Question: The discharge per unit plan area of a sedimentation tank, is generally called________________?

• 1. Over flow rate
• 2. Surface loading
• 3. Over flow velocity
• 4. All the above

Question: The gas which may cause explosion in sewers, is_________________?

• 1. Carbondioxide
• 2. Methane
• 3. Ammonia
• 4. Carbon monoxide

Question: The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?

• 1. A heap
• 2. Plateau
• 3. Windrow
• 4. None of these

Question: Pick up the correct statement from the following ?

• 1. Turbidity is more in strong sewage
• 2. The black colour indicates septic sewage
• 3. The sewage omits offensive odours after four hours
• 4. All the above

Question: Pick up the correct statement from the following?

• 1. The boning rod is used for checking the levels of the sewer inverts
• 2. Manhole covers are made circular for the convenience of the cleaning staff
• 3. A manhole is classified as shallow manhole if its depth is less than 0.9 m
• 4. All the above

Question: Pick up the correct statement from the following?

• 1. pH value indicates acidity and alkalinity of sewage
• 2. In acidic sewage, the pH value is less than 7
• 3. In alkaline sewage, the pH value is more than 7
• 4. All the above

Question: Pick up the correct statement from the following?

• 1. Indore method of composting involves decomposition under aerobic conditions
• 2. Bangalore method of composting involves decomposing under anaerobic conditions
• 3. Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus
• 4. all of these

Question: Pick up the correct statement from the following?

• 1. Inlets are provided on the road surface at the lowest point for draining rain water
• 2. Inlets are generally provided at an interval of 30 m to 60 m along straight roads
• 3. Inlets having horizontal openings, are called horizontal inlets
• 4. All the above

Question: Pick up the correct statement from the following?

• 1. The circular section of sewers provides maximum hydraulic mean depth
• 2. The circular sewers are provided for separate sewerage system
• 3. The circular sewers work efficiently if the sections run at least half full
• 4. All the above

Question: Pick up the correct statement from the following?

• 1. Anaerobic bacteria flourish in the absence of oxygen
• 2. Aerobic bacteria flourish in the presence of oxygen
• 3. Facultative bacteria flourish with or without oxygen
• 4. All the above