Thermos bottle or Dewer flask consists of a double walled glass vessel with inner and outer walls coated with silver. Give reason.
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A dewar flask or thermos bottle is a device to minimize heat transfer between the contents of the bottle and outside. It consists of a double walled glass vessel with inner and outer walls coated with silver. Radiation from the inner walls is reflected back into the contents of the bottle. The outer wall similarly reflects back any incoming radiation. The space betsween the walls is evacuated to reduce conduction and convection and the flask is supported on an insulator. The device is useful for preventing hot contents like tea from getting cold.
A person pushing a wall hard is liable to fall back. Give reason.
Drops of water are seen on the outer surface of a vessel containing chilled water. Give reason.
Correct sequence of uterine wall outer to inner side?
We cannot move our fingers through a solid wall. Do you agree? Give reason.
Assertion: The greater part of secondary xylem is lighter in colour and consists of dead elements with highly lignified walls and is called heartwood. Reason The peripheral region of the secondary xylem is dark brown in colour and is called sapwood.
Look at the picture of the thermos flask and answer the following question The outer surface of the inner wall of a thermos flask has a very shiny surface. What effect will this have on heat escaping from a hot liquid inside a thermos flask?
Assertion : Endothecium layer of anther wall plays an important role in dehiscence of anther Reason : The presence of fibrous bands and defferential expansion of inner and outer tangential walls of endothecial cells cause dehiscence of anther.
When turgidity increases within the two guard cells flanking each stomatal aperture or pore, the thin outer walls and force the inner walls into a shape.
Which one of the following types of cell is involved in making of the inner walls of large blood vessels ?
Which one of the following types of cell is involved in making of the inner walls of large blood vessels ?
VMC MODULES ENGLISH-PROPERTIES OF MATTER-JEE Advanced (Archive) Level - 2 (MATRIX MATCH TYPE)
