NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story

Question 12 Wastewater Story - Exercise

Which of the following is wastewater?

(a) Water trickling from a damaged tap.

(b) Water coming out of a shower.

(c) Water flowing in a river.

(d) Water coming out of laundry.


The answer is (d) Water coming out of laundry.


Water discharged during after routine works like washing clothes, flushing toilet, cleaning utensils makes the water dirty. This water is called as waste water. Water coming out of a damaged tap, water coming out of shower and water flowing in a river are not dirty hence water coming out of a laundry is the right answer.

Video transcript
"hey guys welcome to lido q a video i'm vinit your little tutor bringing you this question on your screen explain what is mean by g is equal to z capital g into m by r square where the symbols have their usual meanings right now this equation g equal to capital g m by r square gives the what does it gives it gives the acceleration produced by the earth right isn't that right guys and it is also known as what is it known as the gravitational force or the force of gravity also known as force of gravity right sorry not force of gravity but acceleration due to gravity gravity now what do the terms in this equation means capital g is the gravitational constant right and m is the mass of the earth and capital r is radius of the earth isn't that easy guys so if you still have a doubt please leave a comment below do like the video and subscribe to our channel i'll see you in our next video until then bye guys keep learning"
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