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Q1) 5 ml of water was taken in a test tube and china dish separately. These samples were
then kept under different conditions as below (a) Both the samples are kept under the fan.
(b) Both the samples are kept in a cupboard. State in which case evaporation will be
faster? Give a reason to support your answer.
A glass tumbler containing hot water (60 0C) is kept in the freezer compartment of a refrigerator
Q2) (-5C0
) Draw a graph between the temperature and time showing the process of
conversion of hot water to ice.
Q3) a)A rubber band can change its shape on stretching. Will you classify it as solid or not?
Justify your answer.
(b)Arrange the three states of matter in the increasing order of (i) rate of diffusion (ii)
Intermolecular force of attraction. (iii) particle motion
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(a) Evaporation will be faster under a fan. Since fan helps in the fast movement of the air, water will get more opportunity to evaporate under a fan than inside a cup board. In this case, the outside air will not come in contact with water.
(b) On a rainy day, there is humidity in air. As a result, evaporation of water will slow down.
The correct answer is (a). The temperature of the water in a tumbler will fall initially till it reaches 0 °C, the freezing point of water. After reaching the freezing point, the temperature will remain constant till all the water has been converted into ice.
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