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NCERT
SOLUTIONS
CLASS - 5th
aglase .co
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Class : 5th
Subject : Environmental Studies
Chapter : 7
Chapter Name : Experiments With Water
Q1 Ayesha put a puffed puri in a bowl of water. Would It sink or float?
Answer. It would float.
Page : 60 , Block Name : Think What Would Happen If
Q2 You put a steel plate on water. Would it sink or float? What would happen to a
Answer. If the plate is put carefully over the surface of water, it would float. However, the spoon will
sink.
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Q3 Would the cap of plastic bottle cap sink or mat on water?
Answer. It would float.
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Q4 Have you seen that something float on water while of hers sink? Think how this happens ?
Answer. Yes, I think that, when water displaced by any thing is greater than it weight, it on water
otherwise it sinks.
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Q5 Mark (✔) for the things that float. Mark ( ✖ ) for those that sink.
Answer.
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Q6 Find out from the other groups which things floats and which sank in the water.
Answer. A football, a piece of thermocol etc. float on water while a cricket ball, a spoon etc. sink.
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Q7 After doing the experiment, fill in the blanks.
1. The iron nail ______ in water but the katori ______. I think this happened because
_____________________________.
2. The empty plastic bottle ______ on water. The bottle filled with water ______ because
______________________________.
3. The aluminium foil ______ when it was spread out. When pressed tightly into a ball it __________.
This may have happened because ______________________________.
Answer. 1. The Iron nail sank in the water but the katori floated . I think this happened because the
weight of water displaced by the iron was less than it but the weight of water displaced by the katori was
more than it .
2. The empty plastic bottle floated on water. The bottle filled with water sank because the weight of
water displaced by the empty plastic bottle was more than its weight but the weight of bottle filled with
water was more that of the weight of watered displayed by it.
3. The aluminum foil floated when it was spread out. When pressed tightly into a ball it sank .This may
have happened because the the weight of aluminium foil is than that of water displaced by it but the
weight of aluminium ball is more than that of the water displayed by it.
Page : 62 , Block Name : Think What Would Happen If
Q1 Take some water in a glass. Put a lemon in it. Now keep putting salt in the water, half-a-spoon at a
time. Were you able to float your lemon in water?
Answer. Yes, the lemon starts to float on water.
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Q2 What do you think, the lemon floated In salty water because....
Answer. Because after adding salt, water sticker.
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Q1 Suggest some ways to Hamid for quickly sugar.
Answer. Hamid should follow any of these methods: Stir the mixture thoroughly. Warm the mixture over
a flame.
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Q1 Make groups of four friends. For the experiment you will need 4-5 glasses or bowls or bowls and the
things listed in the table. Take some water 'n each glass. Now try to dissolve one thing in one glass.
Observe that happens and note In the table.
Answer.
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Page : 64 , Block Name : Do This Experiment
Q1 Could you see the salt after It dissolved In water? If no, why?
Answer. No, because salt got dissoIved completely into the water.
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Q2 Does that mean that the water does not have salt? If It has, then where is the salt ?
Answer. Of course, water contains salt. It is completely mixed up with water.
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Q3 What difference did you see In water with salt and water with chalk powder after keeping for some
time?
Answer. Water and salt got mixed together completely while chalk powder settles down at the bottom of
water.
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Q4 Which of the two would you be to separate from the water by straining with a cloth salt or chalk
powder?
Answer. We can chalk powder by straining with a cloth.
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Q5 Do you think the oil dissolved In the water? Why do you think so?
Answer. I do not think so because oil is insoluble in water.
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Q6 You also try to do the same and then which drop went ahead? Why did it slide faster?
Answer. The water drop went ahead. It happens because water does not stick to the Tiffin box but the
sugar and oil drop sticks.
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Q1 One day Ayesha's mother put some water to boil on the stove for making tea. She got busy with
something and forgot about it. When she remembered and came to check, she found only a few drops of
water left in the pan. Think where did the Water go?
Answer. The water evaporated.
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Q2 Why did Chitti Babu and Chinnu Babu keep their mango Jelly in sun?
Answer. They did so to evaporated water from their mango jelly.
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Q3 At your house, what things are made by drying in the sun?
Answer. Eatables like mango jelly (aam papad), papad, badis and potato chips are made by keeping in
the sun.
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Q1 You have washed you handkerchief and you want to dry It quickly. What all can you do?
Answer. For that, first the water from the handkerchief should be squeezed out properly and then should
be kept in the sun or pressed (by iron).
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Q2 What things do you put In water to make tea? Which of these things dissolve in water?
Answer. To make tea, we add milk, tea leaves and sugar into the water. Out of these milk and sugar get
dissolved.
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Q3 You have been given some mishri pieces (lumps of sugar). Suggest some ways
to dissolve them quickly.
Answer. To dissolve the mishri quickly. First it should be crushed to make powder of it. Then after
adding it into water, the mixture should stirred thoroughly. The mixture could also be over the flame to
dissolve the mishri quickly .
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