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    Physics
    Fluid-Mechanics
    Easy

    Question

    It is easy to wash clothes in hot water because its

    1. Surface tension is more
    2. Surface tension is less
    3. Consumes less soap
    4. None of these

    The correct answer is: Surface tension is less

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    It is easy to wash clothes in hot water because its

    It is easy to wash clothes in hot water because its

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    A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of 2 ×10-2N to keep the wire in equilibrium. The surface tension, in Nm-1, of water is

    A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of 2 ×10-2N to keep the wire in equilibrium. The surface tension, in Nm-1, of water is

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    With regard to dependence of quantities given in column I and II, match the following :

    Column - I

    Column - II
    i.
    		 Young's modules of a substance
    		 a.
    		 Depends on temperature
    ii.
    		 Bulk modulus of substance
    		 b.
    		 Depends on length
    iii.
    		 Modulus of rigidity of a substance
    		 c.
    		 Depends on area of across section
    iv.
    		 Volume of a substance
    		 d.
    		 Depends on the nature of material

    With regard to dependence of quantities given in column I and II, match the following :

    Column - I

    Column - II
    i.
    		 Young's modules of a substance
    		 a.
    		 Depends on temperature
    ii.
    		 Bulk modulus of substance
    		 b.
    		 Depends on length
    iii.
    		 Modulus of rigidity of a substance
    		 c.
    		 Depends on area of across section
    iv.
    		 Volume of a substance
    		 d.
    		 Depends on the nature of material

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    Match the following

    Column - I

    Column - II
    i.
    		 Splitting of bigger drop into small droplets
    		 a.
    		 Temperature increases
    ii.
    		 Formation of bigger drop from small droplets
    		 b.
    		 Temperature in creases
    iii.
    		 Spraying of liquid
    		 c.
    		 Surface energy increases
    iv.
    		  
    		 d.
    		 Surface energy decrease

    Match the following

    Column - I

    Column - II
    i.
    		 Splitting of bigger drop into small droplets
    		 a.
    		 Temperature increases
    ii.
    		 Formation of bigger drop from small droplets
    		 b.
    		 Temperature in creases
    iii.
    		 Spraying of liquid
    		 c.
    		 Surface energy increases
    iv.
    		  
    		 d.
    		 Surface energy decrease

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    Match the following

    Column - I

    Column - II
    longitudinal stress
    		 a.
    		 Volume changes
    Shear stress
    		 b.
    		 Shape changes
    Volume changes
    		 c.
    		 Volume does not change
    Tensile stress                   
    		 d.
    		 Shape does not change

    Match the following

    Column - I

    Column - II
    longitudinal stress
    		 a.
    		 Volume changes
    Shear stress
    		 b.
    		 Shape changes
    Volume changes
    		 c.
    		 Volume does not change
    Tensile stress                   
    		 d.
    		 Shape does not change

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    n Column L a uniform bar of uniform cross-sectional area under the application of forces is shown  in the figure and in Column II, some effects/phenomena are given. Match the entries of Column I with the entries of Column II.

    Column - I

    Column - II
    i.
    		   a.
    		 Uniform stresses developed in the rod
    ii.
    		   b.
    		 Non- uniform stresses developed in the rod
    iii.
    		   c.
    		 Compressive stress developed
    iv.
    		   d.
    		 Tensile stresses developed

    n Column L a uniform bar of uniform cross-sectional area under the application of forces is shown  in the figure and in Column II, some effects/phenomena are given. Match the entries of Column I with the entries of Column II.

    Column - I

    Column - II
    i.
    		   a.
    		 Uniform stresses developed in the rod
    ii.
    		   b.
    		 Non- uniform stresses developed in the rod
    iii.
    		   c.
    		 Compressive stress developed
    iv.
    		   d.
    		 Tensile stresses developed

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    Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface    have unequal force leading to a tension on the surface. If this is not compensated by a farce, the        equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The   nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of   the liquid decided by the forces between the molecules, air-and container can make the angle of  contact.
    If the excess pressure in a soap bubble is p, the excess pressure in an air bubble is

    Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface    have unequal force leading to a tension on the surface. If this is not compensated by a farce, the        equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The   nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of   the liquid decided by the forces between the molecules, air-and container can make the angle of  contact.
    If the excess pressure in a soap bubble is p, the excess pressure in an air bubble is

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    Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface    have unequal force leading to a tension on the surface. If this is not compensated by a farce, the        equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The   nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of  the liquid decided by the forces between the molecules, air-and container can make the angle of  contact.
    The direction of the excess pressure in the meniscus of a liquid of angle of contact 2 pi divided by 3 is

    Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface    have unequal force leading to a tension on the surface. If this is not compensated by a farce, the        equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The   nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of  the liquid decided by the forces between the molecules, air-and container can make the angle of  contact.
    The direction of the excess pressure in the meniscus of a liquid of angle of contact 2 pi divided by 3 is

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    A steel bolt of cross-sectional area A subscript b equals 5 cross times 10 to the power of negative 5 end exponent straight m squared is passed through a cylindrical tube made of aluminium. Cross-sectional area of the tube material is A subscript t equals 10 to the power of negative 4 end exponent m squared and its length is l =50 cm. The bolt is just taut to that there is no stress in the bolt and temperature of the assembly increases through straight capital delta theta equals 10 to the power of ring operator straight C. Given, coefficient of linear thermal expansion of steel, alpha subscript b equals 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    .
    Young 's modulus of steel Y subscript b equals 2 cross times 10 to the power of ′′ N divided by m squared
    Young's modulus of A l comma Y subscript t equals 10 to the power of 11 N divided by m squared ,coefficient of
    linear thermal expansion of A l alpha subscript t equals 2 cross times 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    The compressive stress in tube is

    A steel bolt of cross-sectional area A subscript b equals 5 cross times 10 to the power of negative 5 end exponent straight m squared is passed through a cylindrical tube made of aluminium. Cross-sectional area of the tube material is A subscript t equals 10 to the power of negative 4 end exponent m squared and its length is l =50 cm. The bolt is just taut to that there is no stress in the bolt and temperature of the assembly increases through straight capital delta theta equals 10 to the power of ring operator straight C. Given, coefficient of linear thermal expansion of steel, alpha subscript b equals 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    .
    Young 's modulus of steel Y subscript b equals 2 cross times 10 to the power of ′′ N divided by m squared
    Young's modulus of A l comma Y subscript t equals 10 to the power of 11 N divided by m squared ,coefficient of
    linear thermal expansion of A l alpha subscript t equals 2 cross times 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    The compressive stress in tube is

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    A steel bolt of cross-sectional area A subscript b equals 5 cross times 10 to the power of negative 5 end exponent straight m squared is passed through a cylindrical tube made of aluminium. Cross-sectional area of the tube material is A subscript t equals 10 to the power of negative 4 end exponent m squared and its length is l =50 cm. The bolt is just taut to that there is no stress in the bolt and temperature of the assembly increases through straight capital delta theta equals 10 to the power of ring operator straight C. Given, coefficient of linear thermal expansion of steel, alpha subscript b equals 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    .
    Young 's modulus of steel Y subscript b equals 2 cross times 10 to the power of ′′ N divided by m squared
    Young's modulus of A l comma Y subscript t equals 10 to the power of 11 N divided by m squared ,coefficient of
    linear thermal expansion of A l alpha subscript t equals 2 cross times 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    the compressive strain in tube is

    A steel bolt of cross-sectional area A subscript b equals 5 cross times 10 to the power of negative 5 end exponent straight m squared is passed through a cylindrical tube made of aluminium. Cross-sectional area of the tube material is A subscript t equals 10 to the power of negative 4 end exponent m squared and its length is l =50 cm. The bolt is just taut to that there is no stress in the bolt and temperature of the assembly increases through straight capital delta theta equals 10 to the power of ring operator straight C. Given, coefficient of linear thermal expansion of steel, alpha subscript b equals 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    .
    Young 's modulus of steel Y subscript b equals 2 cross times 10 to the power of ′′ N divided by m squared
    Young's modulus of A l comma Y subscript t equals 10 to the power of 11 N divided by m squared ,coefficient of
    linear thermal expansion of A l alpha subscript t equals 2 cross times 10 to the power of negative 5 end exponent divided by to the power of ring operator straight C
    the compressive strain in tube is

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    A long capillary tube of radius 0.2 min is placed vertically inside a beaker of water
    If the tube is now pushed into water so that only 5.0 cm of its length is above the surface, then determine the angle of contact between the liquid and glass surface.

    A long capillary tube of radius 0.2 min is placed vertically inside a beaker of water
    If the tube is now pushed into water so that only 5.0 cm of its length is above the surface, then determine the angle of contact between the liquid and glass surface.

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    A long capillary tube of radius 0.2 min is placed vertically inside a beaker of water
    If the surface tension of water is  7.2 cross times 10 to the power of negative 2 end exponent N divided by m and the angle of contact between
    glass and water is zero, then determine the height of the water column in the tube.

    A long capillary tube of radius 0.2 min is placed vertically inside a beaker of water
    If the surface tension of water is  7.2 cross times 10 to the power of negative 2 end exponent N divided by m and the angle of contact between
    glass and water is zero, then determine the height of the water column in the tube.

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    A light rod of length L = 2 m is suspended horizontally from the ceiling by two wires A and B of equal lengths. The wire A is made of steel with the area of cross section AsA subscript S equals 1 cross times 10 to the power of negative 5 end exponent straight m squared , while the wire B is made of brass of cross-sectional area .A subscript b equals 2 cross times 10 to the power of negative 5 end exponent straight m squared A weight W is suspended at a distance x from the wire A as shown in the figure. Take, Young's modulus of steel and brass as
    Y subscript s equals 2 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent text end text and Y subscript b equals 1 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent

    Determine the value of x so that equal strains are produced in each wire.

    A light rod of length L = 2 m is suspended horizontally from the ceiling by two wires A and B of equal lengths. The wire A is made of steel with the area of cross section AsA subscript S equals 1 cross times 10 to the power of negative 5 end exponent straight m squared , while the wire B is made of brass of cross-sectional area .A subscript b equals 2 cross times 10 to the power of negative 5 end exponent straight m squared A weight W is suspended at a distance x from the wire A as shown in the figure. Take, Young's modulus of steel and brass as
    Y subscript s equals 2 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent text end text and Y subscript b equals 1 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent

    Determine the value of x so that equal strains are produced in each wire.

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    A light rod of length L = 2 m is suspended horizontally from the ceiling by two wires A and B of equal lengths. The wire A is made of steel with the area of cross section AsA subscript S equals 1 cross times 10 to the power of negative 5 end exponent straight m squared , while the wire B is made of brass of cross-sectional area .A subscript b equals 2 cross times 10 to the power of negative 5 end exponent straight m squared A weight W is suspended at a distance x from the wire A as shown in the figure. Take, Young's modulus of steel and brass as
    Y subscript s equals 2 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent text end text and Y subscript b equals 1 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent

    Determine the value of x so that equal stresses are produced in each wire.

    A light rod of length L = 2 m is suspended horizontally from the ceiling by two wires A and B of equal lengths. The wire A is made of steel with the area of cross section AsA subscript S equals 1 cross times 10 to the power of negative 5 end exponent straight m squared , while the wire B is made of brass of cross-sectional area .A subscript b equals 2 cross times 10 to the power of negative 5 end exponent straight m squared A weight W is suspended at a distance x from the wire A as shown in the figure. Take, Young's modulus of steel and brass as
    Y subscript s equals 2 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent text end text and Y subscript b equals 1 cross times 10 to the power of 11 Nm to the power of negative 2 end exponent

    Determine the value of x so that equal stresses are produced in each wire.

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    A vertical glass capillary tube, open at both ends, contains some water. Which of the following   shapes may not be taken by the water in the tube?

    A vertical glass capillary tube, open at both ends, contains some water. Which of the following   shapes may not be taken by the water in the tube?

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