Physics MCQs for Class 9 with Answers Chapter 8

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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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