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Online Tests
Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers
Question # 1
The quantity of heat absorbed by the body depends upon:
Choose an answer
Colour of surface
Nature of surface
Shape of surface
Both a and b
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Question # 2
Which surface is bad emitter:
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White surface
Black surface
Coloured surface
Silver surface
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Question # 3
Conduction on heat occur at ________ rate in materials
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Different
Same
Both A and B
None
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Question # 4
Dull black surface is a best:
Choose an answer
Emitter
Absorber
Reflector
None of these
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Question # 5
Feathers of bird give good thermal:
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Conduction
Insulation
Convection
None of these
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Question # 6
The earth temperature is :
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300 K
200 k
100 K
50 K
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Question # 7
Which is expert thermal climber:
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Crow
Sparrow
Hawks
None
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Question # 8
See breeze blows form sear to land during:
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day
night
after noon
morning
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Question # 9
In solid, heat is transferred by:
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Radiation
Conduction
Convection
Absorption
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Question # 10
Example of bad conductor is:
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Wool
Iron
Graphite
Gold
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Question # 11
Unit of thermal conductivity is .
Choose an answer
Wmk
W m
-1
K
-1
Wm
None of these
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Question # 12
In which hot liquid can remains hot:
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Glass
Lead
Thermos
Hot pot
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Question # 13
Poor conductor of heat is:
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Copper
Aluminium
Water
Iron
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Question # 14
Land breeze from land to sea during:
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Day
Night
Afternoon
Morning
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Question # 15
The main source of energy n the universe is:
Choose an answer
Moon
Stars
Sun
Planets
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Question # 16
If heat Q flows in time 't' through some metal then rate of flow of heat is defined as
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Flow of heat = 2Qt
Flow of heat = Q/t
Flow of heat = t/Q
Flow of heat = Qt
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Question # 17
In gases, heat is mainly transferred by
Choose an answer
Molecular collision
Conduction
Convection
Radiation
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Question # 18
Glass and transparent polythene sheets allow radiations of wavelength to pass through them:
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Long
Short
Medium
All
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Question # 19
Glider pilots use __________ movement of hot air currents due to convection of heat:
Choose an answer
Downward
Upward
Left
right
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