Q1: For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

ANS:C - should be sunk by 50 cm

For providing an Indian type W.C., the R.C.C. slabs in the toilet portion should be sunk by 20 cm. In the construction of an Indian-style water closet (W.C.), the R.C.C. (Reinforced Cement Concrete) slabs in the toilet portion are typically sunk by 20 cm. This sinking helps in accommodating the plumbing fixtures, including the toilet bowl and piping, at an appropriate level relative to the surrounding floor. Sinking the R.C.C. slabs ensures that the plumbing fixtures are properly installed below the floor level, allowing for effective drainage and connection to the sewer system. Additionally, it helps in maintaining the aesthetics and functionality of the toilet area by providing a level surface for the users. Therefore, sinking the R.C.C. slabs by 20 cm is a common practice in the construction of Indian-style water closets.