Physics MCQs for Class 9 with Answers
Leslie’s cube is filled with
Cold water
Hot water
Mercury
Air
The SI unit of thermal conductivity is
Wm K-1
Wm-1K
Wm-1K -1
WmK
Convection of heat is the process of heat transfer due to the
Random motion of molecules
Downward movement of molecules
Upward movement of molecules
Free movement of molecules
Falls ceiling is done to:
Lower the height of ceiling
Keep the roof clean
Cool the room
Insulate the ceiling
The temperature of a black dull surface on heating :
Rise Rapidly
Fall Rapidly
Becomes zero
Remain constant
In solids, Heat is transferred by:
Radiation
Conduction
Convection
Absorption
The bad conductor of Heat is:
Iron
Copper
Air
Aluminium
Radiation are emited by:
Cold body
Hot body
All bodies
None
Thermal conductivity of iron is Wm-1 K-1
85
36
89
86
Land and sea breezes are the result of:
Absorption
Radiation
Conduction
Convection
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