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JEE Main Test 52

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JEE Main Test 52
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  • Question 1
    4 / -1

    The equation of a tangent to the parabola y2 = 8x is y = x + 2. The point on this line from which the other tangent to the parabola is perpendicular to the given tangent is

    Solution

    Two tangents of a parabola from a point are perpendicular when the point lies on the directrix of parabola.

    Let P be the required point. Then, P lies on directrix x = -2 of y2 = 8x.

    Point P is on line y = x + 2.

    Then, y = -2 + 2 = 0

    Hence, the coordinates of point P are (-2, 0).

     

  • Question 2
    4 / -1

    If suddenly, the gravitational force of attraction between Earth and a satellite revolving around it becomes zero, then the satellite will

    Solution

    The centripetal and centrifugal forces disappear, the satellite has the tangential velocity and it will move in a straight line.

     

  • Question 3
    4 / -1

    When beryllium is bombarded with -particles, extremely penetrating radiations which ∝-cannot be deflected by electrical or magnetic field are given out. These are

    Solution

    Neutron is a chargeless particle, so it does not get deflected by electric or magnetic field.

     

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