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Physics 9 Chapter 9 - Transfer of Heat - 12
1.
What is the mode of transfer of heat from one place to another in the form of electromagnetic waves?
a) Radiation
b) Electromagnetic waves
c) Conduction
d) Convection
2.
By which process, heat directly reaches us from a fireplace?
a) Convection
b) Conduction
c) Radiation
d) Electromagnetic waves
3.
Why heat does not reach us through the air from a fireplace by conduction?
a) Because air is a poor conductor of heat
b) Because air is a good conductor of heat
c) Because fireplace is a poor conductor of heat
d) Because fireplace is a good conductor of heat
4.
Rooms are heated using gas heaters by.....................?
a) Conduction only
b) Convection and radiation
c) Radiation only
d) Convection only
5.
By which process, heat energy from the fireplace reaches us?
a) Convection
b) Conduction
c) Radiation
d) Electromagnetic waves
6.
What are emitted by all bodies?
a) Heat
b) Radiations
c) Water
d) Light
7.
Upon which of the following radiations emitted by a body depends?
a) Surface temperature
b) Colour of surface
c) All of these
d) Surface area
8.
Upon which of the following, radiations emitted by a body depends?
a) Surface area
b) Surface temperature
c) All of these
d) Texture of surface
9.
What is a metal box called that have different natures of faces?
a) Isaac cube
b) F.M cube
c) Leslie’s cube
d) Newton’s cube
10.
How many faces a Leslie’s cube have?
a) Two
b) Three
c) Four
d) Five
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