Gravitation Tes...

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Assertion: Smaller the orbit of the planet around the sun, shorter is the time it takes to complete one revolution.

Reason: According to Kepler’s third law of planetary motion, square of time period is proportional to cube of mean distance from sun.

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Assertion: Gravitational force between two particles is negligibly small compared to the electrical force.

Reason: The electrical force is experienced by charged particles only.

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Assertion: The universal gravitational constant is same as acceleration due to gravity. Reason: Gravitational constant and acceleration due to gravity have same dimensional formula.

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Assertion: If a pendulum is suspended in a lift and lift is falling freely, then its time period becomes infinite.

Reason: Free falling body has acceleration equal to acceleration due to gravity.

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Assertion: If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become the same at all the places.

Reason: The value of acceleration due to gravity is independent of rotation of earth.

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Assertion: There is no effect of rotation of earth on acceleration due to gravity at poles.

Reason: Rotation of earth is about the polar axis.

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Assertion: A force act upon the earth revolving in a circular orbit about the sun. Hence work should be done on the earth.

Reason: The necessary centripetal force for circular motion of earth comes from the gravitational force between earth and sun.

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Assertion: The ratio of inertial mass to gravitational mass is equal to one.

Reason: The inertial mass and gravitational mass of a body are equivalent.

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Assertion: Gravitational potential of earth at every place on it is negative.

Reason: Everybody on earth is bound by the attraction of earth.

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Assertion: A planet moves faster, when it is closer to the sun in its orbit and vice versa.

Reason: Orbital velocity in orbital of planet is constant.

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Assertion: If an earth satellite moves to a lower orbit, there is some dissipation of energy but the satellite speed increases.

Reason: The speed of satellite is a constant quantity.

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Assertion: Earth has an atmosphere but the moon does not.

Reason: Moon is very small in comparison to earth.

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Assertion: Two different planets have same escape velocity.

Reason: Value of escape velocity is a universal constant.

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Assertion: Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to a very large height.

Reason: The path of a projectile is independent of the gravitational force of earth.

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Assertion: Space rockets are usually launched in the equatorial line from west to east.

Reason: The acceleration due to gravity is minimum at the equator.