2. State whether this change can be reversed or not.
(c) Rolling a ball of dough to make roti.
(g) Burning of a candle.
(b) Folding a paper to make a toy aeroplane.
4 (c). Paheli mixed flour and water made dough, rolled the dough to make chapati and baked the chapati on a pan. Identify the change whether it can be reversed or not.
(f) Making biogas from cow dung.
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