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प्रश्न
Ayesha put a puffed puri in a bowl of water. Would it sink or float?
उत्तर
Puffed puri in a bowl of water would float as it is lighter than water. However, after some time it would start to sink due to the absorption of water by the dough of puri.
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संबंधित प्रश्न
Would the cap of a plastic bottle sink or float on water?
Have you seen that something floats on water while others sink?
Make groups of four friends. For the experiment, you will need 4-5 glasses or bowls, spoons, water, and the things listed in the table. Take some water in each glass. Now try to dissolve one thing in one glass. Observe what happens and note it in the table.
| Things | Did it dissolve or not? | What happened after keeping for 2 minutes? |
| 1. Salt | ______ | ______ |
| 2. Soil | ______ | ______ |
| 3. Chalk powder | ______ | ______ |
| 4. 1 spoon milk | ______ | ______ |
| 5. Oil | ______ | ______ |
Does that mean that now the water does not have salt? If it has, then where is the salt?
Which of the two would you be able to separate from the water by straining with a cloth – salt or chalk powder?
Do you think the oil got dissolved in the water? Why do you think so?
You have washed your handkerchief and you want to dry it quickly. What all can you do?
What things do you put in water to make tea? Which of those things dissolve in water?
You have been given some mishri pieces (lumps of sugar). Suggest some ways to dissolve them quickly.
On Sunday Ayesha’s cousin, brother Hamid came to her house to play. As soon as he came he asked his aunt to make his favourite shakkarpara (a sweet dish). Ammi said, “Let me come back from the market, then I will make some for you. Why don’t you help me? Take two glasses of water and put a bowl of sugar in it. Mix it till it dissolves.” Hamid thought, “Let me finish this work fast. Then I will watch TV”.
Suggest some ways to Hamid for quickly dissolving sugar.
