Q1. (a) Q1. marks How can deterioration of concrete be prevented?
(a) Q1. marks How can deterioration of concrete be prevented?
(b) Define slack of an event and float of an activity.
(c) A section line AB 310 m long on a flat terrain measures 102.5 mm on the vertical photograph. A radio tower also appears on the photograph. The distance measured from the principal point to the image of the bottom and top of the radio tower were found to be 7.5 cm and 8.5 cm respectively. The average elevation of terrain was 550 m. Determine the height of the tower. Take focal length (f) of the camera as 152.4 mm.