Questions

‘Prefer’ is followed by the gerund form of the verb. Thus, ‘spend’ needs to be replaced with ‘spending’ to make the sentence grammatically correct. Thus, the correct sentence would be, ‘Though he is a gifted comedian, he prefers spending his spare time watching horror movies.

Generic means related to a group of similar things rather than a particular one. It means it is not a specific thing like branded or trademarked. Hence it is a basic one.

Among the given options, Generic is most similar in meaning to Basic.

It is the friction between the feet and the ground that helps us to walk. Without this friction we would slip and fall

The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area. This surface tension is the "skin" of a body of water that makes the molecules stick together.