Physics MCQs for Class 9 with Answers
A silvery white surface is a :
Worst reflector
Best reflector
Worst absorber
Best absorber
The radiation from sun is:
Alpha
Gamma
Radio
Ultraviolet
If heat Q flows in time ‘t’ through some metal then rate of flow of heat is defined as
Flow of heat = 2Qt
Flow of heat = Q/t
Flow of heat = t/Q
Flow of heat = Qt
Air and water is conductor:
Poor
Good
Excellent
None of these
Shining silvered surface is a best:
Emitter
Absorber
Reflector
None of these
Poor conductor of heat is:
Copper
Aluminium
Water
Iron
Which one box is used to keep food hot and ice cream cold for long period?
Iron box
Aluminium Box
Styrofoam box
Plastic box
During recent years the percentage of __________ increased considerably on earth:
Carbon dioxide
Nitrogen
Oxygen
Methane
Which of the following is an insulator?
Wood
Glass
Plastic
Steel
The conduction is due to:
They have high boiling point
Vibration of atoms
They have high melting point
None of above
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