Solved papers for NEET Physics Thermometry, Calorimetry & Thermal Expansion NEET PYQ-Thermometry, Calorimetry and Thermal Expansion

done NEET PYQ-Thermometry, Calorimetry and Thermal Expansion Total Questions - 12

• question_answer1) If 1 g of steam is mixed with 1 g of ice, then the resultant temperature of the mixture is:           [AIPMT 1999]
  A)
         \[{{270}^{o}}C\]       
  done clear
  B)
        \[{{230}^{o}}C\]
  done clear
  C)
   \[{{100}^{o}}C\]       
  done clear
  D)
        \[{{50}^{o}}C\]
  done clear
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• question_answer2) The coefficients of linear expansions of brass and steel are \[{{\alpha }_{1}}\] and \[{{\alpha }_{2}}\] respectively. When we take a brass rod of length \[{{l}_{1}}\] and a steel rod of length \[{{l}_{2}}\] at \[{{0}^{o}}C,\] then the difference in their lengths \[({{l}_{2}}-{{l}_{1}})\] will remain the same at all temperatures if:               [AIPMT 1999]
  A)
  \[{{\alpha }_{1}}{{l}_{1}}={{\alpha }_{2}}{{l}_{2}}\]
  done clear
  B)
        \[{{\alpha }_{1}}{{l}_{2}}={{\alpha }_{2}}{{l}_{1}}\]
  done clear
  C)
   \[\alpha _{1}^{2}{{l}_{2}}=\alpha _{2}^{2}{{l}_{1}}\]
  done clear
  D)
                    \[{{\alpha }_{1}}l_{2}^{2}={{\alpha }_{2}}l_{1}^{2}\]
  done clear
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• question_answer3) Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine?                                              [AIPMPT (S) 2008] \[(g=10\,\,m/{{s}^{2}})\]
  A)
   8.1 kW
  done clear
  B)
        10.2 kW
  done clear
  C)
   12.3 kW           
  done clear
  D)
        7.0 kW
  done clear
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• question_answer4) On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are \[39{}^\circ W\] and respectively. What will be the temperature on the new scale, corresponding to a temperature of \[39{}^\circ W\] on the Celsius scale?                                                                   [AIPMPT (S) 2008]
  A)
   \[78{}^\circ \,W\]        
  done clear
  B)
        \[117{}^\circ \,W\]
  done clear
  C)
   \[200{}^\circ \,W\]      
  done clear
  D)
        \[139{}^\circ \,W\]
  done clear
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• question_answer5) An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature\[20\,{}^\circ C\]? The temperature of boiling water is \[100\,{}^\circ C\].                                       [AIPMPT (S) 2008]
  A)
   6.3 min      
  done clear
  B)
        8.4 min
  done clear
  C)
   12.6mm        
  done clear
  D)
        4.2 min
  done clear
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• question_answer6) When 1 kg of ice at \[0{{\,}^{o}}C\] melts to water at \[0{{\,}^{o}}C,\] the resulting change in its entropy, taking latent heat of ice to be \[80\text{ }cal/{}^\circ C,\] is                                                             [AIPMT (S) 2011]
  A)
   \[8\times {{10}^{4}}\,cal/K\]
  done clear
  B)
        80 cal/K
  done clear
  C)
   293 cal/K   
  done clear
  D)
        273 cal/K
  done clear
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• question_answer7) Steam at \[100{}^\circ C\] is passed into 20 g of water at\[10{}^\circ C\]. When water acquires a temperature of \[80{}^\circ C,\] the mass of water present will be [Take specific heat of water \[=1\,\,cal\,\,{{g}^{-1}}{{\,}^{o}}{{C}^{-1}}\] and latent heat of steam \[=540\,\,cal\,\,{{g}^{-1}}\]]                                                 [NEET 2014]
  A)
   24 g                
  done clear
  B)
        31.5 g
  done clear
  C)
   42.5 g             
  done clear
  D)
        22.5 g
  done clear
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• question_answer8) The value of coefficient of volume expansion of glycerin is \[5\times {{10}^{-4}}{{K}^{-1}}\]. The fractional change in the density of glycerin for a rise of \[40\,{}^\circ C\] in its temperature is                            [NEET (Re) 2015]
  A)
   0.015             
  done clear
  B)
        0.020
  done clear
  C)
   0.025              
  done clear
  D)
        0.010
  done clear
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• question_answer9) Coefficient of linear expansion of brass and steel rods are \[{{\alpha }_{1}}\] and \[{{\alpha }_{2}}\]. Lengths of brass and steel rods are \[{{\ell }_{1}}\] and \[{{\ell }_{.2}}\] respectively. If \[({{\ell }_{2}}-{{\ell }_{1}})\] is maintained same at all temperatures, which one of the following relations holds good?                                     [NEET - 2016]
  A)
   \[{{\alpha }_{1}}{{\ell }_{2}}={{\alpha }_{2}}{{\ell }_{1}}\]  
  done clear
  B)
        \[{{\alpha }_{1}}\ell _{2}^{2}={{\alpha }_{2}}\ell _{1}^{2}\]
  done clear
  C)
   \[\alpha _{1}^{2}{{\ell }_{2}}=\alpha _{2}^{2}{{\ell }_{1}}\]           
  done clear
  D)
        \[{{\alpha }_{1}}{{\ell }_{1}}={{\alpha }_{2}}{{\ell }_{2}}\]
  done clear
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• question_answer10) 

  A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is :                                  [NEET - 2016]

  [Latent heat of ice is \[3.4\text{ }\times \text{ }{{10}^{5}}\text{ }J/kg\] anz\[g=10\text{ }N/kg\]]

  A)
   34 km
  done clear
  B)
        544 km
  done clear
  C)
   136 km            
  done clear
  D)
        68 km
  done clear
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• question_answer11) 

  A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is-                                                                       [NEET 2019]

  \[({{\alpha }_{Cu}}=1.7\times {{10}^{5}}\text{ }{{K}^{1}}\text{ }and\,{{\alpha }_{Al}}=\]\[~2.2\times {{10}^{5}}\text{ }{{K}^{1}})\]

  A)
   88 cm
  done clear
  B)
        68 cm
  done clear
  C)
   6.8 cm
  done clear
  D)
        113.9 cm
  done clear
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• question_answer12) The quantities of heat required to raise the temperature of two solid copper spheres of radii \[{{r}_{1}}\] and \[{{r}_{2}}\text{ (}{{r}_{1}}=1.5\text{ }{{r}_{2}})\] through 1 K are in the ratio:               [NEET 2020]
  A)
   \[\frac{9}{4}\]             
  done clear
  B)
        \[\frac{3}{2}\]
  done clear
  C)
   \[\frac{5}{3}\]             
  done clear
  D)
        \[\frac{27}{8}\]
  done clear
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