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7.

A cube on a smooth horizontal surface                        
A. cannot be in stable equilibrium B. cannot be in neutral equilibrium
C. cannot be in unstable equilibrium D. can be in any of these states



8.

The following is in unstable equilibrium                        
A. a uniform solid cone resting on a generator on a smooth horizontal plane B. a uniform solid cone resting on its base on a horizontal plane
C. a solid cube resting on one edge D. a satellite encircling the earth



9.

A block in the shape of a parallelopiped of sides lm x 2m x 3m lies on the surface. Which of the faces gives maximum stable block ?                        
A. 1 m x 2 m B. 2 m x 3 m
C. 1 m x 3m D. equally stable on all faces




10.

A uniform pyramid and a uniform prism of same height lie with their base on the surface. Which is more stable ?                        
A. pyramid B. prism
C. both equally stable D. none of the above



11.

Minimum potential energy of a system will be in the position of                        
A. stable equilibrium B. unstable equilibrium
C. neutral equilibrium D. all of the above



12.

A rigid body is in a stable equilibrium if the application of any force                        
A. can raise the CG of the body but can not lower it B. tends to lower the CG of the body
C. neither raises nor lowers the CG of the body D. none of above



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