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प्रश्न
Name the process which is used in milk dairies to separate cream from milk.
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उत्तर
Centrifugation is used in milk dairies to separate cream from milk.
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
What are the conditions for 'something' to be called 'matter'?
What is the scientific name of particles which make up mater?
Name a liquid which can be classified as a pure substance and conducts electricity.
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
State two physical properties on the basis of which metals can be distinguished from non-metals.
State whether colloidal solutions are homogeneous or heterogeneous.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
What is the effect of temperature on the solubility of solids in liquids ?
What is meant by a solution?
One of the following represents the solution of solid in a solid. This one is :
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
How is scrap iron separated from a heap of waste materials in factories?
How will you separate a mixture of common salt, sulphur powder and sand ?
Define the term matter.
Define the term matter.
