As compared to fresh river water, the percentage of oxygen in seawater is approximate _____

Which of the following pairs is not correctly matched?

The cleaning of slow sand filter is done by

Which of the following treatments reduces the salinity of water?
1. Flash mixing and sedimentation
2. Electrodialysis
3. Reverse osmosis
4. Freezing
5. Filtration
Select the correct answer using the codes given below.
Codes:

The grit chambers of a sewage treatment plant, normally need cleaning

A commonly used handpump is the

Minimum shear reinforcement is provided to ______

For a continuous flow type of sedimentation tanks

The equation P/W+V2/2g+Z= constant is based on which of the following assumption regarding the flow of fluid?

In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at agreat distance from the airfoil , where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart is