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Online Tests
Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers
Question # 1
The substances through which heat does not conduct:
Choose an answer
Conductors
Bad conductors
Insulators
Both B and C
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Question # 2
A black dull surface is a good ________ of heat:
Choose an answer
Emitter
Absorber
Reflector
Both A and B
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Question # 3
Good conductor is :
Choose an answer
Air
Wood
Iron
None
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Question # 4
Light from the sun contain thermal radiation of:
Choose an answer
Long wavelength
Short wavelength
Ultra violet rays
Visible light
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Question # 5
Leslie's cube is filled with
Choose an answer
Cold water
Hot water
Mercury
Air
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Question # 6
Metals are good conductor of heat due to:
Choose an answer
Free electrons
Reamain same
Small size of their molecules
Rapid vibration of their atoms
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Question # 7
The brids stretch out their wings and circle in the rising currents of hot air called
Choose an answer
conduction
convection
radiation
thermals
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Question # 8
The SI unit of thermal conductivity is
Choose an answer
Wm K-1
Wm-1K
Wm-1K -1
WmK
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Question # 9
In which hot liquid can remains hot:
Choose an answer
Glass
Lead
Thermos
Hot pot
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Question # 10
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 # 11
Example of bad conductor is:
Choose an answer
Wool
Iron
Graphite
Gold
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Question # 12
The example of bad conductor is:
Choose an answer
Wool
Copper
Gold
Iron
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Question # 13
Heat form one of a metal rod a reaches to the other by the process of
Choose an answer
convection
radiation
conduction
both (a) and (b)
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Question # 14
A silvery white surface is a :
Choose an answer
Worst reflector
Best reflector
Worst absorber
Best absorber
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Question # 15
____________ from sun are major source of energy on earth.
Choose an answer
Light
Radiation
Both a & b
None of these
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Question # 16
Thermos flask, is used to maintain:
Choose an answer
Heat
Temperature
Density
Pressure
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Question # 17
Land and sea breezes are the result of:
Choose an answer
Absorption
Radiation
Conduction
Convection
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Question # 18
More radiation is reflected by the surface.
Choose an answer
White
Coloured
Black
Rough
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Question # 19
Rooms are heated using gas heater by:
Choose an answer
Conduction only
Convection and radiation
Radiation only
Convection only
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