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प्रश्न
Ayesha put two drops of oil on the lid of her tiffin box. Next to that, she put two drops of water and two drops of sugar solution. She tilted the lid. She saw some drops slid down quickly, while some were left behind.
You also try to do the same and then tell - which drop went ahead? Why did it slide faster?
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उत्तर
The drop of water went ahead slide faster. Drops of oil or sugar syrup stick to the tiffin box.
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संबंधित प्रश्न
Ayesha put a puffed puri in a bowl of water. Would it sink or float?
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 | ______ | ______ |
Could you see the salt after it dissolved in water? If no, why?
Does that mean that now the water does not have salt? If it has, then where is the salt?
What difference did you see - in the water with salt, and
the water with chalk powder - after keeping for some time?
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 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.
