Login
Login
Sign up
Start
Mathmania
Teacher tutorials
TOP
Subjects
Bridge Course
Testworks
Subject updates
Ya+
News
Send feedback
See more
Contacts
About Us
Terms and Conditions
Privacy Policy
PDF chapter test
TRY NOW
Subjects
Science CBSE
Class 7
Physical and chemical changes
Types of changes in chemistry
1.
Choose the correct answer
Exercise condition:
3
m.
1
.
Rusting of iron can be prevented by __________.
Crystallisation
Exposure to air
Coating with paint or grease
Exposure to water
2
.
Boiled rice is an example of __________.
rusting
crystallisation
chemical change
physical change
3
.
Burning is accompanied by __________.
heat
smoke
none of the above
both smoke and heat
Login
or
Fast registration
Previous theory
Exit to the topic
Next exercise
Send feedback
Did you find an error?
Send it to us!