00. First and Zeroth Law of Thermodynamics
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Thermodynamics

148174 $10 \mathrm{~g}$ of water at $70^{\circ} \mathrm{C}$ is mixed with $5 \mathrm{~g}$ of water at $30^{\circ} \mathrm{C}$. Find the temperature of the mixture in equilibrium.

1 $33.33^{\circ} \mathrm{C}$
2 $56.67^{\circ} \mathrm{C}$
3 $77.66^{\circ} \mathrm{C}$
4 $30^{\circ} \mathrm{C}$
AP EMCET(Medical)-2008
Thermodynamics

148178 Ice starts forming in a lake with water at $0^{\circ} \mathrm{C}$, when the atmospheric temperature is $-10^{\circ} \mathrm{C}$, If the time taken for $1 \mathrm{~cm}$ of ice to be formed is 7 hours, the time thken for the thickness of ice of change from $1 \mathrm{~cm}$ to $2 \mathrm{~cm}$ is (in hours)

1 3.5
2 7
3 14
4 21
AP EAMCET-28.04.2017
Thermodynamics

148069 Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason R.
Assertion $\mathrm{A}$ : If $\mathrm{dQ}$ and $\mathrm{dW}$ represent the heat supplied to the system and the work done on the system respectively. Then according the first law of thermodynamics $d Q=d U-d W$.
Reason $R$ : First law of thermodynamics is based on law of conservation of energy.
In the light of the above statements, choose the correct answer form the options given below:

1 Both $\mathrm{A}$ and $\mathrm{R}$ are correct but $\mathrm{R}$ is not the correct explanation of $A$
2 $\mathrm{A}$ is correct but $\mathrm{R}$ is not correct
3 $A$ is not correct but $R$ is correct
4 Both A and R are correct and R is the correct explanation of $A$
JEE Main-29.01.2023
Thermodynamics

148092 Which of the following process is possible according to the first law of thermodynamics-

1 $\mathrm{W}>0, \mathrm{Q} \lt 0$ and $\mathrm{dU}=0$
2 W $>0$, Q $ \lt 0$ and $\mathrm{dU}>0$
3 W $>0$, Q $ \lt 0$ and dU $ \lt 0$
4 W $ \lt 0$, Q $>0$ and dU $ \lt 0$
BITSAT-2012
NEET DIGITAL LIBRARY
Thermodynamics

148174 $10 \mathrm{~g}$ of water at $70^{\circ} \mathrm{C}$ is mixed with $5 \mathrm{~g}$ of water at $30^{\circ} \mathrm{C}$. Find the temperature of the mixture in equilibrium.

1 $33.33^{\circ} \mathrm{C}$
2 $56.67^{\circ} \mathrm{C}$
3 $77.66^{\circ} \mathrm{C}$
4 $30^{\circ} \mathrm{C}$
AP EMCET(Medical)-2008
Thermodynamics

148178 Ice starts forming in a lake with water at $0^{\circ} \mathrm{C}$, when the atmospheric temperature is $-10^{\circ} \mathrm{C}$, If the time taken for $1 \mathrm{~cm}$ of ice to be formed is 7 hours, the time thken for the thickness of ice of change from $1 \mathrm{~cm}$ to $2 \mathrm{~cm}$ is (in hours)

1 3.5
2 7
3 14
4 21
AP EAMCET-28.04.2017
Thermodynamics

148069 Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason R.
Assertion $\mathrm{A}$ : If $\mathrm{dQ}$ and $\mathrm{dW}$ represent the heat supplied to the system and the work done on the system respectively. Then according the first law of thermodynamics $d Q=d U-d W$.
Reason $R$ : First law of thermodynamics is based on law of conservation of energy.
In the light of the above statements, choose the correct answer form the options given below:

1 Both $\mathrm{A}$ and $\mathrm{R}$ are correct but $\mathrm{R}$ is not the correct explanation of $A$
2 $\mathrm{A}$ is correct but $\mathrm{R}$ is not correct
3 $A$ is not correct but $R$ is correct
4 Both A and R are correct and R is the correct explanation of $A$
JEE Main-29.01.2023
Thermodynamics

148092 Which of the following process is possible according to the first law of thermodynamics-

1 $\mathrm{W}>0, \mathrm{Q} \lt 0$ and $\mathrm{dU}=0$
2 W $>0$, Q $ \lt 0$ and $\mathrm{dU}>0$
3 W $>0$, Q $ \lt 0$ and dU $ \lt 0$
4 W $ \lt 0$, Q $>0$ and dU $ \lt 0$
BITSAT-2012
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Thermodynamics

148174 $10 \mathrm{~g}$ of water at $70^{\circ} \mathrm{C}$ is mixed with $5 \mathrm{~g}$ of water at $30^{\circ} \mathrm{C}$. Find the temperature of the mixture in equilibrium.

1 $33.33^{\circ} \mathrm{C}$
2 $56.67^{\circ} \mathrm{C}$
3 $77.66^{\circ} \mathrm{C}$
4 $30^{\circ} \mathrm{C}$
AP EMCET(Medical)-2008
Thermodynamics

148178 Ice starts forming in a lake with water at $0^{\circ} \mathrm{C}$, when the atmospheric temperature is $-10^{\circ} \mathrm{C}$, If the time taken for $1 \mathrm{~cm}$ of ice to be formed is 7 hours, the time thken for the thickness of ice of change from $1 \mathrm{~cm}$ to $2 \mathrm{~cm}$ is (in hours)

1 3.5
2 7
3 14
4 21
AP EAMCET-28.04.2017
Thermodynamics

148069 Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason R.
Assertion $\mathrm{A}$ : If $\mathrm{dQ}$ and $\mathrm{dW}$ represent the heat supplied to the system and the work done on the system respectively. Then according the first law of thermodynamics $d Q=d U-d W$.
Reason $R$ : First law of thermodynamics is based on law of conservation of energy.
In the light of the above statements, choose the correct answer form the options given below:

1 Both $\mathrm{A}$ and $\mathrm{R}$ are correct but $\mathrm{R}$ is not the correct explanation of $A$
2 $\mathrm{A}$ is correct but $\mathrm{R}$ is not correct
3 $A$ is not correct but $R$ is correct
4 Both A and R are correct and R is the correct explanation of $A$
JEE Main-29.01.2023
Thermodynamics

148092 Which of the following process is possible according to the first law of thermodynamics-

1 $\mathrm{W}>0, \mathrm{Q} \lt 0$ and $\mathrm{dU}=0$
2 W $>0$, Q $ \lt 0$ and $\mathrm{dU}>0$
3 W $>0$, Q $ \lt 0$ and dU $ \lt 0$
4 W $ \lt 0$, Q $>0$ and dU $ \lt 0$
BITSAT-2012
For More Updates join with Us
Thermodynamics

148174 $10 \mathrm{~g}$ of water at $70^{\circ} \mathrm{C}$ is mixed with $5 \mathrm{~g}$ of water at $30^{\circ} \mathrm{C}$. Find the temperature of the mixture in equilibrium.

1 $33.33^{\circ} \mathrm{C}$
2 $56.67^{\circ} \mathrm{C}$
3 $77.66^{\circ} \mathrm{C}$
4 $30^{\circ} \mathrm{C}$
AP EMCET(Medical)-2008
Thermodynamics

148178 Ice starts forming in a lake with water at $0^{\circ} \mathrm{C}$, when the atmospheric temperature is $-10^{\circ} \mathrm{C}$, If the time taken for $1 \mathrm{~cm}$ of ice to be formed is 7 hours, the time thken for the thickness of ice of change from $1 \mathrm{~cm}$ to $2 \mathrm{~cm}$ is (in hours)

1 3.5
2 7
3 14
4 21
AP EAMCET-28.04.2017
Thermodynamics

148069 Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason R.
Assertion $\mathrm{A}$ : If $\mathrm{dQ}$ and $\mathrm{dW}$ represent the heat supplied to the system and the work done on the system respectively. Then according the first law of thermodynamics $d Q=d U-d W$.
Reason $R$ : First law of thermodynamics is based on law of conservation of energy.
In the light of the above statements, choose the correct answer form the options given below:

1 Both $\mathrm{A}$ and $\mathrm{R}$ are correct but $\mathrm{R}$ is not the correct explanation of $A$
2 $\mathrm{A}$ is correct but $\mathrm{R}$ is not correct
3 $A$ is not correct but $R$ is correct
4 Both A and R are correct and R is the correct explanation of $A$
JEE Main-29.01.2023
Thermodynamics

148092 Which of the following process is possible according to the first law of thermodynamics-

1 $\mathrm{W}>0, \mathrm{Q} \lt 0$ and $\mathrm{dU}=0$
2 W $>0$, Q $ \lt 0$ and $\mathrm{dU}>0$
3 W $>0$, Q $ \lt 0$ and dU $ \lt 0$
4 W $ \lt 0$, Q $>0$ and dU $ \lt 0$
BITSAT-2012