Physics MCQs for Class 9 with Answers
The brids stretch out their wings and circle in the rising currents of hot air called
conduction
convection
radiation
thermals
Both metals and non-metals transfer:
Electricity
Heat
Both A and B
None of these
Heat can be transmitted form one object to the other by
convection
radiation
conduction
all of these
The earth temperature is :
300 K
200 k
100 K
50 K
The rate at which various surface absorb heat depends upon:
Nature of surface
Nature of liquid
Radiation
Emission & absorption
Feathers of bird give good thermal:
Conduction
Insulation
Convection
None of these
The process in which heat is transfer due to actual movement of molecule is called.
Conduction
radiation
Convection
All of these
Which surface is bad emitter:
White surface
Black surface
Coloured surface
Silver surface
Poor conductor of heat is:
Copper
Aluminium
Water
Iron
Wood, cork,cotton, wool , rubber are the examples of:
Conductor
Thermal conductor
Insulator
Both a & b
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