3.11 Balance these equations. (a) Al(s) + O¿(g) →Al;O;(s) (b) N;(g) + H¿(g)→NH;(g) (c) C,H(t) + O¿(g)→H;0(t) + CO2(g)

A- choose the correct answer from the given options (20 marks) 1- Isohyets are the imaginary lines joining the points of equal a- Pressure b- Height 2- Shorter the duration of rainfall a- Greater b- Constant c- Humidity d- Rainfall will be the rainfall intensity. c-Slightly lesser d-Lesser 3- time taken for the storm water to travel from the most remote point to the drain is a-duration of rainfall. c- time of concentration b- the time taken, for precipitation d-time taken for all the ran off to reach the drain 4- Perennial stream is normally dry during hot summer months. a- True b-False 5- According to Dalton's law, under given conditions, the evaporation is proportional to a- The vapor pressure deficit at the surface of the water body at water temperature. b- The difference between saturation vapor pressure at 100°C and the actual vapor pres c- The difference between the actual vapor pressure and the saturation vapor pressure: d- None of these 6- P is the precipitation, A is the area…

A. yield stress B. ultimate tensile stress C. fracture stress D. elastic deformation region E. plastic deformation region