Plz help me with the fill ups
Answers
Fill ups:-
- Metre is the unit of Length.
- Chromatography is based on the principal of?
Ans: Chromatography is basically based on principal of extracting pure material by the process of cooling.
- In petroleum refining , the method of separation used is fractional distillation.
- The larvae of an amphibian is free living embryo.
- Ctenidila are respiratory organs in mollusks.
Question / Answers :-
- Define least count of any device.
Answer: Least count of an instrument is the smallest measurement that the instrument can make accurately. The least count of: Metre scale : 0.1cm.
- A few drops of Dettol added when added to water , it turns turbid. why?
When drops of Dettol is added to water , a process of "microemulsion" happen. microemulsion is a thermodynamically stable , isotropic solution of water , oil and amphiphile. So, on mixing Dettol in water , the tiny droplets of oil gets suspended in the water. this leads to turbidity of the solution.
- Define taxonomy.
Taxonomy is a scientific way to determine things into classes. or in other words, taxonomy is classification of things in a scientific way.
- Define measurement.
Measurement is the standard considered ratio for quantifying anything.
- Which of the following is pure substance? Ice , milk , iron , hydrochloric acid , Mercury , brick and water.
A pure substance is something that has same composition throughout.
→ Ice : it is a solidified form of water , which remains pure. So this is a pure substance.
→ iron : It has no other metal mixed.
→ water : water is a pure substance
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While ,
Milk , hydrochloric acid , mercury and brick are the things that are not pure.
- Write the rules that are followed in writing symbols of unit in SI system.
→ They are written in the lowercase. except celcius.
→ It should be well defined.
→ It should be unchangeable.
- Explain tyndal effect and Brownian motion.
Tyndal effects : scattering of a beam of light by a medium containing small suspended particles
Brownian motion : It is the small and really negligible fluctuations of objects.