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Discover ncert solutions class 6 science and question answers chapter-wise. Access free, accurate, and easy-to-understand answers to all your Class 6 Science questions now, and confidently enhance your exam preparation.
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Q 151.
The process where,water changes into vapors after heating is called?
Ans.
Evaporation.
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Q 152.
When water is mixed with plaster of Paris it becomes?
Ans.
Very hard.
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Q 153.
Natureof physical changes?
Ans.
They are temporary and are reversed.
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Q 154.
What changes does physical change involve?
Ans.
Absorption aur releases in energy.
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Q 155.
What changes does chemical change involve?
Ans.
Change of state as well as composition.
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Q 156.
Name the example of periodic change?
Ans.
Clock pendulum.
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Q 157.
What do you mean by chemical changes?
Ans.
A process that transforms one or more objects into one or more new different objects.
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Q 158.
What do you mean by physical change?
Ans.
When object or substance undergo a change that does not change its chemical composition.
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Q 159.
What are the examples of physical changes?
Ans.
Melting an ice cube.
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Q 160.
What happened when both physical and chemical changes take place?
Ans.
Energy is either absorbed aur released.
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Q 161.
What are the examples of undesirable changes?
Ans.
Earthquake
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Q 162.
Examples of irreversible changes?
Ans.
Heating,Burning and mixing and pondering.
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Q 163.
What are the properties of metals?
Ans.
1.Metal expand on heating.2.
Metal contract on cooling. |
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Q 164.
All changes are reversable in nature?
Ans.
No
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Q 165.
Examples of Reversed changes?
Ans.
1. A Ballon changes its shapes and size on blowing air into it.2.
Dissolving sugar in water |
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Q 166.
More of a substance can be dissolved in a solution by?
Ans.
By Heating
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Q 167.
Name the process by which components of a sugar in a water can be separated?
Ans.
Crystallisation
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Q 168.
With the help of which Threshing can be done?
Ans.
1.Animals
2.Beating 3.Machines |
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Q 169.
Name the process by which butter is separated from milk?
Ans.
Churning
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Q 170.
If you want to prepare ghee from milk at home.What method do you adopt?
Ans.
Decantation and filtration
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Q 171.
What is the example of filtration method separation of rice from stone,salt in water,tea leaves from tea,oil in water?
Ans.
Tea leaves from tea
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Q 172.
A person is having some diseases and want to have Lassi with less fat. Which method should he adopt?
Ans.
Churning
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Q 173.
Why do we separate substances?
Ans.
Because sometimes it contains non-useful components.
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Q 174.
Two friend bought some vegetables such as egg plant,lady’s finger, green chillies, and potatoes all mixed in a bag. Which of the methods of separation would be most appropriate for her to separate them?
Ans.
Vegetables are big in size so hand picking is a best method to seperate them.
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Q 175.
Process of filtration can be used to separate in a mixture of insoluble?
Ans.
Liquid and solid
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Q 176.
In the process of evaporation liquid changes into?
Ans.
Vapours
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Q 177.
Name the process by which husk and stone could be separated from grain?
Ans.
Hand-picking
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Q 178.
Name the process by which two or more than two components are mixing together in any ratio?
Ans.
Mixing
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Q 179.
Name the process by which the heavier components in a mixture settles after water is added to it?
Ans.
Sedimentation
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Q 180.
Name the process that is used to separate components of a mixture having different sizes?
Ans.
Sieving
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