Class 7 Waste Water Story CBSE Questions & Answers
Class 7 · Waste Water Story
This is Science Class 7 Waste water Story CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.
Questions & Answers
1
which of the following is wastewater?
- Awater trickling from a damaged tap
- Bwater flowing in ariver
- Cwater coming out of a shower
- Dwater coming out of laundryCorrect
2
Passing chlorine gas through drinking water to disinfect it is called
- ACleaning
- BSterilization
- CChlorinationCorrect
- DAeration
3
Which one is not a of household garbage
- ADal packets
- BVegetable peels
- CCrockery pieces
- DCow dungCorrect
4
sewage is mainly a
- Agaseous waste.
- Bsolid waste.
- Cmixture of solid and gas.
- Dliquid waste.Correct
5
The network of drainage pipe to carry waste water is called
- ADrainage
- BWater supply system
- CWaste water supply
- DSewer systemCorrect
6
Disinfection can be removed by
- AAlkaline
- BChlorinationCorrect
- CpH change
- DAcidity
7
After the treatment the treated water is released into
- AWater bodiesCorrect
- BAll of these
- CSoil
- DGround water
8
Last stage in treatment of sewage is
- ASterilization
- BChlorinationCorrect
- CAeration
- DEvaporate
9
Open drain cause ____________ condition.
- AUnhygienicCorrect
- BHumid
- CTemperate
- DHygienic
10
Jaundice affects which organ?
- ALung
- BKidney
- CHeart
- DLiverCorrect
11
Solid parts of sewage can be used as
- AFertilizers
- BPesticides
- CManureCorrect
- DInsecticides
12
Disease causing micro-organisms are called
- AMicrobes
- BBacteria
- CPathogenCorrect
- DFungi
13
For removing floating wastes in sewage ______________ is used.
- ABar screenCorrect
- BPine screen
- CSieve screen
- DVideo screen
14
Stone and girt present in sewage forms the
- ALodging
- BSever
- CLithotrips
- DSludgeCorrect
15
Adding air to treated water is called
- AFluorination
- BOxygenation
- CChlorination
- DAerationCorrect