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19.

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



20.

Coulomb friction is the friction between                        
A. bodies having relative motion B. two dry surfaces
C. two lubricated surfaces D. solids and liquids



21.

Dynamic friction as compared to static friction is                        
A. same B. more
C. less D. may be less of more depending on na-ture of surfaces and velocity




22.

Frictional force encountered after commencement of motion is called                        
A. post friction B. limiting friction
C. kinematic friction D. frictional resistance



23.

From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the centre of circular plate                        
A. 0.5 cm B. 1.0 cm
C. 1.5 cm D. 2.5 cm



24.

If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be                        
A. maximum B. minimum
C. zero D. infinity



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