfaces

D. nature of surface

E. strength of surfaces

10. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?
0

A. independence of forces

B. forces

C. balance of force

D. resolution of forces

E. dependence of forces

11. The C.G. of a plane lamina will not be at its geometrical centre in the case of a______________?
0

A. right angled triangle

B. square

C. rectangle

D. circle

E. equilateral triangle

12. The ratio of limiting friction and normal reaction is known as_______________?
0

A. angle of friction

B. coefficient of friction

C. sliding friction

D. friction resistance

E. angle of repose

13. Frictional force encountered after commencement of motion is called________________?
0

A. limiting friction

B. frictional resistance

C. post friction

D. dynamic friction

E. kinematic friction

14. The unit of force in S.I. units is_________________?
0

A. joule

B. kilogram

C. newton

D. dyne

E. watt

15. The maximum frictional force which comes into play when a body just begins to slide over another surface is called_____________________?
0

A. limiting friction

B. kinematic friction

C. dynamic friction

D. sliding friction

E. rolling friction

16. The center of percussion of the homogeneous rod of length L suspended at the top will be__________________?
0

A. 2L/3

B. 3L/4

C. L/3

D. L/2

E. 3L/8

17. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to_________________?
0

A. Wcos(a + )

B. Wsin(a + )

C. Wtan(a-)

D. W (sin a + cos )

E. Wtan(a + )

18. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
0

A. the floor is smooth, the wall is rough

B. the floor is rough, the wall is smooth

C. the floor and wall both are smooth surfaces

D. the floor and wall both are rough sur-faces

E. will be in equilibrium under all condi-tions

19. Pick up wrong statement about friction force for dry surfaces. Friction force is________________?
0

A. proportional to velocity of sliding

B. none of the above is wrong statement

C. proportional to normal load between the surfaces

D. independent of the area of contact surfaces

E. dependent on the materials of contact surface

20. The units of moment of inertia of mass are_____________________?
0

A. m2/kg

B. kg/m

C. kg/m2

D. kg m2

E. m4

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