Physics
Which conservation principle is applicable in the case of the motion of a rocket?

Conservation of energy
Conservation of momentum
Conservation of charge
Conservation of mass

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

Their velocity increases and they fall with different velocity on the earth
They fall with same ultimate velocity
They fall with that ultimate velocity, which are different for different droplets
Their velocity increases and they fall with same velocity on the earth

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
the intensity of light emitted by them changes with time.
None of these
the refractive index of the different layers of the earth's atmosphere ch

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