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Gravitation Test - 47

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Gravitation Test - 47
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  • Question 1
    1 / -0
    Name the force which is applied by water on the ship in an ocean.
    Solution

  • Question 2
    1 / -0
    Weight of a body is.
    Solution
    Weight of a body depends upon mass of the body and acceleration due to gravity. The gravitational acceleration is not constant and changes depending on the mass of the larger body. Thus weight is not constant, unlike mass.
  • Question 3
    1 / -0
    Which of the following doesn't show that air has pressure?
    Solution
    A kite flies with the help of air exerting its pressure along it. riding a bicycle against the wind, means, the air exerts pressure opposite to the direction of bicycle. But a ball falling to the ground is solely responsible for the gravitational force acting between the ball and earth and has nothing to do with air pressure.
    Thus a ball falling to the ground doesn't show that air has pressure
  • Question 4
    1 / -0
    The unit of mass in SI system is ______ and the unit of weight in SI system is _______.
    Solution
    SI unit of mass is $$kg$$
    Also, weight is nothing but the force exerted by the earth on a body, so its SI unit will be same as that of force. 
    Therefore, SI unit of weight is $$Newton$$ 

    Hence correct answer is option $$A $$ 
  • Question 5
    1 / -0
    If the weight of an object on the earth is 12 N,find the weight of this object on the moon.
  • Question 6
    1 / -0
    Find the weight of an object if its mass is $$50\ kg$$. (Take $$g=10\ m/s^2$$)
    Solution
    Given:
    Mass of the object $$m=50\ kg$$
    Gravitational acceleration $$g=10\ m/s^2$$

    We know that, $$Weight=Mass\times g$$
    $$\therefore Weight=50\times 10 = 500\ N$$
  • Question 7
    1 / -0
    The unit of $$\dfrac {G}{g}$$ is:
    Solution
    $$F=\dfrac{G m_{1}m_{2}}{r^{2}}$$
    $$mg=\dfrac{G m_{1} m_{2}}{r^{2}}$$
    $$\dfrac{G}{g}=\dfrac{r^{2}m}{m_{1}m_{2}}$$

    Unit is
    $$\dfrac{G}{g}=\dfrac{m^{2}}{kg}$$
  • Question 8
    1 / -0
    Which of the following forces can be applied on to the mug when you try to dip it into a bucket full of water?
    Solution

  • Question 9
    1 / -0
    The SI unit of weight is the same as that of:
    Solution
    Weight is the force of attraction of the earth acting on an object. Thus its SI unit is the same as that of the force. The SI unit of both weight and force is Newton (N).
  • Question 10
    1 / -0
    Archimedes' major contribution / discovery was:
    Solution
    Answer is B
    Archimedes' principle indicates that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces. Because of this buoyancy a body is able to float or submerge over liquid surface.
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