Available Answers

1. 1.

   Choose the correct option.

   1. Khadi is obtained from
      1. flax
      2. hemp
      3. coconut
      4. cotton
   2. Coir is obtained from
      1. flax
      2. hemp
      3. coconut
      4. cotton
   3. Miscible in water
      1. oxygen
      2. kerosene
      3. coconut oil
      4. chalk
   4. A reversible change
      1. cooking of food
      2. blowing a balloon
      3. curdling of milk
      4. ripening of fruit
   5. An irreversible change
      1. cooking of food
      2. blowing a balloon
      3. freezing of water
      4. melting of ice
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   Answer:

   S A M P L E

   1. (d) cotton
   2. (c) coconut
   3. (b) kerosene
   4. (b) blowing a balloon
   5. (a) co
2. 2.

   Write T for the true statement and F for the false one. Correct the false statement(s).

   1. Silk cotton is obtained from silk and cotton plants.
   2. Sandpaper is smooth to touch.
   3. Liquids that do not dissolve in water are called immiscible in water.
   4. Plastic is an insulator.
   5. Tearing a paper is a chemical change.
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   Answer:

   S A M P L E

   1. F Silk comes from silkworms, cotton from cotton plants.
   2. F San
   3. ...
   4. ...
   5. F Tearing ...
3. 3.

   What is an insulator of heat? Give two examples of insulators of heat.

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   Answer:

   S A M P L E

   An insulator of heat is a material that does not allow heat ...

4. 4.

   Give an example of an irreversible change.

5. 5.

   Differentiate between physical and chemical changes using examples.

6. 6.

   How are jute fibres obtained?