How to get only one question to the preview page in survey management website in angular?

I am using querystring to h=get the questions on preview page but I am not able to get one question on 1st page and 2nd on another page after clicking next button.

Querystring

const queryString = {
      SurveyId: 1,
      PageNo: 0,
      PageSize: 20
    };
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