Available Answers

1. 1.

   Tick the correct options :

   1. Which of the following is /are natural change (s)?
      1. formation of glaciers
      2. weathering of rocks
      3. ripening of fruits 
      4. all of these
   2. Melting of ice is a ________________ change.
      1. reversible
      2. irreversible
      3. chemical
      4. fast
2. 2.

   Tick (√) the correct  options:

   1. How do changes occur?
      1. by cooling 
      2. by heating
      3. by applying pressure
      4. all of these
   2. When does an object expends?
      1. on cooling
      2. on heating
      3. on applying pressure
      4. all of these
3. 3.

   Tick (√) the correct options:

   1. Burning of coal is a/an ________________ change.
      1. reversible
      2. irreversible
      3. natural
      4. quick
   2. Which of the following is not an irreversible change?
      1. ripening of fruits
      2. baking of cake
      3. blooming of flowers
      4. contradiction of metals
   3. Occurrence of day and night is an example of ________________ ..
      1. reversible change
      2. natural change
      3. human-made change
      4. manual change
   4. On applying force on the spring by hanging a weight, we see the length of the spring.________________.
      1. increases
      2. decreases
      3. remains the same
      4. gets doubled
   5. We add a spoonful of ________________ in the warm milk to obtain curd.
      1. cold milk
      2. sugar
      3. honey
      4. curd
   6. Formation of glacier is an example of ________________.
      1. human-made change
      2. natural change
      3. human-made and reversible change
      4. natural and irreversible change
   7. When ice melts to water,then a change occurs in its ________________.
      1. temperature
      2. state
      3. position
      4. composition
   8. Which of the following is a reversible change?
      1. water changing into ice
      2. nails becoming rusty
      3. paper burning into ash
      4. seed growing into seeding
4. 4.

   Fill in the blanks:

   1. The changes that can be reversed are called ________________ changes.
   2. Ripening of fruits is an example of ________________ change.
   3. Freezing of water is an example of ________________ change.
   4. ________________ causes water to change into steam.
   5. Beating of heart is an example of ________________ change.
   6. Materials ________________ on heating and ________________ on cooling.
   7. Stretching of spring is ________________ change.
5. 5.

   Match the following:

   Column  A	Column B
   1. Grinding wheat to flour	a. reversible change
   2. Cooling or heating	b. irreversible change
   3. Fixing of iron rim on wooden wheel	c. natural change
   4. Stretching of rubber band	d. change in state
   5. Flowering in plants	e. takes place  due to expansion and contradiction

    

6. 6.

   What happens when an iron rim is heated?