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Online Tests
General Science 7th Class English Medium Chapter 5 Online Test MCQs With Answers
Question # 1
A gas produced on heating solid potassium chlorate is.
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Hydrogen
Carbon dioxide
Oxygen
Methane
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Question # 2
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 # 3
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 # 4
Freezing of a liquid is a
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Chemical change
Chemicla property
Physical change
None of these
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Question # 5
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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Question # 6
On heating sugar changes into
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Carbon
Water
Both carbon and water
Heat
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Question # 7
Original colur or Nichrome wire is.
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Silver grey
Red hot
White hot
None of these
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Question # 8
A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is.
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Iron oxide
Iron sulphide
Iron Chloride
Iron Hydride
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Question # 9
Zince oxide is ............... solid substances.
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Red
White
Yellow
Blue
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Question # 10
Compustion is a.
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Physical Change
Chemical change
Thermal change
None of these
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