Ans. wooden doors and steel plate
Ans. Both are in liquid state.
Ans. belt and hand-bag
Ans. Iron, Aluminium and Copper
Ans. cups, plates, toys, buckets, baskets
Ans. Water is capable of dissolving most of the substances in it. That is why it is known as universal solvent.
Ans. Object with higher density than water will sink. A coin is made up of metal. Density of metal is higher than water. That’s why coin sinks in water.
Ans. Cooking utensils have wood or plastic handles to prevent us from burning our hands when utensils are hot.
Ans. Oil does not dissolve in water because the space between the molecules of water is not occupied by the oil.
Ans. Due to the action of air and moisture on them, a dull layer of some other compound appears on them. Thus material loses their shine and appears dull.
Ans. We can group things in more than one way because one object can have more than one property.
Ans. Oxygen and carbon dioxide gas dissolved in water are needed for the survival of animals and plants that live in water.
Ans. The degree of compactness of a substance is called density. The object which is denser than water will sink whereas object which is less dense than water will float.
Ans. Water molecules surround the tiny sugar cubes and hit them. This weakens the attractive forces of the surrounding molecules and pulls them into the solution.
Ans. This is done, so that customer can easily pick the things needed and compare values of different brands available.
Ans. The process of grouping things together on the bases of some similar characteristics is called classification.
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