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Ncert exemplar Solutions Class 6 Science Changes Around Us
Welcome to NCTB Solutions. Here with this post we are going to help 6th class students for the Solutions of NCERT Exemplar Class 6 Science Book, Chapter 6, Changes Around Us. Here students can easily find step by step solutions of all the problems for Changes Around Us, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.
Changes Around Us all Questions Solution :
Question no – (1)
Pick the change that can be reversed from the following
Answer :
The correct answer is option – (b)
Melting of ghee can be reversed.
Question no – (2)
Which of the following change cannot be reversed?
Answer :
The correct answer is option – (a)
Hardening of cement cannot be reversed.
Question no – (3)
An iron ring is heated. Which of the following statement about it is incorrect?
Answer :
The correct answer is option – (d)
The ring changes its shape and the change cannot be reversed.
Question no – (4)
While lighting a candle, Paheli observed the following changes
Answer :
The correct answer is option – (d) (i) and (iv)
Paheli will observed the Wax was melting and Melted wax was getting solidified.
Question no – (5)
Salt can be separated from its solution (salt dissolved in water), because
Answer :
The correct answer is option – (d)
Because, mixing of salt in water is a change that can be reversed by evaporation.
Question no – (6)
Rolling of chapati and baking of chapati are the changes that
Answer :
The correct option is – (c)
Rolling of chapati and baking of chapati are the changes that can be reversed and cannot be reversed, respectively.
Question no – (7)
Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim
Answer :
The correct option is – (d)
Because on heating the iron rim expands first, then on cooling contracts and fits onto the wooden wheel.
Very Short Answer Questions :
Question no – (8)
Answer :
Melting of wax is an reversible change because it is possible to get back to the original wax.
A burning candle and an extinguished candle are both examples of an irreversible change as it is now impossible to get back the original material.
Question no – (9)
Answer :
A reversible change is observed in this process.
Question no – (10)
Answer :
After immersing the metal cap for 5 minutes the metal cap expanded causing it to loose grip of the bottle. That’ s how Paheli was able to remove the lid.
Short Answer Questions :
Question no – (11)
Answer :
(a) Water into water vapour
Yes , we can reverse the change by condensation process.
(b) Water vapour into water
Yes , we can reverse the change by evaporation process.
(c) Ice into water
Yes, we can reverse the change by freezing process.
(d) Curd into milk
No , we can’t reverse the change by any process.
Question no – (12)
Answer :
(a) Blowing of a balloon can be Reversed
(b) Folding a paper to make a toy aeroplane can be Reversed.
(c) Rolling a ball of dough to make roti can not be reversed
(d) Baking cake in an oven can not be reversed.
(e) Drying a wet cloth can be Reversed
(f) Making biogas from cow dung can not be reversed.
(g) Burning of a candle can not be reversed.
Question no – (13)
Answer :
No, Boojho will not be successful in his effort because ‘plaster of paris’ once molded into a shape changes its physical form and can’t be reversed back.
Question no – (14)
Answer :
Paper recycling is still an irreversible change because after recycling we get a new page which is different in texture, shape and size.
Long Answer Questions :
Question no – (15)
Answer :
(a) Change which occurs on heating but can be reversed
Example : heating an iron or steel rod.
(b) Change which occurs on heating but cannot be reversed
Example : Baking a pizza
(c) Change which occurs on cooling but can be reversed
Example : Forming ice.
(d) Change which occurs on mixing two substances, but can be reversed
Example : Forming sugar water solution.
(e) Change which occurs on mixing two substances, but cannot be reversed
Example : Mixture of plaster of paris and water.
Question no – (16)
Answer :
These two actress leads to different types of changes over of them is reversible white the other is not. Shaping the clay is an reversible change since the clay can be brought back to its original form whereas baking of clay isn’t an irreversible change since it can’t be brought back to its original form.
Question no – (17)
Answer :
The other four examples where change can be reversed are –
• Melting of ice.
• Freezing of water.
• Inflation of a balloon.
• Folding of a paper.
Question no – (18)
Answer :
The other four examples of irreversible change are as follows
• Baking of a cake.
• Mixing cement with water.
• Cutting paper into Aeroplanes.
• Burning of a matchstick.
Question no – (19)
Answer :
The changes that can be reversed are :
• rolled the dough to make a Chapati.
The changes that can’t be reversed are :
• made a dough.
• baked the chapati on a pan.
• dried the chapati and ground it in a grinder to make powder.
Question no – (20)
Answer :
Reversible changes are :
• Simba blew balloons and put them on the wall
• She also made some flowers by origami (paper folding) to decorate the house.
• Her father made dough balls
• Mother rolled the dough balls to make puries
• Mother heated oil in a pan.
Irreversible changes are :
• Some of the balloons got burst.
• Paheli cut colorful strips of paper and put them on the wall with the help of tape.
• Father fried the puries in hot oil.
Next Chapters Solution :
👉 Food : Where Does It Come From?
👉 Sorting Materials and Groups
👉 The Living Organisms and their Surroundings
👉 Motion and Measurement of Distances
👉 Light
👉 Water
👉 Garbage in, Garbage out
