Physics MCQs for Class 9 with Answers
____________ is bad conductors of heat:
Copper
Water
Wire
Nil
Central heating systems in buildings operate by
Conduction
Radiation
Convection
Condensation
Thermos flask, is used to maintain:
Heat
Temperature
Density
Pressure
A black dull surface is a good ________ of heat:
Emitter
Absorber
Reflector
Both A and B
Unit of thermal conductivity is .
Wmk
W m-1 K-1
Wm
None of these
Which is expert thermal climber:
Crow
Sparrow
Hawks
None
Transfer of heat by actual movement of molecules form hot place to cold place is called:
Conduction
Convection
Radiation
None
The sun’s surface temperature is :
3,000 K
3,030 k
6,000 K
600 K
At night , the air from land to begins towards sea called:
Land breeze
Sea breaze
Both A and B
Radiation
Which one box is used to keep food hot and ice cream cold for long period?
Iron box
Aluminium Box
Styrofoam box
Plastic box
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