Q1Written answer
Ayesha put a puffed puri in a bowl of water. Would it sink or float?
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Worked solution
Answer: When puffed puri is put in a bowl of water, it floats.
NCERT · Class 5 · EVS
Chapter 7: Experiments with Water
Practice each question, then open the answer or worked solution.
Questions
6 questionsQ2Written answer
You put a steel plate on water. Would it sink or float? What would happen to a spoon?
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Worked solution
Answer: If you place a steel plate on the water carefully, it will float. When you put the spoon in the water, it sinks.
Q3Written answer
Would the cap of a plastic bottle sink or float on water?
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Worked solution
Answer: The cap of a plastic bottle floats when put in the water since it is plastic.
Q4Written answer
Have you seen that some things float on water while others sink? Think how this happens!
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Worked solution
Answer: It is observed that a few things float and a few sink in the water. If the item put in the water is lighter, it floats. If it is heavier, it sinks. It depends upon the volume of the item.
Do this and find out
Do this experiment in groups of four friends. Each group will need a big pot filled with water and the things listed in the table. Put each thing one-by-one in water and observe. Write your observations in the table given below:
Q1 (2)Written answer
Q1. Mark [✓] for the things that float. Mark [✕] for those that sink.
| Things to be put in water | I guessed before I did it | I saw when I did it |
| (a) Empty bowl (katorl)
(b) After putting in 6-7 small pebbles, one by one. |
X
X |
X
X |
| Iron nail or pin | X | X |
| Matchstick | ✓ | ✓ |
| (a) Empty plastic bottle with its lid closed
(b) bottle half-filled with water (c) bottle full of water |
✓
✓ X |
✓
✓ X |
| Aluminium foil (from medicine packing)
(a) open and spread out (b) pressed tightly into a ball (c) in a cup-like shape |
✓
✓ X ✓ |
✓
✓ X ✓ |
| (a) Soap cake
(b) Soap cake on a small plastic plate |
X
✓ |
X
✓ |
| A piece of ice | ✓ | ✓ |
Q2. Find out from the other groups which things floated and which sank in the water?
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Worked solution
Answer: Things which are heavy usually sink, like metal chains, hammers, steel key chains, etc. Things which are lighter float, like plastic balls, foam balls, etc.
Q3 (2)Written answer
Q3. 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 ____________________________________
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Worked solution
1. The iron nail sank into water, but the katori floated. I think this happened because the iron nail displaced less amount of water than the katori displaced.
2. The empty plastic bottle floated on water. The bottle filled with water sank because the bottle filled with water displaced less amount of water than the empty bottle displaced.
3. The aluminium foil floated when it was spread out. When pressed tightly into a ball, it sank. This may have happened because when pressed tightly into a ball it would have displaced less amount of weight than the aluminium foil spread out.