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Online Tests
Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers
Question # 1
Transfer of heat by the actual movement of molecules from one place to the other is called 
Choose an answer
conduction
convection
radiation
waves
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Question # 2
The main source of energy n the universe is:
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Moon
Stars
Sun
Planets
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Question # 3
Rooms are heated using gas heater by:
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Conduction only
Convection and radiation
Radiation only
Convection only
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Question # 4
The quantity of heat absorbed by the body depends upon:
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Colour of surface
Nature of surface
Shape of surface
Both a and b
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Question # 5
A black dull surface is a good ________ of heat:
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Emitter
Absorber
Reflector
Both A and B
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Question # 6
Wood, cork,cotton, wool , rubber are the examples of:
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Conductor
Thermal conductor
Insulator
Both a & b
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Question # 7
The SI unit of thermal conductivity is
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Wm K-1
Wm-1K
Wm-1K -1
WmK
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Question # 8
Which one box is used to keep food hot and ice cream cold for long period?
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Iron box
Aluminium Box
Styrofoam box
Plastic box
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Question # 9
Glass and transparent polythene sheets allow radiations of wavelength to pass through them:
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Long
Medium
Short
All
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Question # 10
Which surface is best reflector of heat?
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dull black surface
coloured surface
white surface
shining slivered surface
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Question # 11
Shining silvered surface is a best:
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Emitter
Absorber
Reflector
None of these
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Question # 12
Metals are good conductor of heat due to
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Free Electrons
Big size of their molecules
Small size of their molecules
Rapid vibrations of their atoms
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Question # 13
In solid, heat is transferred by:
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Radiation
Conduction
Convection
Absorption
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