
radiation

Quiz
•
Physics
•
7th Grade
•
Hard

思奇 吴
Used 1+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The radiators on motor cars are painted black because ________.
black surface is more beautiful
a black surface can conduct heat better
a black surface is a good radiator of infra-red rays
it will not get dirtt easily
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
By which process is thermal energy transferred through a vacuum?
conduction only
convection only
conduction and convection only
radiation only
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which type of surface is the best absorber of infra-red rays?
black and rough
black and smooth
white and rough
white and smooth
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
We feel the intense heat from the Sun when we stand in the open during noon time. How is heat transferred from the Sun to the Earth?
By radiation only.
By conduction and radiation only.
By convection and radiation only.
By conduction, convection and radiation.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A teapot is needed to keep tea hot for a long period of time. Which of the following best explains why teapots are usually made of a shiny metal?
Shiny surfaces are good absorbers of infra-red radiation.
Shiny surfaces are good emitters of infra-red radiation.
Shiny surfaces are poor absorbers of infra-red radiation.
Shiny surfaces are poor emitters of infra-red radiation.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Four different closed vessels contain equal amounts of ice.
Which vessel would take the shortest time for all the ice to melt?
A
B
C
D
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The diagram shows a vacuum flask.
The main reason for the vacuum is to reduce heat transfer by
conduction and convection.
conduction only.
radiation only.
convection only.
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