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Gravitation Test - 61

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Gravitation Test - 61
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  • Question 1
    1 / -0
    Relative density of a substance is expressed by comparing the density of that substance with the density of:
    Solution
    The density of water at 4C4^\circ C is 1 gcm31\ g cm^{-3}, which is considered as the standard.
    relative density=density of the substancedensity of the water\text{relative density} = \dfrac{ \text{density of the substance} }{ \text{density of the water} }
  • Question 2
    1 / -0
    The value of G is
    Solution
    Universal gravitational constant is represented as 'G'. Its value is G=6.7×1011 Nm2kg2G = 6.7 \times 10^{-11} \ Nm^{2}kg^{-2}
  • Question 3
    1 / -0
    Newton's law of gravitation is called the universal law of gravitation because:
    Solution
    Newtons law of gravitation is called the universal law of gravitation because it is applicable for all masses at all distances, independent of the medium. 

    For two masses m1m_1 and m2m_2 placed at a distance dd,  the gravitational force between them will always be given by: 
    Fg=Gm1m2d2F_g=G\dfrac{m_1m_2}{d^2}
    That's why it is a "universal" law.
  • Question 4
    1 / -0
    Universal gravitational constant, G depends:
    Solution
    Universal gravitational constant, GG is independent of the nature of the particle, medium between the particles, and time. Its value is constant anywhere in the Universe, and hence it's called 'Universal'. 
  • Question 5
    1 / -0
    If the weight of a man on earth’s surface is 60 N60\ N, then what will be the weight on the surface of the moon?
    Solution
    Given,
    Weight of a man on earth’s surface =60 N= 60\ N

    We know,
    Weight of the object on the moon=16×weight of the object on the earth\text{Weight of the object on the moon}=\dfrac 16 \times \text{weight of the object on the earth}

    Weight of the object on the moon=16×60\text{Weight of the object on the moon}=\dfrac 16 \times 60

    Weight of the object on the moon=10 N\text{Weight of the object on the moon}=10\ N
  • Question 6
    1 / -0
    Construction of submarines is based on
    Solution
    It is based on Archimedes principle , according to it is physical law of buoyancy, discovered by the ancient Greek mathematician and inventor Archimedes, stating that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force, the magnitude of which is equal to the weight of the fluid 
  • Question 7
    1 / -0
    The mass of an object ................
    Solution
    Mass is a quantity of matter that is constant throughout the universe. it is a scalar quantity and it can not measure with the same spring balance at all possible locations. Because spring balance gives reading m=weight of objectgm=\dfrac{weight\ of\ object}{g}. hence, with changing location, weight of an object will change but gg will be fixed for that particular instrument. therefore, Reading will not show accurate. 

    Option B
  • Question 8
    1 / -0
    The law of gravitation is true for:
    Solution
    The law of gravitation is true for any two masses of body. 
    The Law applies to all objects with masses, big or small. Two big objects can be considered as point-like masses, if the distance between them is very large compared to their sizes or if they are spherically symmetric
  • Question 9
    1 / -0
    Practically the value of G for the first time was measured by ...........
    Solution
    The Cavendish has performed an experiment to calculate the gravitation force between two masses. and he gave the value of gravitational constant GG, which is equal to 6.75×1011  Nm2kg26.75\times 10^{-11}\ \ Nm^2kg^{-2}
  • Question 10
    1 / -0
    The direction of weight of an object is in .............. direction.
    Solution
    Weight is nothing but the pull due to gravity, so it always is in the direction of gravitational force.
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