NCERT solution for class 6// Science // Chapter 6 - Changes around us

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NCERT solution for class 6// Science // Chapter 6 - Changes around us

Q1. To walk through a waterlogged area you usually shorten the length of your dress by folding it can this change be reversed ?

Answer- Yes this change can be reversed

Q2. You accidentally dropped your favourite toy and broke it this is a change you did not want can this change be reversed ?

Answer -  No this cannot be reversed change because it is permanent change

Q3. Some changes are listed in the following table for each change write the blank column where the change can be reversed or not 

Change                                   

 

Can be reversed yes /no 

 

The sawing of a piece of wood

 

The melting of ice candy

 

Dissolving sugar in water

 

The cooking of food .-

 

Ripening of a mango .

 

Souring of milk    

 









Answer 

Change                                   

 

Can be reversed yes /no 

 

The sawing of a piece of wood

 No

The melting of ice candy

 Yes

Dissolving sugar in water

 No

The cooking of food .-

 No

Ripening of a mango .

 No

Souring of milk    

 No









Q4. A drawing sheet changes when you draw a picture on it can you reverse this change 

Answer -Yes this change can be reversed when you erase the drawing

Q5. Give example to explain the difference between changes that can or cannot be reversed 

Answer- Changes can be reversed 

  • Folding of paper 
  • Knitting of sweater 
  • Rolling of Chapati from dough

Changes that cannot be reversed 

  • Making of curd from milk 
  • Cooking of food 
  • Ripening of fruit

Q6. Thick coating of a paste of plaster of paris is applied over the bandage on a fractured bone it becomes hard on trying to keep the factored bones immobilized can the change in pop be reversed 

Answer -  No Harding of plaster of paris is a permanent change its cannot be reversed 

Q7. A bag of cement laying in open gets wet due to rain during the night the next day the sun shine brightly do you think that change which have occurred in cement could be reversed 

Answer - No that change occured in cement is the permanent change and it cannot be reversed

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