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The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon is not the same as the origin of rainbow colours (caused by the refraction of internally reflected light), but rather are the same as the phenomenon causing the colours in an oil slick on a wet road.
The product of the equivalent weight and valency of an element equals its ______.
Anemometer is used to measure –
The common name of hydrogen peroxide is:
Heat stored in water vapour is –
What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
The process of converting a solid directly into its vapor is called:
Water from soil enters into the root hairs owing to :
Which of the following is the hardest mineral?
Statement I: Glass is not considered as a true compound. Statement II: Glass does not have a definite melting point.
Codes:
Which gas is evolved during the reaction of an acid with a metal?
