NEET UG PHYSICS MCQ: GRAVITATION

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Analyzing +4 | -1

Statement-1: A spherical shell produces no gravitational field anywhere.
Statement-2: The field due to various mass elements cancels out, everywhere inside and outside the shell.

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Correct option: D

Statement-1 is false, Statement-2 is false

Option D (Statement-1 is false, Statement-2 is false) is correct because a spherical shell produces zero gravitational field inside, but not outside, and the cancellation of mass elements explains the zero field inside, but not outside.

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If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force

\left( { - K/{r^2}} \right)

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F \propto \frac{1}{r^3}

, but still remaining a central force. Then Two satellites A and B go round a planet P is circular orbits having radii 16 R and 2 R respectively. If the speed of satellite A is

6\,m{s^{ - 1}}

the speed of the satellite B will be [in m/s] nearly The total energy of satellite moving with an orbital velocity

v

around the earth is Two satellites of same mass are launched in the same orbit of radius

r

around the earth so as to rotate opposite to each other. If they collide inelastically and stick together as wreckage, the total energy of the system just after collision is Statement-1: There is almost no effect of rotation of earth at poles.
Statement-2: Because rotation of earth is about polar axis.