Physics
According to the theory of relativity, which of the following always remains constant ?

Velocity of light
Length of an object
Time
Space

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Physics
Isotopes of an element contain

equal number of protons and electrons
equal number of nucleons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons

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Physics
A Fuse wire is characterised by

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

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