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Matter In Our Surroundings
What is meant by motion in a straight line ? Give some examples of such a motion.
When the position of a body changes with time, the body is said to be moving in a straight line.
Examples of motion in a straight line or rectilinear motion are:
(i) A bus moving on a straight road,
(ii) A train moving on a straight track,
(iii) A runner running along a straight track,
(iv) A ball moving along a straight path, and
(v) An object falling vertically downwards towards the surface of the earth.
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Convert the following temperature to Celsius scale.
300K
Convert the following temperature to Celsius scale.
573 K
Convert the following temperatures to Kelvin scale
25°C
What is the physical state of water at
100 °C
For any substance, why does the temperature remain constant during the change of state ?
Suggest a method to liquify atmospheric gases.
Convert the following temperatures to Kelvin scale.
35°C
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
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