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9th Class Physics Chapter 9 Transfer of Heat English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
Land breeze from land to sea during:
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Day
Night
Afternoon
Morning
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Question # 2
In gases, heat is mainly transferred by
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Molecular collision
Conduction
Convection
Radiation
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Question # 3
Convection of heat is a process of heat transfer due to;
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Random motion of molecules
Downward motion of molecules
Upward motion of molecules
Free motion of molecules
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Question # 4
Poor conductor of heat is:
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Copper
Aluminium
Water
Iron
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Question # 5
There are ______ modes of transfer of heat:
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1
2
3
4
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Question # 6
The radiation from sun is:
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Alpha
Gamma
Radio
Ultraviolet
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Question # 7
Which one box is used to keep food hot and ice cream cold for long period?
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Iron box
Aluminium Box
Styrofoam box
Plastic box
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Question # 8
The insulator of heat is:
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Cork
Cotton
Wood
All
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Question # 9
Which of the following is a good radiator of heat?
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A shining slivered surface
A dull black surface
A white surface
A green coloured surfaced
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Question # 10
Metals are good conductors of heat due to :
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Free electrons
Big size of molecules
Small size of molecules
None of these
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Question # 11
The process in which heat is transmitted form one body to another by the interaction of atoms and the movement of free electrons is known as
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convection
radiation
conduction
both (a) and (b)
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Question # 12
Heat form one of a metal rod a reaches to the other by the process of
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convection
radiation
conduction
both (a) and (b)
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Question # 13
All bodies absorb or emit energy by
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convection
radiation
conduction
both (a) & (c)
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Question # 14
Which one is a good conductor?
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cotton
air
wool
iron
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Question # 15
Thermal conductivities of Lead
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23
30
35
85
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Question # 16
In solids, Heat is transferred by:
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Radiation
Conduction
Convection
Absorption
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Question # 17
Dull black surface is a best:
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Emitter
Absorber
Reflector
None of these
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Question # 18
Heat reflected form the body depends upon :
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Colour and form
Form and speed
Color and speed
None
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Question # 19
Leslie's cube is a box of:
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Metal
Non-Metal
Wood
Metalloids
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