General Science 7th Class English Medium Chapter 5 Online Test With Answers

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General Science 7th Class English Medium Chapter 5 Online Test

Sr. # Questions Answers Choice
1 On heating sugar changes into Carbon Water Both carbon and water Heat
2 Chemical reaction of oxygen with other substances is called. Oxidation Reduction Rusting None of these
3 Rusting of iron takes place in the presence of. Moisture O2 Both moisture and O2 Dry air
4 Product fo combustion is. C O2 CO2 All of these
5 Compustion is a. Physical Change Chemical change Thermal change None of these
6 Original colur or Nichrome wire is. Silver grey Red hot White hot None of these
7 Zince oxide is ............... solid substances. Red White Yellow Blue
8 Formation of steam from water is example of. Chemical change Physical Change Both of these None of these
9 What happens to water on heating. Evaporates Condense Freez None of these
10 Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as. Combustion Rusting Tarmishing Dehydration
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