Physics MCQs for Class 9 with Answers Chapter 9

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Metals are good conductors of heat due to :
Free electrons
Big size of molecules
Small size of molecules
None of these

A Leslie cube is use to identify :
Radiation
Conduction
Convection
Both A and B

The conduction is due to:
They have high boiling point
Vibration of atoms
They have high melting point
None of above

Dull black surface is a best:
Emitter
Absorber
Reflector
None of these

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

All are conductors except:
Copper
Wires
Steel
Wood

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

The SI unit of thermal conductivity is
Wm K-1
Wm-1K
Wm-1K -1
WmK

Land breeze from land to sea during:
Day
Night
Afternoon
Morning

……………. causes coastal breeze.
Conduction
Convection
Radiation
Nil

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