Answer:- Three forms of water are : Solid ( ice ), Liquid ( water ) and Gas ( gaseous ).
Question 2. Which gases mix to form water?
Answer: Oxygen and Hydrogen gases mix to form water.
Question 1. Fill in the blanks : (three, blue, cloud, ice)
(a) Water has three forms.
(b) Evaporated water becomes a cloud.
(c) Because of water, earth is called a blue planet.
(d) Solid form of water is called ice.
Question 2. Tick (✓) the correct and cross (✗) the wrong sentences :
(i) Condensed water changes into vapour. ( × )
(ii) Pure water has no colour. ( ✓ )
(iii) In old days many people were not allowed to get water due to caste-based discrimination.
( ✓ )
(iv) Water cycle goes on continuously. ( ✓ )
Question 3. Tick (✓) the correct answers :
(a) At what temperature does water turn into ice?
(a) 40°C (b) o°c ( ✓ ) (c) 100°C
(b) What is the %age of water on earth?
(a) 60% (b) 50% (c) 70% ( ✓ )
(c) What dissolves into water?
(a) Salt. ( ✓ ) (b) Sand (c) Stones
(d) What does not sink into water 7
(a) Iron (b) Stones (c) Wood. ( ✓ )
(e) Which gas mixes with oxygen to form water?
(a) Carbon dioxide (b) Nitrogen (c) Hydrogen. ( ✓ )
Question 4. Write the name of three things that sink into water.
Answer: Stone, iron, sand.
Question 5. Write the name of three things that float on water.
Answer: Plastic, wood, thermocol.
Question 6. Write the names of three things that dissolve into water.
Answer: Salt, sugar, milk.
Question 7. List the properties of pure water.
Answer: 1. Pure water has no colour .
2. It has no taste.
3. It has no smell
4. It has no shape.
Question 8. What is water cycle? Explain with a figure.
Answer: All the water sources like sea, rivers, lakes, canals, ponds etc. get heated with sunlight . Water evaporates and vapours make clouds. From clouds water falls back on the earth in the form of rain, hails and snow. It flow back to the oceans and lakes through rivers. This is called water cycle.
Question 9. How can the dissolved salt be separated from water?
Answer: Mix two spoons of salt in water and boil until all the water evaporates and only salt remains in the container.
Question 10. What is evaporation? Give some examples.
Answer: Evaporation is the process in which a liquid or solid form of water converted into vapour. Like drying a floor after wipe , drying clothes, etc.
Question 11. When does a thing float on water?
Answer: When things or objects displace more water than their weight, things float on water.
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