Is it correct that the questions of chapters of textbook are always asked in present tense but the answer should always be in past tense.
No, you should answer depending on the tense in the question. It may be in present or past.
Example - Did you have dinner?
No, we did not have our dinner. Yes we had our dinner.
Example - Did you have dinner?
No, we did not have our dinner. Yes we had our dinner.