Self Studies
Self Studies
Self Studies
Self Studies

Force and Pressure Test - 39

Result Self Studies

Force and Pressure Test - 39
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    When we press the bulb of dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to:
    Solution
    The rise of water in the dropper is due to atmospheric pressure.
    When the bulb of a dropper is pressed, the pressure inside the dropper decreases and this causes the water to go inside the dropper.
  • Question 2
    1 / -0
    On a body, a force of $$5N$$ is applied towards North and another force of $$2N$$ is applied towards South. Net force on the body is
    Solution
    When forces are applied inn the opposite directions, the forces get subtracted.
    So, net force on the body$$=(5-2)N=3N$$
  • Question 3
    1 / -0
    At what position the fluid experiences more pressure
    Solution
    The pressure at a point in the fluid is due to the weight of the fluid above that point, acting on unit area.
    Since the weight above the bottommost point is the highest, the pressure is maximum at that point.
  • Question 4
    1 / -0
    In terms of physics, which of the following are considered as fluids?
    Solution
    A fluid is defined as a substance that has no fixed shape and yields easily to external pressure. They are free to flow, and hence the name fluid. They are of two kinds- Gases and Liquids.

    Solids are not classified as fluids as they have a definite shape and volume.

  • Question 5
    1 / -0
    The fluid itself exerts pressure whose force component is equal to its ___________. Complete the sentence.
    Solution
    The pressure due to a fluid, for example, the pressure due to water, is due to the weight of the fluid above that point on the point.
    $$\text{Force = Pressure} \times \text{Area}$$ 
    Hence the force component for the pressure is the weight of the fluid.
    the fluid on the bottom has much greater pressure than the fluid on the top, due to the weight of the fluid above it.
  • Question 6
    1 / -0
    Fluid pressure comprises of which of the following pressures?
    Solution
    A fluid is defined as a substance that has no fixed shape and yields easily to external pressure. They are of two kinds- Gases and Liquids.
    The fluid pressure is, thus, of two kinds.
    One is due to gases(air) and is called air pressure.
    The other is due to liquids(water) and is called water pressure.
  • Question 7
    1 / -0
    A block of mass of a $$2kg$$ with dimensions $$5cm\times 20cm\times 10cm$$ respectively. The ratio of minimum to maximum pressure it exerts on the change in orientation is:
    Solution
    Pressure is the force per unit area. So, $$P=F/A$$
    Thus, minimum surface area $$(5 cm \times 10 cm) $$ will give the maximum pressure and maximum area $$(20 cm\times 10 cm)$$  will give the minimum pressure. 
    So, $$P_{max}=\dfrac{2g}{50\times 10^{-4}} N/m^2$$ and $$P_{min}=\dfrac{2g}{200\times 10^{-4}} N/m^2$$
    Thus, $$\dfrac{P_{min}}{P_{max}}=50/200=1/4$$
    The option C will be right. 
  • Question 8
    1 / -0
    Why does a sharp knife enable us to cut through things more easily?
    Solution
    The pressure is defined as the force per unit area. i.e $$P=F/A$$
    So the pressure depends on the force F and area A of contact.
    If force is constant, the pressure is only depends on the area. 
    A sharp knife edge has small area of contact and less area of contact will produce the more pressure. 
    Thus, the option B can be correct.  
  • Question 9
    1 / -0
    Liquid pressure at a point in a liquid does not depend on the
    Solution
    The expression of the pressure at a point in a fluid is given by $$P=h\rho g$$
    where. 
    $$h$$; depth of the point from the surface, 
    $$\rho$$; be the density of the fluid and 
    $$g$$; acceleration due to gravity
    Thus, the pressure in liquid at a point does not depend on the shape of the vessel in which the liquid is kept.
  • Question 10
    1 / -0
    Compare the pressure exerted by a sharp needle on a surface and the pressure exerted by a blunt needle.
    Solution
    Pressure is defined as $$P=\dfrac{Force \ applied}{Area}$$

    So the pressure applied is inversely proportional to the area to which it is applied.

    Since in a sharp needle, surface area on which the force is applied, is less than that for a blunt needle.

    Hence, pressure exerted by a sharp needle is more than blunt needle. 

Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now