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black surface is a good conductor of heat.
black surface is a poor conductor of heat.
black surface is a good absorber of heat.
it is difficult to clean daily
Outside of cooking utensils are generally left black from below because
Ozone at the higher level of the atmosphere is a product of _ acting on oxygen molecules.
Ozone protects biosphere from
Parabolic mirors are used in
Parallax of one arc second‖ is a unit of which of the following?
Pasteurisation of milk means-
Permissible noise level at Residential area during night time is :
Persistance of vision is the principle behind
Persistence of vision is the Principle behind:
Persons suffering from myopia are advised to use