Qn. 6 - Give two examples for the following
1.Applicaion of expansion
- 2.physical changes
3.Irreversible changes
Answers
Explanation:
1. Railway lines. Railway lines are fixed with gaps to allow for expansion when temperature rises. ...
Telephone/electricity wires. ...
Steam pipes. ...
Steel bridges. ...
Rivets. ...
Thermostat.
2. Examples of Physical Changes
Crushing a can.
Melting an ice cube.
Boiling water.
Mixing sand and water.
Breaking a glass.
Dissolving sugar and water.
Shredding paper.
Chopping wood.
3. Some examples of irreversible changes are burning of paper, Burning of fuels (like Wood, Coal and LPG), Cooking of food, Rusting of iron , Grinding of wheat grains into flour, Baking of chapatti (roti), Growth of a plant, Formation of flower from bud, Falling of leaves from a tree, Ripening of fruits, Ageing of man
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Answer:
1))Expansion of railway track in hot weather and expansion of metal bottle cap on heating.
2((Crushing a can.
Melting an ice cube.
3))burning of paper, Burning of fuels
Explanation: