Self Studies

Gravitation Tes...

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  • Question 1
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    The gravitational force with which the earth attracts the moon

  • Question 2
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    The value of gravitational constant in CGS system is 6.67 10–8. Its value in MKS system will be

  • Question 3
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    The tidal waves in the sea are primarily due to

  • Question 4
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    If different planets have the same density, but different radii, then the acceleration due to gravity (g) on the surface of the planet will depend on its radius (R) as

  • Question 5
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    The acceleration due to gravity at Earth is 'g', and the Earth suddenly shrinks uniformly to half its present size without losing any mass. The value of 'g' at the same point (assuming that the distance of the point from the centre of the Earth does not change) will now be

  • Question 6
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    The value of g will be 1% of its value on the surface of Earth at a height of (Re = 6400 km)

  • Question 7
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    The weight of a body at the centre of earth is

  • Question 8
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    If the force of gravity suddenly disappears,

  • Question 9
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    The escape velocity for a planet is ve. A tunnel is dug along a diameter of the planet and a small body is dropped into it at the surface. When the body reaches the centre of the planet, its speed will be

  • Question 10
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    The escape velocity from a planet of mass M and radius R is given by

  • Question 11
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    If 'g' is the acceleration due to gravity at the earth's surface and 'r' is the radius of the earth, the escape velocity for a body to escape out of earth's gravitation field is

  • Question 12
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    The time period of a simple pendulum of infinite length is

  • Question 13
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    The rotation of the earth about its axis speeds up such that a man on the equator becomes weightless. In such a situation, what would be the duration of one day?

  • Question 14
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    Two identical trains A and B move with equal speeds on parallel tracks along the equator. A moves from east to west; and B from west to east. Which train will exert greater force on the tracks?

  • Question 15
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    For a satellite to orbit around Earth, which of the following must be true?

  • Question 16
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    The distances of two satellites from the surface of the earth are R and 7R. Their time periods of rotation are in the ratio

  • Question 17
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    The distances of Neptune and Saturn from the sun are 1013 m and 1012 m, respectively. The ratio of time periods of the planets is

  • Question 18
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    Two planets are moving around the sun. The periodic times of the orbits are T1, T2 and mean radii of the orbits are r1, r2. The ratio of T1/T2 is equal to

  • Question 19
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    Which of the following graphs represents the motion of a planet moving around the sun?

  • Question 20
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    Mass is converted into energy according to the relation

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