(a) Water is a liquid because of the following two reasons :
(i) liquids do not have a fixed shape : They take the shape of the container in which they are kept
(ii) Liquids have a fixed volume : Take 100 ml of water in a beaker. Transfer it to a glass, It still remains same, therefore, water is a liquid.
(b) An Iron almirah is a solid at room temperature due to following reasons :
(i) Iron almirah has a fixed shape and a fixed volume
(ii) If we apply force in limits, the volume of iron almirah cannot changed, hence it is in compressible, So it is a solid.
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