Question 19

Paheli mixed flour and water and (a) made a dough, (b) rolled the dough to make a chapatti, (c) baked the chapatti on a pan, (d) dried the chapatti and ground it in a grinder to make powder. Identify the changes (a) to (d) as the changes that can be reversed or that cannot be reversed.

Open in App

Solution

Made a dough - this change be reversed
Rolled the dough to make a chapatti - This change can be reversed.
Baked the chapatti on a pan - this change cannot be reversed.
Dried the chapatti and ground it in a grinder to make powder - this change cannot be reversed.

Suggest Corrections

Similar questions

Question 6

Rolling of chapatti and baking of chapatti are the changes that
(a) can be reversed
(b) cannot be reversed
(c) can be reversed and cannot be reversed, respectively
(d) cannot be reversed and can be reversed, respectively

Q. Question 9

A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough.

Question 20

It was Paheli's birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli's home:
(a) Simba blew balloons and put them on the wall.
(b) Some of the balloons got burst.
(c) Paheli cut colourful strips of paper and put them on the wall with the help of tape.
(d) She also made some flowers by origami (paper folding) to decorate the house.
(e) Her father made dough balls.
(f) Mother rolled the dough balls to make puries.
(g) Mother heated oil in a pan.
(h) Father fried the puries in hot oil.
Identify the activities at Paheli's home, as those that can be reversed and those, which cannot be reversed.

Question 12

Which of the following changes cannot be reversed?
Blowing of a ballon
Folding a paper to make a toy aeroplane
Rolling a ball of dough to make roti
Baking cake in an oven
Drying a wet cloth
Making biogas from cow dung
Burning of a candle

Question 5

Salt can be separated from its solution (salt dissolved in water) because
(a) mixing of salt in water is a change that can be reversed by heating and melting of salt
(b) mixing of salt in water is a change that cannot be reversed
(c) mixing of salt in water is a permanent change
(d) mixing of salt in water is a change that can be reversed by evaporation

Join BYJU'S Learning Program

Question 19 Paheli mixed flour and water and (a) made a dough, (b) rolled the dough to make a chapatti, (c) baked the chapatti on a pan, (d) dried the chapatti and ground it in a grinder to make powder. Identify the changes (a) to (d) as the changes that can be reversed or that cannot be reversed.

Made a dough - this change be reversed Rolled the dough to make a chapatti - This change can be reversed. Baked the chapatti on a pan - this change cannot be reversed. Dried the chapatti and ground it in a grinder to make powder - this change cannot be reversed.

Question 19

Paheli mixed flour and water and (a) made a dough, (b) rolled the dough to make a chapatti, (c) baked the chapatti on a pan, (d) dried the chapatti and ground it in a grinder to make powder. Identify the changes (a) to (d) as the changes that can be reversed or that cannot be reversed.

Made a dough - this change be reversed
Rolled the dough to make a chapatti - This change can be reversed.
Baked the chapatti on a pan - this change cannot be reversed.
Dried the chapatti and ground it in a grinder to make powder - this change cannot be reversed.