# 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)
${{270}^{o}}C$

B)
${{230}^{o}}C$

C)
${{100}^{o}}C$

D)
${{50}^{o}}C$

• 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)
${{\alpha }_{1}}{{l}_{1}}={{\alpha }_{2}}{{l}_{2}}$

B)
${{\alpha }_{1}}{{l}_{2}}={{\alpha }_{2}}{{l}_{1}}$

C)
$\alpha _{1}^{2}{{l}_{2}}=\alpha _{2}^{2}{{l}_{1}}$

D)
${{\alpha }_{1}}l_{2}^{2}={{\alpha }_{2}}l_{1}^{2}$

• 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

B)
10.2 kW

C)
12.3 kW

D)
7.0 kW

• 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)
$78{}^\circ \,W$

B)
$117{}^\circ \,W$

C)
$200{}^\circ \,W$

D)
$139{}^\circ \,W$

• 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

B)
8.4 min

C)
12.6mm

D)
4.2 min

• 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)
$8\times {{10}^{4}}\,cal/K$

B)
80 cal/K

C)
293 cal/K

D)
273 cal/K

• 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

B)
31.5 g

C)
42.5 g

D)
22.5 g

• 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

B)
0.020

C)
0.025

D)
0.010

• 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)
${{\alpha }_{1}}{{\ell }_{2}}={{\alpha }_{2}}{{\ell }_{1}}$

B)
${{\alpha }_{1}}\ell _{2}^{2}={{\alpha }_{2}}\ell _{1}^{2}$

C)
$\alpha _{1}^{2}{{\ell }_{2}}=\alpha _{2}^{2}{{\ell }_{1}}$

D)
${{\alpha }_{1}}{{\ell }_{1}}={{\alpha }_{2}}{{\ell }_{2}}$

• 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

B)
544 km

C)
136 km

D)
68 km

• 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

B)
68 cm

C)
6.8 cm

D)
113.9 cm

• 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)
$\frac{9}{4}$

B)
$\frac{3}{2}$

C)
$\frac{5}{3}$

D)
$\frac{27}{8}$