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    9.

    Assertion: Gravitational force between two masses in air is F.F. If they are immersed in water, force will remain F.F. Reason: Gravitational force does not depend on the medium between the masses.

    A

    If both Assertion and Reason are correct and Reason is the correct explanation of Assertion

    B

    If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion

    C

    If Assertion is correct but Reason is correct

    D

    If Assertion is incorrect but Reason is correct

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    10.

    Consider a binary star system of star AA and star BB with masses mA{m_A} and mB{m_B} revolving in a circular orbit of radii rA{r_A} and rB{r_B} respectively. If TA{T_A} and TB{T_B} are the time period of star AA and star BB respectively, then

    A

    TATB=(rArB)3/2\frac{{{T_A}}}{{{T_B}}} = {\left( {\frac{{{r_A}}}{{{r_B}}}} \right)^{3/2}}

    B

    TA=TB{T_A} = {T_B}

    C

    TA>TBโ€‰(ifโ€‰โ€‰mA>mB){T_A} > {T_B}\,({\rm{if}}\,\,{m_A} > {m_B})

    D

    TA>TBโ€‰(ifโ€‰โ€‰rA>rB){T_A} > {T_B}\,({\rm{if}}\,\,{r_A} > {r_B})

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