Physics MCQs for Class 9 with Answers
The substances through which heat does not conduct:
Conductors
Bad conductors
Insulators
Both B and C
Room are heated using gas heaters by:
Conduction only
Convection and radiation
Radiation only
Convection only
Thermal conductivity of iron is Wm-1 K-1
85
36
89
86
Feathers of bird give good thermal:
Conduction
Insulation
Convection
None of these
Leslie’s cube is filled with
Cold water
Hot water
Mercury
Air
All ________ conduct heat easily:
Non metals
Gases
Material
Metals
Land and sea breezes are the result of:
Absorption
Radiation
Conduction
Convection
The transfer of heat by vibrating molecules in solids :
Conduciton
Radiation
Convection
None
The insulator of heat is:
Cork
Cotton
Wood
All
Heat reflected form the body depends upon :
Colour and form
Form and speed
Color and speed
None
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