Swarnavo
from
Reso, Kota
Subject :NSO Class : Class 7
A thermo flask is a household item that is used to keep things warm or cold for a long time. What is the use of silvered wall in thermo flask?
A To reduce the flow of heat by conduction.
B To increase the temperature by convection.
C To reflect the heat back to reduce radiation.
D To prevent the glass vessel from breaking.
Ans 1:
Edit Post
Ans 2:
Edit Post
Hritvi
from
Podar International School, Mumbai
Class : Class 7
Option C is the correct answer as the silvered walls of the thermo flask helps the liquid to sustain its form by reflecting the heat by Radiation (Heat that does not need any medium to travel unlike conduction and convection.)
Ans 3:
Edit Post
Bhumi Chheda
from
SVKM J V Parekh International School, Mumbai
Class : Class 9
i am not sure if it is A or C
Ans 7:
Edit Post
Ans 8:
Edit Post
Anagha s Karnis
from
vijaya vittala vidyashala, MYSORE
Class : Class 8
Option c is the correct answer, because if at all any cold material is stored in the flask, then the liquid becomes hot due to the heat of the sun. Hence it is used to reflect the radiation from the sun
Ans 9:
Edit Post
shashwat pandey
from
Doon International School Dalanwala, Dehradun
Class : Class 8
In my opinoin A is corrcect beacuse silvered wall is a solid thing and solid thing get's heat through the process of conduction.