Physics MCQs for Class 9 with Answers
The mathematical formula of thermal conductivity is
k =Q/t x L/A (T1 – T2)
k =Q/t x L/A (T1 + T2)
k =t/Q x L/A (T1 – T2)
k =2Q/t x L/A (T1 + T2)
Metals are good conductor of heat due to:
Free electrons
Reamain same
Small size of their molecules
Rapid vibration of their atoms
Anything kept in thermos :
In temperature remain constant
Its temperature decrease
Its temperature increase
None of these
Convention is done by ____________
Vibration of atoms
Actual movement of particles
Same as conduction
Nil
____________ from sun are major source of energy on earth.
Light
Radiation
Both a & b
None of these
Larger is the area greater will be:
Radiation
Transfer of heat
Evaporation
Conduction of heat
See breeze blows form sear to land during:
day
night
after noon
morning
Those objects which do not conduct electricity are called.
Insulator
Semi conductor
Nil
Conduct
Metals are good conductors of heat due to :
Free electrons
Big size of molecules
Small size of molecules
None of these
The example of bad conductor is:
Wool
Copper
Gold
Iron
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