Applied Mechanics and Graphic Statics
The characteristic of a couple is:

All listed here
A couple can be never the balanced by a single force
Algebraic sum of forces, constituting a couple is zero
Algebraic sum of moments of forces, constituting a couple, about any point, is same

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Applied Mechanics and Graphic Statics
Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down

Rubber and lead balls undergo equal changes in momentum
Change in momentum suffered by lead ball is less that of rubber ball
None of these
Momentum of rubber ball is less than that of lead ball

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