Q15. A bag of cement lying outside in the open got wet due to heavy rain. Can we reverse the change occurred to the cement by placing it under the sun?

 

Q16. How iron articles of different shapes and sizes are made?

 

Q17. How setting of curd an irreversible change?

 

Q18. Is burning of incense stick an irreversible change?

 

Q20. Why a candle reduces in size on burning? What kind of change it is?

 

Q21. Why is metal rim heated before fixing on to wooden cart wheel?

 

Q22. Differentiate between slow and fast change.

 

Q23. What kind of change is the formation of clouds?

 

Q24. How is frying a puri different from rolling a puri?

 


Last modified: Thursday, 3 January 2019, 10:14 PM