Physics MCQs for Class 9 with Answers
What gas behaves as glass or polythene to radiation:
Nitrogen
Hydrogen
Carbon di oxide
Methane
In which hot liquid can remains hot:
Glass
Lead
Thermos
Hot pot
How does heat reaches form sun to earth through?
Conduciton
Convection
Radiation
None
Glass and transparent polythene sheets allow radiations of wavelength to pass through them:
Long
Medium
Short
All
What happens to the thermal conductivity of a wall if its thickness is doubled?
Become double
Remain the same
Become half
Become one fourth
Example of bad conductor is:
Wool
Iron
Graphite
Gold
All ________ conduct heat easily:
Non metals
Gases
Material
Metals
All bodies absorb or emit energy by
convection
radiation
conduction
both (a) & (c)
Wood, cork,cotton, wool , rubber are the examples of:
Conductor
Thermal conductor
Insulator
Both a & b
In large building central heating system worms on the principle of
conduction
convection
radiation
waves
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