# Strength of Materials

• ## Frictional force encountered after commencement of motion is called

• A. post friction
• B. limiting friction
• C. frictional resistance
• D. dynamic friction.
Explanation:

No answer description available for this question.

• ## The algebraic sum of moments of the forces forming couple about any point in their plane is

• A. equal to the moment of the couple
• B. constant
• C. both of above are correct
• D. both of above are wrong
Explanation:

No answer description available for this question.

• ## The necessary condition for forces to be in equilibrium is that these should be

• A. Coplanar
• B. Meet at one point
• C. Both (A) and (B) above
• D. All be equal
Explanation:

No answer description available for this question.

• ## Coefficient of friction is the

• A. angle between normal reaction and the resultant of normal reaction and the limiting friction
• B. ratio of limiting friction and normal reaction
• C. the friction force acting when the body is just about to move
• D. the friction force acting when the body is in motion
Explanation:

No answer description available for this question.

• ## The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

• A. 20 kg, – ve sense
• B. 20 kg, + ve sense
• C. 10 kg, + ve sense
• D. 10 kg, – ve sense
Explanation:

No answer description available for this question.

• ## According to principle of transmissibility of forces, the effect of a force upon a body is

• A. Maximum when it acts at the center of gravity of a body
• B. Different at different points in its line of action
• C. The same at every point in its line of action
• D. Minimum when it acts at the C.G. of the body
Explanation:

No answer description available for this question.

• ## The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

• A. r/2
• B. 2r/3
• C. r/A
• D. 3r/2
Explanation:

No answer description available for this question.

• ## A force acting on a body may

• A. introduce internal stresses
• B. retard its motion
• C. change its motion
• D. all of the above.
Explanation:

No answer description available for this question.

• ## Pick up wrong statement about friction force for dry surfaces. Friction force is

• A. proportional to normal load between the surfaces
• B. dependent on the materials of contact surface
• C. proportional to velocity of sliding
• D. independent of the area of contact surfaces
Explanation:

No answer description available for this question.

• ## Kinetic friction is the

• A. Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
• B. Ratio of limiting friction and normal reaction
• C. The friction force acting when the body is just about to move
• D. The friction force acting when the body is in motion