Home
Class 11
PHYSICS
By sucking through a straw a student can...

By sucking through a straw a student can reduce the pressure in his lungs to 750 mm of Hg (density `=13.6g//cm^(3))`. Using the straw , he can drink water from a glass upto a maximum depth of ……

A

10 cm

B

75 cm

C

13.6 cm

D

1.36 cm

Text Solution

Verified by Experts

The correct Answer is:
c
Pressure difference between lungs and atmosphere ,
`=760mm-750mm=10mm=1cm` of Hg
Pressure difference `=1xx13.6xxg=hxx1xxgthereforeh=13.6`cm that is one can draw from a depth of 13.6 cm of water.
Promotional Banner

Topper's Solved these Questions

  • MECHANICAL PROPERTIES OF FLUIDS

    KUMAR PRAKASHAN|Exercise SECTION - F (Questions from Module)|21 Videos

  • MECHANICAL PROPERTIES OF FLUIDS

    KUMAR PRAKASHAN|Exercise QUESTION PAPER (SECTION -A)|6 Videos

  • MECHANICAL PROPERTIES OF FLUIDS

    KUMAR PRAKASHAN|Exercise SECTION - (D NCERT Exemplar Solution) (Long Answer Type Questions|3 Videos

  • MACHANICAL PROPERTIES OF SOLIDS

    KUMAR PRAKASHAN|Exercise QUESTION PAPER|11 Videos

  • MOTION IN A STRAIGHT LINE

    KUMAR PRAKASHAN|Exercise QUESTION PAPER|11 Videos

Similar Questions

Explore conceptually related problems

The heart of a man pumps 5 litre of blood through the arteries per minute at a pressure of 150 mm of mercury.If the density of mercury be 13.6 xx10^(3) kg//m^(3)and g = 10 m//s^(2) then the power of heart in watt is :

When an object moves through a fluid, as when a ball falls through air or a glass sphere falls through water te fluid exerts a viscous foce F on the object this force tends to slow the object for a small sphere of radius r moving is given by stoke's law, F_(w)=6pietarv . in this formula eta in the coefficient of viscosity of the fluid which is the proportionality constant that determines how much tangential force is required to move a fluid layer at a constant speed v, when the layer has an area A and is located a perpendicular distance z from and immobile surface. the magnitude of the force is given by F=etaAv//z . For a viscous fluid to move from location 2 to location 1 along 2 must exceed that at location 1, poiseuilles's law given the volumes flow rate Q that results from such a pressure difference P_(2)-P_(1) . The flow rate of expressed by the formula Q=(piR^(4)(P_(2)-P_(1)))/(8etaL) poiseuille's law remains valid as long as the fluid flow is laminar. For a sfficiently high speed however the flow becomes turbulent flow is laminar as long as the reynolds number is less than approximately 2000. This number is given by the formula R_(e)=(2overline(v)rhoR)/(eta) In which overline(v) is the average speed rho is the density eta is the coefficient of viscosity of the fluid and R is the radius of the pipe. Take the density of water to be rho=1000kg//m^(3) Q. What is the viscous force on a glass sphere of radius r=1mm falling through water (eta=1xx10^(-3)Pa-s) when the sphere has speed of 3m/s?

Water is flowing through a horizontal pipe of irregular cross section . If the pressure at a point where the velocity is 0.2ms^(-1) is 30 mm Hg , what will be the pressure at a point where the velocity is 1.2ms^(-1) ? (Density of mercury =13.6gcm^(-3),g=1000cms^(-2) , Density of water =1gcm^(-3))

Water rises to a height of 10 cm in a capillary tube and mercury falls to a depth of 3.42 cm in the same capillary tube. If the density of mercury is 13.6 g//c.c. and the angles of contact for mercury and for water are 135^@ and 0^@ , respectively, the ratio of surface tension for water and mercury is

Determine the change in volume of 6 litres of alcohol if the pressure is decreased from 200 cm of Hg to 75 cm. [velocity of sound in alcohol us 1280 m/s, density of alcohol = 0.81 gm/c c, density of Hg - 13.6 gm//c c and g = 9.81 m//s^(2) ]

A factory manufactures two types of screws, A and B. Each type of screw requires the use of two machines, an automatic and a hand operated. It takes 4 minutes on the automatic and 6 minutes on hand operated machines to manufacture a package of screws A, while it takes 6 minutes on automatic and 3 minutes on the hand operated machines to manufacture a package of screws B. Each machine is available for at the most 4 hours on any day. The manufacturer can sell a package of screws A at a profit of Rs. 7 and screws B at a profit of Rs. 10. Assuming that he can sell all the screws he manufactures, how many packages of each type should the factory owner produce in a day in order to maximise his profit ? Determine the maximum profit.

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 2.5cm for a grown up person. A perosn can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around 25cm. A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image o the spectacle lens becomes object for the eye lens and whose image is formed on the retina. The number of spectacle lens used for th eremedy of eye defect is decided by the power fo the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is +3D (converging lens of focal length 100//3cm ), then number of lens will be +3 . For all the calculations required, you can use the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens. Q. Maximum focal length of a eye lens of a normal person is

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 2.5cm for a grown up person. A perosn can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around 25cm. A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image o the spectacle lens becomes object for the eye lens and whose image is formed on the retina. The number of spectacle lens used for th eremedy of eye defect is decided by the power fo the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is +3D (converging lens of focal length 100//3cm ), then number of lens will be +3 . For all the calculations required, you can use the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens. Q. Maximum focal length of a eye lens of a normal person is

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 2.5cm for a grown up person. A perosn can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around 25cm. A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image o the spectacle lens becomes object for the eye lens and whose image is formed on the retina. The number of spectacle lens used for th eremedy of eye defect is decided by the power fo the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is +3D (converging lens of focal length 100//3cm ), then number of lens will be +3 . For all the calculations required, you can use the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens. Q. Maximum focal length of a eye lens of a normal person is

Find the pressure in a bubble of radius 0.2 cm formed at the depth of 5cm from the free surface of water . The surface tension of water is 70 dyne cm^(-1) and its density is 1gcm^(-3) . Atmospheric pressure is 10^(6) dyne cm^(-2) .The gravitational acceleration is 980cms^(-2) .

KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION - E (MCQS)
  1. Two small drops of mercury each of radius r coalesce to form a single ...

    Text Solution

    |

  2. A sphere of mass M and radius R is falling in a viscous fluid .The te...

    Text Solution

    |

  3. By sucking through a straw a student can reduce the pressure in his lu...

    Text Solution

    |

  4. In old age arteries carrying blood in the human body become narrow res...

    Text Solution

    |

  5. Work of 3.0xx10^(-4) Joule is required to be done in increasing the si...

    Text Solution

    |

  6. When is the work done by a force is positive and negative ?

    Text Solution

    |

  7. Neglecting the density of air ,the terminal velocity obtained by a rai...

    Text Solution

    |

  8. Two spherical soap bubbles of radii a and b in vacuum coalesce under i...

    Text Solution

    |

  9. A liquid is kept in a cylindrical vessel which is being rotated about ...

    Text Solution

    |

  10. A capillary tube of radus r is immersed in water and water rises in it...

    Text Solution

    |

  11. Water is flowing with velocity 4ms^(-1) in a cylinder of diameter 8 cm...

    Text Solution

    |

  12. Assertion : Surface tension decreases with increase in temperature . ...

    Text Solution

    |

  13. Water is flowing in a non viscous tube as shown in the diagram .The di...

    Text Solution

    |

  14. Two spherical soap bubbles of radii a and b in vacuum coalesce under i...

    Text Solution

    |

  15. A small bulb is placed at the bottom of a tank containing water to a d...

    Text Solution

    |

  16. The wettability of a surface by a liquid depends primarily on ……..

    Text Solution

    |

  17. A wind with speed 40m//s blows parallel to the roof of a house .The ar...

    Text Solution

    |

  18. The cylindrical tube of a spray pump has radius R, one end of which ha...

    Text Solution

    |

  19. Water rises to height h' in capillary tube .If the length of capillary...

    Text Solution

    |

  20. Two non -mixing liquids of densities rho and np (ngt1) are put in cont...

    Text Solution

    |