It would depend on what you're talking about.
If you are refering to the subject, it would be 'physics'.
But if you are refering to something that is tangible, then it would be 'physical'.
It's a handmade, life-size doll or puppet
1. me encanta
2. me encantan
3. me gustan
4. no me gusta
5. me encantan
6. me encantan
7. me encanta
Answer:
Aquel.
Explanation:
Por las dudas, debes contarme ____aquel___ secreto.
...