3. The given figure shows gradually varied flow in an open channel with a beak in bed slope. Types of water surface profiles occurring from left to right are
Correct Answer: sludge in the secondary tank post-aeration rich in microbial mass
5. Consider the following statements : 1. An ascending gradient of 1 in 100 meets an ascending gradient of 1 in 120 to form a Valley curve. 2. A falling gradient of 1 in 25 meets a falling gradient of 1 in 50 to form a summit curve. 3. The length of summit curve is determined on the basis of head light sight distance. Which one of the statements given above is/are correct?
6. Consider the following methods of preservation of timber : 1. Dipping 2. Brushing or spraying 3. Pressure impregnation The correct sequence in decreasing order of the effectiveness of these methods of preservation is
8. In a PERT network, the activity durations are given as to (optimistic), tp (pessimistic) and tm (most likely time). What is the variance of is activity?
9. Consider the following statements : A : In masonry, bricks are joined together by cement mortar. B : Cement mortar adheres more effectively to brick surface than any other material.
Options
A. both A and R are true and R is the correct explanation of A
B. both A and R are true but R is not the correct explanation of A
10. Consider the following statements : Collision diagram is used to 1. study accident pattern 2. eliminate accidents 3. determine remedial measures 4. make statistical analysis of accidents Of these statements :