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General Science 7th Class English Medium Chapter 5 Online Test MCQs With Answers
Question # 1
Chemical reaction of oxygen with other substances is called.
Choose an answer
Oxidation
Reduction
Rusting
None of these
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Question # 2
Zince oxide is ............... solid substances.
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Red
White
Yellow
Blue
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Question # 3
The temperature at which a liquid's vapour pressure is equal to the external pressure surrounding the liquid is.
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Melting point
Boiling point
Freezing point
Highest temperature.
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Question # 4
Product fo combustion is.
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C
O2
CO2
All of these
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Question # 5
Rusting of iron takes place in the presence of.
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Moisture
O2
Both moisture and O2
Dry air
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Question # 6
Freezing of a liquid is a
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Chemical change
Chemicla property
Physical change
None of these
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Question # 7
Silver+ hydrogen suolphide+Oxygen--------------- Silver sulphide + water The above reaction is known as.
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Combustion
Rusting
Tarmishing
Dehydration
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Question # 8
Sajeet the one that is different from the otehrs.
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Solubility
Conductance
Oxidation
Coiling of a substance
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Question # 9
On heating sugar changes into
Choose an answer
Carbon
Water
Both carbon and water
Heat
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Question # 10
What are teh products when electric current is passed through water.
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Only steam
Hydrogen and steam
Hydrogen and oxygen
Oxygen and steam
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