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11.In planetary motion a.the angular speed remains constant b.the total angular momentum remains constant c.the linear speed remains constant d.neither the angular momentum nor angular speed remains constant
12.The escape velocity of an object projected from the surface of a given planet is independent of a.the mass of the objective b.the direction of projection c.the mass of planet d.redius of the planet
13.Two air bubbles in water a.attract each other b.repel each other c.neither attract nor repel d.none of the above
14.If the distance between two masses is doubled,gravitational attraction between them a.is doubled b.becomes four times c.is reduced to half d.is reduced to a quarter
15.The period of a satellite in a circular orbit near a planet is independent of a.the mass of the planet b.the radius of the planet c.the mass of the satellite d.all the above
16.If a satellite is orbiting the earth very close to its surface,then the orbital velocity mainly depends on a.the mass of the satellite only b.the radius of earth only d.the mass earth only c.the orbital radius only
17.There is no atmosphere on the moon because a.it is closer to the earth b.it revolves round the earth c.it gets light from the sun d.the escape velocity of gas molecules is lesser than their root mean square velocity here e.none of the above
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