Home
About
FAQs
System Requirements
In the news
Workshops
Training
Training Calendar
Request for Training
Training Status
Registration
For Teachers
For Students
For Schools
Contact us
Login
Languages
English
हिंदी
മലയാളം
मराठी
ಕನ್ನಡ
you are here->
home
->
Biology
->
Class 12
->
Studies on Turbidity, pH and Microbial Presence in Water
Studies on Turbidity, pH and Microbial Presence in Water
Theory
Theory
Procedure
Animation
Simulator
Video
Viva Voce
Resources
Feedback
1)
What is turbidity?
Strength of water
Amount of living organisms in water
Colour of water
Relative clarity of water
2)
The pH of pure water is ______at 25°C.
5
8
7
6
3)
We can measure the turbidity using __________.
Raffo’s disk
pH meter
Secchi’s disk
Turbo meter
4)
What is the definition of pH?
A measure of the relative amount of free hydrogen and hydroxyl ions in an aqueous solution.
Negative logarithm of Helium ion.
The strength of an aldehyde expressed in terms of hydronium ion concentration.
Concentration of salt.
5)
Why are green plants seen only in photic zones?
This layer of water is penetrated by sufficient sunlight for photosynthesis.
Photic zone contains more nutrition.
It contains more suspended particles.
Oxygen is available only in photic zone.
6)
If the water body is more turbid then, _______________.
the thickness of its photic zone is less.
the thickness of its photic zone is more.
it contains less suspended particles.
light can penetrate in more depth.
7)
Which is true of Buffer solutions?
Will always have a pH of 7.
Tend to maintain a relatively constant pH.
Cause a decrease in pH when acids are added to them.
Are rarely found in living systems.
8)
Which of the following describes a non-productive water body?
Has high amounts of dissolved oxygen.
Has a very low density of phytoplankton per unit area.
Bears a large number of organisms.
Has high nutrient concentration.
9)
How can the pH value of a water sample be determined?
All the options are correct.
By using a pH meter.
By using universal indicator solution.
By using pH paper strips.
10)
The following figure illustrates the method of taking a Secchi’s disk reading. Find out the depth of photic zone using Secchi’s disc reading.
95 cm
80 cm
90 cm
85 cm