The two candidates for Virginia's 10th District congressional seat met yesterday before a high school audience that sought positions on a range of issues from the Equal Rights Amemdment to the B1 bomber.

Squaring off in one of the livelier of their nine face-to-face encounters, Democratic incumbent Joseph L. Fisher and his challenger, Frank Wolf, lost little time in setting out their differences in the auditorium of James Madison High School in Vienna.

"My opponent usually takes this and that out of context . . . and magnifies it into what amounts to his campaign," said Fisher in his first trip to the podium. "It's pretty thin stuff in my judgment."

"That just isn't true," said the Republican Wolf when it was his turn to speak.

Both candidates won warm aplause from the 450 seniors as they tried to score their points.

During one exchange, Wolf said Fisher "talks one way and walks another."

"I walk with my feet. I talk with my mouth," Fisher retorted. "I try to keep my feet out of my mouth. If he (Wolf) can't separate his feet from his mouth, that's his problem."

That response was greeted with laughter and cheers from the audience.

Students' questions, passed along in writing to a moderator, evoked a wide-ranging discussion of issues. For example, Fisher was asked, "Why did you vote against the B-1 bomber and the nuclear carrier if you are in favor of a strong national defense?"

A question to Wolf was: "You support a 30 percent tax cut. If it passes, where are you going to cut spending."

Wolf said in his opening statement that Fisher is strongly supported by liberal groups, such as labor organizations, while Fisher responded that Wolf "does well with big business and right wing political organizations."

In answer to a question, Fisher said he favors giving full voting rights to the District of Columbia. Wolf said he would prefer that the District have voting rights in the House of Representatives, but not in the Senate.

Wolf also said he favors the Roth-Kemp tax plan, which would have cut taxes by 30 percent over a three-year period.

"The congressman has ridiculed me about it (Roth-Kemp)," Wolf said. "Then, he turned around last week and voted for the son of Roth-Kemp."

Fisher answered that he had voted the Nunn amendment, which has been referred to as the son of Roth-Kemp, because he found it more responsible than the Roth-Kemp tax cut plan. He said Roth-Kemp would have made massive cuts in taxes, but no major cuts in expenditures. The Nunn amendment which will cut taxes 5 percent a year between 1980 and 1983, "linked reasonable cuts with expenditures. Roth-Kemp stands second to Nunn," he said.

Fisher said he favors cuts in public works, water projects, CETA and "some of the military."

When Fisher responded to the ERA question, he quickly pointed out, "Here again, I'm the one who has the record," referring to his vote on the House floor in favor of extending the deadline for ratification.

In response, Wolf, who opposes the measure, said, "I have four daughters. Any man who has four daughters has to believe in equal rights."