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Force and Pressure Test - 38

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Force and Pressure Test - 38
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  • Question 1
    1 / -0
    State whether the following statements are true or false?
    (i) the pressure inside our body is equal to the atmospheric pressure
    (ii) pressure is inversely proportional to the area.
    Solution
    (i) True, because we do not get crushed by the atmosphere as the pressure inside our body and atmospheric pressure are equal.
    (ii) True, as pressure=forceareapressure=\dfrac{force}{area}. So, for constant force, pressure1areapressure\propto\dfrac{1}{area}
  • Question 2
    1 / -0
    What happens when pressure inside a sealed can is less than the atmospheric pressure?
    Solution
    When the pressure inside a sealed can become less than the atmospheric pressure, the atmospheric pressure pushes the surface of the can inside and the can is crushed.
  • Question 3
    1 / -0
    Two vessels, one cylindrical and another cubical are filled by water to the same height. Near the base, lateral pressure exerted by the liquid on the wall
    Solution
    Liquid pressure depends on the depth of the liquid. It does not depend on the shape of the container. So, the lateral pressure at a given depth will be the same in both the vessels.
  • Question 4
    1 / -0
    Mark the correct statements
    Solution
    Force exists only as a result of an interaction of two objects.A force can not exist without the interaction of two bodies. 


    The newton first law states that an object at rest will stay at rest, and an object in motion will stay in motion unless acted on by a net external force.
    Hence Newtons first law of motion introduces about external forces.


    Based on whether physical contact is present or not , forces are categorised into two types.
    (1) contact forces and
    (2) non-contact-forces

    Contact forces are forces in which the two interacting objects are physically in contact with each other. Examples of contact forces are:
    Buoyant force
    Friction force

    A non-contact force is a force which acts on an object without coming physically in contact with it.The most familiar non-contact force is weight acting on a body due to gravity.
  • Question 5
    1 / -0
    The tremendous pressure exerted by air can be demonstrated by :
    Solution
    Crushing can experiment: 
    Take an empty and absolutely clean oil can and put in it about 0.250.25 litres of water. Heat the can in fire till all the air is expelled out and the steam comes out freely from its mouth. Screw the mouth of the can with a lid and immediately remove it away from the fire. Pour cold water on the can. It is found that the can gets crushed. The reason is that on pouring cold water, the steam changes into water, thereby causing a vacuum inside the can. Thus the tremendous atmospheric pressure exerts pressure from outside and crushes the can.

  • Question 6
    1 / -0
    Pressure which a fluid exerts on the sides of a container , below its free surface is known as
    Solution
    Definition of lateral pressure, whereas the pressure at the base of vessel is simply called pressure.
  • Question 7
    1 / -0
    In crushing can experiment, the vaccum inside the can causes .......in pressure.
    Solution
    Crushing can experiment ,Take an empty and absolutely clean Mobil oil can and put in it about 0.25 liters of water. Heat the can in fire till all the air is expelled out and the steam comes out freely from its mouth.screw the mouth of the can with a lid and immediately remove it away from the fire .pour cold water on the can. It is found that the can gets crushed.the reason is that on pouring cold water, the steam changes into water ,thereby,causing a vaccum inside the can. Thus the tremendous atmospheric pressure,exerts pressure from outside and crushes the can.
  • Question 8
    1 / -0
    A force can change:
    Solution

  • Question 9
    1 / -0
    Which of the following are the common consequences of atmospheric pressure in our daily life.
    Solution
    Liquid flows from higher pressure region to the lower pressure region.
    Thus sucking a drink with a straw, filling a syringe with a liquid and filling ink in a fountain pen are the consequences of atmospheric pressure.
  • Question 10
    1 / -0
    In crushing can experiment the can gets crushed because of:
    Solution
    Crushing can experiment: Take an empty and absolutely clean can and put in it about 0.25 l0.25 \ l of water. Heat the can in the fire till all the air is expelled out and the steam comes out freely from its mouth. Screw the mouth of the can with a lid and immediately remove it away from the fire. Pour cold water on the can. It is found that the can gets crushed.

    The reason is that, on pouring cold water, the steam changes into water thereby, creating a partial vacuum inside the can, and hence the pressure exerted on the inner walls of the can decreases. Thus, the air pressure, exerted from outside is greater and that crushes the can.

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