Q1: Bitumen felt

ANS:D - all the above.

Bitumen felt is a type of building material that is used for water proofing and damp proofing. It is made from bitumen, a sticky, black, semi-solid form of petroleum, and hessian fibres, which are made from jute or other natural fibres. Bitumen felt is typically used to protect roofs, walls, and other structures from water damage by providing a barrier that prevents water from penetrating the surface. It is also used to prevent dampness and condensation from forming inside buildings by allowing moisture to escape from the structure. Bitumen felt is typically applied in thin layers using a hot asphalt or tar application process, which helps it bond to the surface and form a watertight seal.