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Electrons
Neutrons
Electromagnetic radiations
Alpha particles
Out of the following, which is not emitted by radioactive substance?
Outside of cooking utensils are generally left black from below as
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