Question 2 :
Three perfect gases at absolute temperatures {tex} T _ { 1 } , T _ { 2 } {/tex} and {tex} T _ { 3 } {/tex} are mixed. The masses of molecules are {tex} m _ { 1 } , m _ { 2 } {/tex} and {tex} m _ { 3 } {/tex} and the number of molecules are {tex} n _ { 1 } , n _ { 2 } {/tex} and {tex} n _ { 3 } {/tex} respectively. Assuming no loss of energy, the final temperature of the mixture is:

Question 3 :
Two vessels separately contain two ideal gases {tex} A {/tex} and {tex} B {/tex} at the same temperature. The pressure of A being twice that of B. Under such conditions, the density of {tex} A {/tex} is found to be 1.5 times the density of {tex} B {/tex} . The ratio of molecular weight of {tex} A {/tex} and {tex} B {/tex} is:

Question 4 :
The density of a gas is {tex} 6 \times 10 ^ { - 2 } \mathrm { kg } / \mathrm { m } ^ { 3 } {/tex} and the root mean square velocity of the gas molecules is 500{tex} \mathrm { m } / \mathrm { s } {/tex} . The pressure exerted by the gas on the walls of the vessel is

Question 5 :
If 2 moles of an ideal monatomic gas at temperature {tex} \mathrm { T } _ { 0 } {/tex} is mixed with 4 moles of another ideal monatomic gas at temperature 2{tex} \mathrm { T } _ { 0 } {/tex} , then the temperature of the mixture is

Question 6 :
The kinetic theory of gases states that the average squared velocity of molecules varies linearly with the mean molecular weight of the gas. If the root mean square (rms) velocity of oxygen molecules at a certain temperature is 0.5{tex} \mathrm { km } / \mathrm { sec } {/tex} . The rms velocity for hydrogen molecules at the same temperature will be:

Question 7 :
Air is pumped into an automobile tube upto a pressure of 200{tex} \mathrm { kPa } {/tex} in the morning when the air temperature is {tex} 22 ^ { \circ } \mathrm { C } {/tex} . During the day, temperature rises to {tex} 42 ^ { \circ } \mathrm { C } {/tex} and the tube expands by 2{tex} \% {/tex} . The pressure of the air in the tube at this temperature, will be approximately

Question 8 :
The work of 146{tex} \mathrm { kJ } {/tex} is performed in order to compress one kilomole of gas adiabatically and in this process the temperature of the gas increases by {tex} 7 ^ { \circ } \mathrm { C } {/tex} . The gas is {tex} \left( R = 8.3 \mathrm { J } \mathrm { mol } ^ { - 1 } \mathrm { K } ^ { - 1 } \right) {/tex}

Question 9 :
At identical temperatures, the rms speed of hydrogen molecules is 4 times that for oxygen molecules. In a mixture of these in mass ratio {tex} \mathrm { H } _ { 2 } : \mathrm { O } _ { 2 } = 1.8 , {/tex} the rms speed of all molecules is n times the rms speed for {tex} \mathrm { O } _ { 2 } {/tex} , molecules, where {tex} \mathrm { n } {/tex} is

Question 10 :
Figure shows the variation in temperature {tex} ( \Delta \mathrm { T } ) {/tex} with the amount of heat supplied {tex} ( \mathrm { Q } ) {/tex} in an isobaric process corresponding to a monoatomic {tex} ( \mathrm {M } ) {/tex}, diatomic {tex} ( \mathrm {D } ) {/tex} and a polyatomic {tex} ( \mathrm {P } ) {/tex} gas. The initial state of all the gases are the same and the scales for the two axes coincide. Ignoring vibrational degrees of freedom, the lines {tex} a , b {/tex} and {tex} c {/tex} respectively correspond to<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5d5fcbafd3eb695bc07eb1e7">

Question 11 :
The temperature of a body on Kelvin scale is found to be $X\ K$. When it is measured by a Fahrenheit thermometer, it is found to be $X^o F$. Then $X$ is

Question 12 :
The point on the pressure temperature phase diagram where all the&#160;phases co-exist is called&#160;

Question 13 :
<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"></span></span><p class="wysiwyg-text-align-left">The heat change associated with reactions at constant volume is due to the difference in which property of the reactants and the products ?</p>

Question 14 :
The internal energy of a piece of lead when beaten by a hammer will

Question 15 :
At what temperature, the Fahrenheit scale reading is double of Celsius Scale reading?

Question 16 :
Hailstone at $0^{o}C$ falls from a height of $1\ km$ on an insulating surface converting whole of its kinetic energy into heat. What part of it will melt ? $(g=10\ m/s^{2}$)

Question 17 :
A mercury thermometer is transferred from melting ice to hot liquid.The mercury rises to 9/10 distance between two fixed points. Find the temperature in liquid in Fahrenheit scale

Question 18 :
The temperature of liquid hydrogen is $20\ K$.What is this temperature on the Fahrenheit scale?

Question 19 :
The amount of heat required to raise the temperature of 1 kilogram of water by $1\:^oC$ is called :<br/>

Question 20 :
On a hypothetical scale A the ice point is $42^o$ and the steam point is $182^o$ For another scale B, the ice point is $-10^o$ and steam point in $90^o$) If B reads $60^o$, the reading of A is,

Question 21 :
Pallet, and Boojho measured their body temperature. Paheli found her's to be $98.6^{o}\digamma$ and Boojho recorded $37^{o}C$.<br>Which of the following statement is true?

Question 22 :
Select the correct option given below:<br>Two absolute scale A and B have triple points of water defined to be at $200$ A and $350$ B.The relation between $T_A$ and $T_B$ is

Question 23 :
On which of the following scales of temperature, the temperature is never negative

Question 24 :
On a new scale of temperature (which is linear) and called the&#160;W scale, the freezing and boiling points of water are 39&#176;W and 239&#176;W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39&#176;C on the Celsius scale ?

Question 25 :
Assertion: Fahrenheit is the smallest unit measuring temperature. Reason: Fahrenheit was the first temperature scale used for measuring temperature.

Question 26 :
If the difference of temperature of two bodies is $5^oC$, then the difference of temperature on Kelvin scale is

Question 27 :
An ideal monoatomic gas undergoes a process in which its internal energy U and density $\rho$ vary as $U\rho\, =\, constant.$ The ratio of change in internal energy and the work done by the gas is

Question 28 :
A gas mixture consists of $2$ moles of $O_2$ and $4$ moles of Ar at temperature $T$. Neglecting all vibrational modes, the total internal energy of the system is <br>

Question 29 :
Assertion: The lowest attainable temperature is absolute zero,i.e.,$0K=-273.15^oC.$ Reason: Size of each degree on Kelvin scale is same as that on Celsius scale.

Question 31 :
In a thermodynamic system working subtance is ideal gas, its internal energy is in the from of

Question 32 :
One calorie is defined as the heat required to raise the temperature of $1 \ gm$ of water by $1^{o}\mathrm{C}$ in a certain pressure. The pressure is<br/>

Question 33 :
Assertion: The internal energy of an isothermal process does not change. Reason: The internal energy of a system depend only on pressure of the system

Question 34 :
Two absolute scale A and B have triple points of water defined to be at 200 A an 350 B. The relation between&#160;$T _ { A }$&#160;and $T _ { B }$&#160;&#160;is

Question 35 :
The internal energy $U$ is a unique function of any state because change in $U$.

Question 36 :
In which of the processes, does the internal energy of the system remain constant?

Question 38 :
In a sports meet the timing of a $200\ m$ straight dash is recorded at the finish point by starting an accurate stop watch on hearing the sound of starting gun fired at the starting point. The time recorded will be more accurate

Question 40 :
The triple point of carbon dioxide is $216.55\,K$ the corresponding temperature on the celsius and Fahrenheit scale respectively are: