Advertisements
Advertisements
प्रश्न
How is cream separated from milk ?
Advertisements
उत्तर
Cream is separated from milk by the process of centrifugation. It is the process of separating the suspended particles from a liquid. The mixture is rotated at high speed in a centrifuge.
When milk is centrifuged, the cream and skimmed milk are separated. Cream, being lighter, starts floating on the skimmed milk and hence, can be separated.
APPEARS IN
संबंधित प्रश्न
Define the following term of Atom .
Explain why air is used to inflate tyres.
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
What is meant by saying that non-metals are brittle ?
“Is malleable and ductile” best describes :
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
State whether colloidal solutions are homogeneous or heterogeneous.
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Describe a method to separate a mixture of camphor and sand.
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
The boiling point of liquid argon is :
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
______ is used for industrial refrigeration and transporting frozen food.
Define the term matter.
Define the term matter.
