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

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

ANSWER DOWNLOAD EXAMIANS APP

Applied Mechanics and Graphic Statics
A body is said to move with Simple Harmonic Motion if its acceleration, is

Inversely proportion to the distance from the point of reference
Always directed away from the centre, the point of reference
Proportional to the square of the distance from the point of reference
Proportional to the distance from the point of reference and directed towards it

ANSWER DOWNLOAD EXAMIANS APP