Some adjectives end in –ic and some end in –ical. Since there is no rule, it is not easy to find out which form is correct in a particular case.
Answers
1. She is interested in learning classical languages.
2. She had a comical expression on her face.
3. I enjoy watching comic movies.
4. A lot of people believe that the government’s economic policy is in the ruins.
5. I want to buy an economical car.
6. He is doing masters in electrical engineering.
7. It was a historic occasion whose importance was not realized at that time.
8. Do you enjoy reading historical novels?
9. If only we could solve all the problems of the world with the flick of a magic wand.
10. It is not politic to take another loan now.
11. That scandal destroyed his political career.
12. The experience was purely magical.

