1. Goa board does not give Class 8 papers on its site

2. You can check sample papers on Careers360 site

3. History part comes in Social Science sample paper

4. It has short and long questions from history chapters

5. Total marks of history part is around 20

6. You can download and practicelike real exam

https://school.careers360.com/boards/gbshse/goa-board-ssc-question-papers

This link  will help you get a real idea of the 20 mark history questions for Class 8 Goa board.