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Matter In Our Surroundings
In this fig. is the distance-time graph of an object. Do you think it represents a real situation? Why?
This distance-time graph does not represent real situation because after 10 hours, the object occupies two different positions simultaneously.
For example, at 10 hours object is at distance 0 km as well as at 75 km which is not physically possible.
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Give reason for the following observations.
Naphthalene balls disappear with time without leaving any solid.
Give reason for the following observations.
We can get the smell of perfume sitting several metres away.
What is the physical state of water at
a) 25°C
b)00C
c)1000C
What is the physical state of water at
0°C
What is the physical state of water at
100°C
Give two reasons to justify
Water at room temperature is a liquid.
Give two reasons to justify
An iron almirah is a solid at room temperature.
Why is ice at 273K more effective in cooling than water at the same temperature ?
What produces more severe burns, boiling water or steam ?
8. Name A, B, C, D, E and F in the following diagram showing state change :
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