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Which of the following statements about flux are true?

The unit of flux is Nm2/C
The total flux through a surface completely enclosing a charge q is q/ε
The total flux through a closed surface can be positive or negative, depending on whether the enclosed charge is positive or negative.
The total flux through any closed surface that does not contain a charge is zero.
When turning a surface inside of an electric field, the maximum flux is achieved if the electric field vector and the surface vector are perpendicular.

Answer :

Greenleafable
All of these statements about flux are true, except for the last one - When turning a surface inside of an electric field, the maximum flux is achieved if the electric field vector and the surface vector are perpendicular. 
These vectors don't have to be perpendicular, which is why this statement is incorrect, whereas the rest of them are true. 

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