Physics MCQs for Class 9 with Answers
Thermal conductivities of Lead
23
30
35
85
Those objects that conduct electricity are:
Conductors
Insulators
Semi conductOrs
None of these
Convention is done by ____________
Vibration of atoms
Actual movement of particles
Same as conduction
Nil
Metals are good conductor of heat due to:
Free electrons
Reamain same
Small size of their molecules
Rapid vibration of their atoms
Light from the sun contain thermal radiation of:
Long wavelength
Short wavelength
Ultra violet rays
Visible light
Air and water is conductor:
Poor
Good
Excellent
None of these
In houses, good thermal insulation means _____________ consumption of fuel:
Lower
Higher
Normal
None
The main source of energy in the unierse is:
Moon
Stars
Sun
Planets
Leslie’s cube is a box of:
Metal
Non-Metal
Wood
Metalloids
In which hot liquid can remains hot:
Glass
Lead
Thermos
Hot pot
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