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Medical
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Steam at 100o C is passed into 20 g of water at 10o C. When water acquires a temperature of 80o C, the mass of water present will be:

[Take specific heat of water = 1 cal g-1 oC -1 and latent heat of steam = 540 cal g-1]

  • Option 1)

    24 g

  • Option 2)

    31.5 g

  • Option 3)

    42.5 g

  • Option 4)

    22.5 g

 
As discussed in Specific Heat - Amount of heat(Q) required to raise the temperature of unit mass through 1oC. - wherein   Specific heat of water  Latent heat of steam  Heat gained by 20g of water to change its temperature from  to  According to principle of calorimetry   or  total mass of water =  Option 1) 24 g This solution is incorrect Option 2) 31.5 g This solution is incorrect Option...
Medical
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Copper of fixed volume 'V' is drawn into wire of length 'l'. When this wire is subjected to a constant force'F', the extension produced in the wire is '\Delta l' . Which of the following graphs is a straight line?

 

  • Option 1)

    \Delta l \:versus\:\frac{1}{l}

  • Option 2)

    \Delta l \:versus\:l^{2}

  • Option 3)

    \Delta l \:versus\:\frac{1}{l^{2}}

  • Option 4)

    \Delta l \:versus\:l

 
As discussed in Young Modulus - Ratio of normal stress to longitudnal strain it denoted by Y - wherein F -  applied force A -  Area  -  Change in lenght l - original length           Option 1) This solution is incorrect Option 2) This solution is correct Option 3) This solution is incorrect Option 4) This solution is incorrect
Medical
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A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' and volume 'V'. If 'T' is the surface tension of the liquid, then:

 

  • Option 1)

    energy =4VT \left( \frac{1}{r}- \frac{1}{R} \right )is\:\:released

  • Option 2)

    energy =3VT \left( \frac{1}{r}+ \frac{1}{R} \right )is\:\:absorbed

  • Option 3)

    energy =3VT \left( \frac{1}{r}- \frac{1}{R} \right )is\:\:released

  • Option 4)

    Energy is neither released nor absorbed.

 
As discussed Surface Energy - It is defined as the amount of work done in increasing the area of the liquid against surface tension. -    As surface area decreases so energy is released energy released =  Option 1) This solution is incorrect Option 2) This solution is incorrect Option 3) This solution is correct Option 4) Energy is neither released nor absorbed. This solution is incorrect
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