A survey research firm yesterday acknowledged that it was polling the political views of delegates to the forthcoming White House Conference on Aging on behalf of the Republican National Committee.

The acknowledgement came in a letter to the House Select Committee on Aging chaired by Rep. Claude D. Pepper (D-Fla.), who immediately demanded to know whether the RNC is engaged in "an outrageous attempt to politicize" the White House conference.

Members of the House committee staff said they thought the RNC was nervous that delegates to the conference would be critical of the Reagan administration's Social Security policies and budget cuts. Pepper questioned whether the RNC sought to "stack the important committees" of the conference that will consider those issues.

RNC officials declined to return calls from The Post last night.

The survey of delegates was conducted by telephone by the Campaign Marketing Group. That firm informed Pepper's committee yesterday that it had only asked the questions put to it by the RNC, calling a list of people provided by the committee.

According to earlier reports, the survey asked delegates for their political affiliations and their views on issues like Social Security and budget cuts.

One-third of the delegates to the conference, which will convene late next month, were chosen by members of Congress, one-third by state governors, and one-third by the staff of the conference itself, most of whom will have been chosen since President Reagan took office.

Pepper has demanded that a representative of the RNC testify before his committee Thursday to explain its role in the survey of delegates and the purpose of the survey.