Q2 ) D. Both parallelograms and squares are quadrilaterals as they are four-sided figures with opposite sides which are parallel to each other. Some examples would be cubes and possibly, floor tiles. Trapezoids only have one pair of parallel sides which is the top and the bottom which are not equal in length so the two other lines are not parallel.
Q4 ) I do not agree with the statement as not all parallelograms have sides of equal lengths like squares do.
Q5 ) FC and AE should be equal in length as both AD and BC have been equally cut by F and E and opposite sides of parallelograms are equal in length.