Is it correct to cement the ground in our house surroundings, constructing wall to wall cement roads ? What are the impacts of this kind of activties?

Express the change in internal energy of a system when 1) No heat is absorbed by the system from the surroundings, but work (w) is done on the system. What type of wall does the system have ? ii) No work is done on the system, but a amount of heat is taken out from the system and given to the surroundings. What type of wall does the system have? iii) w amount of work is done by the system and q amount of heat is supplied to the system. What type of system would it be?

Fill in the blanks with correct answers : ………………….was used in the construction of walls and towers.

No heat is absorbed by the system from the surroundings, but work (w) is done on the system. What type of wall does the system have?

No work is done on the system, but heat (q) is taken out from the system by the surroundings. What type of wall does the system have?