Q1: Pile foundations are generally preferred to for

ANS:B - sky scrapper buildings

Pile foundation will resist the horizontal forces acting on skyscraper building due to the wind.

It will act as a tensile pile too. To resit horizontal tensile forces. According to soil condition, pile foundation is a prefererd bridge on both the structure pier and abutment. Actually mostly bridge have well foundation but in some bridges pile foundation is also carried out.