In bsc first yr of ou old syllabus student can answer the new question paper?

It depends on the specific requirements of the new question paper and the syllabus changes between the old and new syllabi. Generally, if the new question paper covers topics that were not part of the old syllabus, then students who studied under the old syllabus may not be able to answer those questions.

Universities and examination boards typically announce syllabus changes beforehand, providing students with sufficient time to adapt and cover the new material. If the old syllabus did not cover certain topics that are now included in the new syllabus, it may be best for students to consult with their instructors or academic advisors to determine the best course of action and whether they need to supplement their knowledge to effectively answer the new question paper.