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Online Tests
Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers
Question # 1
Unit of thermal conductivity is .
Choose an answer
Wmk
W m
-1
K
-1
Wm
None of these
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Question # 2
Land and sea breezes are the result of:
Choose an answer
Absorption
Radiation
Conduction
Convection
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Question # 3
Which surface is best reflector of heat?
Choose an answer
dull black surface
coloured surface
white surface
shining slivered surface
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Question # 4
On heating Air becomes.
Choose an answer
Heavier
Lighter
Remain same
None
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Question # 5
Example of bad conductor is:
Choose an answer
Wool
Iron
Graphite
Gold
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Question # 6
Those objects which do not conduct electricity are called.
Choose an answer
Insulator
Semi conductor
Nil
Conduct
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Question # 7
Transfer of heat by actual movement of molecules form hot place to cold place is called:
Choose an answer
Conduction
Convection
Radiation
None
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Question # 8
Air and water is conductor:
Choose an answer
Poor
Good
Excellent
None of these
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Question # 9
What happens to the thermal conductivity of a wall if its thickness is doubled?
Choose an answer
Become double
Remain the same
Become half
Become one fourth
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Question # 10
____________ is bad conductors of heat:
Choose an answer
Copper
Water
Wire
Nil
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Question # 11
Rooms are heated using gas heaters by
Choose an answer
Conduction only
Convection and radiation
Radiation only
Convection only
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Question # 12
Rooms are heated using gas heater by:
Choose an answer
Conduction only
Convection and radiation
Radiation only
Convection only
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Question # 13
In large building central heating system worms on the principle of
Choose an answer
conduction
convection
radiation
waves
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