The phrase "added questions about" is correct and usable in written English.
You can use it when referring to additional inquiries or topics that have been included in a discussion or document.
Example: "During the meeting, the manager added questions about the project's timeline and budget."
Alternatives: "included inquiries regarding" or "supplemented with questions about".
Because so many of its members were reporting election-related stress, the APA added questions about politics to its annual survey in August.
This year, the Massachusetts Institute of Technology and the University of Iowa added questions about sexual orientation to their undergraduate applications, joining Elmhurst College in Illinois and the law schools at Boston University, the University of Pennsylvania and the University of Washington.
As part of the deal, NetZero added questions about what kind of cars visitors drive and when they are likely to buy a new one.
Faneuil then related how he misled Merrill Lynch and U.S. federal investigators probing attempted sales of ImClone shares by Waksal and completed sales by his daughters, at least when they added questions about Stewart's sale.
The study involved adults in 10 states and Washington, D.C. that added questions about bad childhood experiences.
Then, after a moment of silence, he began asking newly added questions about the U.S. response to ISIS and unrest in the Middle East.
Then add questions about joining a trial.
I asked to add questions about family history to the study.
In 2008, for example, Congress passed a law requiring the American Community Survey to add questions about computer and Internet use.
"At CEMS we do all that, but this also gives us the ability to add questions about sustainability and corporate social responsibility".
Nevertheless, to the usual questions about voters' top choices, pollsters should add questions about their second or third choices and about those candidates they'd refuse to vote for under any circumstances.
