Physics
Isotopes of an element contain

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

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Physics
Railway tracks are banked on curves

necessary centripetal force may be obtained from the horizontal component of the weight of the train
necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels
the train may not fly off in the opposite direction

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

A will reach the ground first.
The question is incomplete because the masses of the spheres are not given.
Both the spheres will reach the ground simultaneously.
B will reach the ground first.

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