Physics
A radioactive substance does not undergo any change (in mass or charge) during

Beta-emission
Gamma-emission
Oxidation
Alpha-emission

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Physics
The nature of fuse wire is

Low resistance and high melting point.
High resistance and low melting point.
High resistance and high melting point.
Low resistance and low melting point.

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Physics
Rainbow is due to

refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets
ionisation of water deposits

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