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NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story
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Three statements are provided here which define the terms –
(a) sludge
(b) sewage and
(c) wastewater.
Pick out the correct definition for each of these terms.
(a) The settled solids that are removed in wastewater treatment with a scraper.
(b) Water from the kitchen used for washing dishes.
(c) Wastewater released from homes, industries, hospitals and other public buildings.
Answer:
a) Sludge
b) Waste water
c) Sewage
Video transcript
"hey guys welcome to lido q a video
i am vinit your lido tutor bringing you
this question on your screen
a sound signal of 128 vibrations per
second
has a wavelength of 2.7 meter calculate
the speed with which the wave travels
right now what is given to us
frequency is the number of five
resistance per second
therefore frequency here is 128
hertz wavelength
that is denoted by lambda is 2.7 meter
therefore speed of wave
we know is
wavelength into frequency that is equal
to 128
into 2.7 that is equal to
345.6 meter per second
isn't that easy guys 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 keep
flourishing"
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