Strength of Materials
Which of the following do not have identical dimensions?

Torque and work
Torque and energy
Momentum and impulse
Moment of a force and angular momentum

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

these forces are equal
the lines of action of these forces meet in a point
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces are parallel

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Strength of Materials
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

remain horizontal
unpredictable
slant up towards direction of pull
slant down towards direction of pull

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