Write True (T) of False (F) against the following statements in the given brackets:
1. Primary treatment of waste water is a mechanical process. ( )
2. Scum is removed with a skimmer. ( )
3. Septic tank is an example of on-site sewage disposal system. ( )
4. Aeration of clarified water kills disease-causing microbes. ( )
5. Sewer pipes are made up of case iron. ( )

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Solution

1. True (T)

2. True (T)

3. True (T)

4. False (F)
Ozonisation or chlorination is used to kill disease-causing microbes.

5. True (T)

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Similar questions

Q. Match the following correctly [3 MARKS]

\begin{matrix} C l e a n i n g o f w a t e r i s a p r o c e s s o f & s e w a g e t r e a t m e n t p l a n t W a s t e w a t e r r e l e a s e d b y h o u s e s i s c a l l e d & r e m o v i n g p o l l u t a n t s D r i e d s l u d g e i s u s e d a s & l o w c o s t d i s p o s a l s y s t e m s D r a i n s g e t b l o c k e d b y & m a n u r e W a s t e w a t e r i s t r e a t e d i n & s e w a g e S e p t i c t a n k s, c h e m i c a l t o i l e t s, c o m p o s t i n g p i t s a r e e x a m p l e o f & c o o k i n g o i l s a n d f a t s \end{matrix}

Q. Match the items in Column A with the items in Column B:

Column A	Column B
1. Tertiary treatment	(a) Mechanical process
2. Sewers	(b) Biological process
3. Waste water	(c) Scum
4. Secondary treatment	(d) Sewage
5. Primary treatment	(e) Pipes carrying sewage
	(f) Chemical process

Question 12

State whether the following statements are True or False. In case a statement is false, write the correct statement.
1. Sewage is a solid waste which causes water pollution and soil pollution.
2. Used water is wastewater.
3. Wastewater could be reused.
4. Where underground sewerage systems and refuse disposal systems are not available, the high-cost onsite sanitation system can be adopted.

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Tree is an opaque substance. ( )
2. All gases are insoluble in water. ( )
3. All things are made up of materials. ( )
4. Kerosene is soluble in water. ( )
5. A piece of wood floats on water. ( )

Some students of class 7 were taken for an educational trip to Waste water treatment plant .The teacher explained the process of water treatment. Identify the correct order of the process.

Step I:The liquid material is passed through sedimentation tank where solid waste like faecal matter, sand, grit settles down.

Step II:This solid matter is then removed with the help of a scrapper. This is the sludge.

Step III: Waste water is passed through bar screens to remove big objects like cans, sticks, rags etc.

Step IV: A skimmer removes the floatable solids like oil, grease etc.

Step V: Air is pumped into clarified water to help aerobic bacteria to grow. The bacteria then consume the unwanted matter still present in clarified water.

Step VI: The clear water so obtained is called clarified water.

Step VII:The suspended microbes settle at the bottom & the water is removed from the top.

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1. True (T) 2. True (T) 3. True (T) 4. False (F) Ozonisation or chlorination is used to kill disease-causing microbes. 5. True (T)

1. True (T)

2. True (T)

3. True (T)

4. False (F)
Ozonisation or chlorination is used to kill disease-causing microbes.

5. True (T)