Arrange the following substances in increasing order of forces
of attraction between the particles— water, sugar, oxygen.
Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving
any solid.
(b) We can get the smell of perfume sitting several metres
away.
Convert the following temperatures to the kelvin scale.
(a) 25°C
(b) 373°C
Convert the following temperatures to the celsius scale.
(a) 293 K (b) 470 K
Why are we able to sip hot tea or
milk faster from a saucer rather
than a cup?
Why does our palm feel cold
when we put some acetone or
petrol or perfume on it?
How does the water kept in an
earthen pot (matka) become cool
during summer?
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