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Give the applications of centrifugation
[
CBSE Class 9 Social
]
(2)
State the properties of colloidal solution
[
CBSE Class 9 Social
]
(2)
What is a colloidal solution?
[
CBSE Class 9 Social
]
(2)
State the properties of a suspension
[
CBSE Class 9 Social
]
(2)
State the properties of a solution
[
CBSE Class 9 Social
]
(2)
Distinguish between a physical change and chemical change
[
CBSE Class 9 Social
]
(2)
Give the differences between mixture and compound
[
CBSE Class 9 Social
]
(2)
Why is mixture called impure substance?
[
CBSE Class 9 Social
]
(2)
Explain giving examples the various factors on which rate of evaporation depends
[
CBSE Class 9 Social
]
(2)
Pressure and temperature determine the state of a substance. Explain this in detail
[
CBSE Class 9 Social
]
(2)
With the help of an example, explain how diffusion of gases in water is essential?
[
CBSE Class 9 Social
]
(2)
How is the high compressibility property of gas useful to us?
[
CBSE Class 9 Social
]
(2)
The melting point of ice is 273.16 K. What does this mean? Explain in detail
[
CBSE Class 9 Social
]
(2)
Name the factors that affix l evaporation
[
CBSE Class 9 Social
]
(2)
The temperature at which liquids change into vapours is very high,
[
CBSE Class 9 Social
]
(2)
On a last sunny day, why do people sprinkle water on the roof or open ground?
[
CBSE Class 9 Social
]
(2)
Why arc solids generally denser than liquids and gases?
[
CBSE Class 9 Social
]
(2)
Cotton in solid but it floats on water. Why?
[
CBSE Class 9 Social
]
(2)
State the differences between solid, liquid and gas
[
CBSE Class 9 Social
]
(2)
Why is water liquid at room temperature?
[
CBSE Class 9 Social
]
(2)
One kg cotton and one kg sand, which is more denser? Why?
[
CBSE Class 9 Social
]
(2)
What are fluids?
[
CBSE Class 9 Social
]
(2)
Why is it advisable to use pressure cooker at higher altitudes?
[
CBSE Class 9 Social
]
(2)
Distinguish between evaporation and boiling.Explain
[
CBSE Class 9 Social
]
(2)
Why do people perspire a lot on a hot humid day?
[
CBSE Class 9 Social
]
(2)
A balloon when kept in sun, bursts after some time. Why?
[
CBSE Class 9 Social
]
(2)
Liquids and gases can be compressed but it is difficult to compress solids. Why?
[
CBSE Class 9 Social
]
(2)
Explain why solids have fixed shape but liquids and gases do not have fixed shape
[
CBSE Class 9 Social
]
(2)
Why do we see water droplets collected on the outer surface of a glass container,
[
CBSE Class 9 Social
]
(2)
Write any three constraints on the powers of the Prime Minister
[
CBSE Class 9 Social
]
(2)
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