Can have none, 1 or 2.
* * * * *
Cannot have one. Parallel bases mean that any two angles on one side are supplementary. So if one is 90 deg the other must be.
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No.
A right angled triangle, A square, rectangle, a right trapezium, Selected versions of irregular polygons with 5 or more sides.
90 degrees
It could be a kite or a right trapezium.
Non!!! All four angles in a rectangle are 90 degrees. Similarly a square However, for quadrilaterals trapezium/rhombus/kite/parallelogram may have 2 acute angles