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

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

ANSWER DOWNLOAD EXAMIANS APP

Applied Mechanics and Graphic Statics
The maximum displacement of a particle executing S.H.M. corresponds to

Maximum kinetic energy and maximum potential energy
Zero potential energy and maximum kinetic energy
Minimum kinetic energy and minimum potential energy
Zero kinetic energy and maximum potential energy

ANSWER DOWNLOAD EXAMIANS APP