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PHXI12:THERMODYNAMICS

371332 The state of a thermodynamic system is represented by

1 pressure only

2 volume only

3 pressure, volume and temperature

4 number of moles

Explanation:

In thermodynamics, the value of a state variable depends only on the particular state not on the path used to attain that state. Pressure $(p)$ , volume $(V)$ , temperature $(T)$ and mass $(m)$ are state variables.

PHXI12:THERMODYNAMICS

371333 At $27^{\circ} C,$ a motor car tyre has pressure of $2 a t m .$ The temperature at which the tyre suddenly burst will be (take, $γ_{air} = 1.4$ )

1

246.1 K

2

250 K

3

290 K

4

248 K

Explanation:

When a system undergoes a sudden change under condition that no exchange of heat takes place between the system and surroundings, then such a process is called adiabatic. So, a tyre bursting suddenly an adiabatic process.
$p^{1 - γ} T^{γ} = constant$
where, $γ$ is ratio of specific heats, $p$ is pressure and $T$ is temperature.
$∴ {(\frac{p_{2}}{p_{1}})}^{γ - 1} = {(\frac{T_{2}}{T_{1}})}^{γ}$
$\Rightarrow {(\frac{1}{2})}^{0.4} = {(\frac{T_{2}}{300})}^{1.4}$
$∴ 0.4 [\log 1 - \log 2]$
$= 1.4 [\log T_{2} - \log 300]$
$\Rightarrow T_{2} = 246.1 K$

PHXI12:THERMODYNAMICS

371334 Assertion :
In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.
Reason :
The impurities in water bring down its boiling point.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI12:THERMODYNAMICS

371335 Which of the following statements is correct for any thermodynamic system?

1 Internal energy and entropy are state functions

2 The change in entropy can never be zero

3 The work done in an adiabatic process is always zero.

4 The internal energy changes in all processes

PHXI12:THERMODYNAMICS

371336 Microwave oven acts on the principle of :

1 Giving rotational energy to water molecules

2 Giving vibrational energy to water molecules

3 Giving translational energy to water molecules

4 Transferring electrons from lower to higher
energy levels in water molecule

JEE - 2016

PHXI12:THERMODYNAMICS

371332 The state of a thermodynamic system is represented by

1 pressure only

2 volume only

3 pressure, volume and temperature

4 number of moles

Explanation:

In thermodynamics, the value of a state variable depends only on the particular state not on the path used to attain that state. Pressure $(p)$ , volume $(V)$ , temperature $(T)$ and mass $(m)$ are state variables.

PHXI12:THERMODYNAMICS

371333 At $27^{\circ} C,$ a motor car tyre has pressure of $2 a t m .$ The temperature at which the tyre suddenly burst will be (take, $γ_{air} = 1.4$ )

1

246.1 K

2

250 K

3

290 K

4

248 K

Explanation:

When a system undergoes a sudden change under condition that no exchange of heat takes place between the system and surroundings, then such a process is called adiabatic. So, a tyre bursting suddenly an adiabatic process.
$p^{1 - γ} T^{γ} = constant$
where, $γ$ is ratio of specific heats, $p$ is pressure and $T$ is temperature.
$∴ {(\frac{p_{2}}{p_{1}})}^{γ - 1} = {(\frac{T_{2}}{T_{1}})}^{γ}$
$\Rightarrow {(\frac{1}{2})}^{0.4} = {(\frac{T_{2}}{300})}^{1.4}$
$∴ 0.4 [\log 1 - \log 2]$
$= 1.4 [\log T_{2} - \log 300]$
$\Rightarrow T_{2} = 246.1 K$

PHXI12:THERMODYNAMICS

371334 Assertion :
In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.
Reason :
The impurities in water bring down its boiling point.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI12:THERMODYNAMICS

371335 Which of the following statements is correct for any thermodynamic system?

1 Internal energy and entropy are state functions

2 The change in entropy can never be zero

3 The work done in an adiabatic process is always zero.

4 The internal energy changes in all processes

PHXI12:THERMODYNAMICS

371336 Microwave oven acts on the principle of :

1 Giving rotational energy to water molecules

2 Giving vibrational energy to water molecules

3 Giving translational energy to water molecules

4 Transferring electrons from lower to higher
energy levels in water molecule

JEE - 2016

PHXI12:THERMODYNAMICS

371332 The state of a thermodynamic system is represented by

1 pressure only

2 volume only

3 pressure, volume and temperature

4 number of moles

Explanation:

In thermodynamics, the value of a state variable depends only on the particular state not on the path used to attain that state. Pressure $(p)$ , volume $(V)$ , temperature $(T)$ and mass $(m)$ are state variables.

PHXI12:THERMODYNAMICS

371333 At $27^{\circ} C,$ a motor car tyre has pressure of $2 a t m .$ The temperature at which the tyre suddenly burst will be (take, $γ_{air} = 1.4$ )

1

246.1 K

2

250 K

3

290 K

4

248 K

Explanation:

When a system undergoes a sudden change under condition that no exchange of heat takes place between the system and surroundings, then such a process is called adiabatic. So, a tyre bursting suddenly an adiabatic process.
$p^{1 - γ} T^{γ} = constant$
where, $γ$ is ratio of specific heats, $p$ is pressure and $T$ is temperature.
$∴ {(\frac{p_{2}}{p_{1}})}^{γ - 1} = {(\frac{T_{2}}{T_{1}})}^{γ}$
$\Rightarrow {(\frac{1}{2})}^{0.4} = {(\frac{T_{2}}{300})}^{1.4}$
$∴ 0.4 [\log 1 - \log 2]$
$= 1.4 [\log T_{2} - \log 300]$
$\Rightarrow T_{2} = 246.1 K$

PHXI12:THERMODYNAMICS

371334 Assertion :
In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.
Reason :
The impurities in water bring down its boiling point.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI12:THERMODYNAMICS

371335 Which of the following statements is correct for any thermodynamic system?

1 Internal energy and entropy are state functions

2 The change in entropy can never be zero

3 The work done in an adiabatic process is always zero.

4 The internal energy changes in all processes

PHXI12:THERMODYNAMICS

371336 Microwave oven acts on the principle of :

1 Giving rotational energy to water molecules

2 Giving vibrational energy to water molecules

3 Giving translational energy to water molecules

4 Transferring electrons from lower to higher
energy levels in water molecule

JEE - 2016

PHXI12:THERMODYNAMICS

371332 The state of a thermodynamic system is represented by

1 pressure only

2 volume only

3 pressure, volume and temperature

4 number of moles

Explanation:

In thermodynamics, the value of a state variable depends only on the particular state not on the path used to attain that state. Pressure $(p)$ , volume $(V)$ , temperature $(T)$ and mass $(m)$ are state variables.

PHXI12:THERMODYNAMICS

371333 At $27^{\circ} C,$ a motor car tyre has pressure of $2 a t m .$ The temperature at which the tyre suddenly burst will be (take, $γ_{air} = 1.4$ )

1

246.1 K

2

250 K

3

290 K

4

248 K

Explanation:

When a system undergoes a sudden change under condition that no exchange of heat takes place between the system and surroundings, then such a process is called adiabatic. So, a tyre bursting suddenly an adiabatic process.
$p^{1 - γ} T^{γ} = constant$
where, $γ$ is ratio of specific heats, $p$ is pressure and $T$ is temperature.
$∴ {(\frac{p_{2}}{p_{1}})}^{γ - 1} = {(\frac{T_{2}}{T_{1}})}^{γ}$
$\Rightarrow {(\frac{1}{2})}^{0.4} = {(\frac{T_{2}}{300})}^{1.4}$
$∴ 0.4 [\log 1 - \log 2]$
$= 1.4 [\log T_{2} - \log 300]$
$\Rightarrow T_{2} = 246.1 K$

PHXI12:THERMODYNAMICS

371334 Assertion :
In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.
Reason :
The impurities in water bring down its boiling point.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI12:THERMODYNAMICS

371335 Which of the following statements is correct for any thermodynamic system?

1 Internal energy and entropy are state functions

2 The change in entropy can never be zero

3 The work done in an adiabatic process is always zero.

4 The internal energy changes in all processes

PHXI12:THERMODYNAMICS

371336 Microwave oven acts on the principle of :

1 Giving rotational energy to water molecules

2 Giving vibrational energy to water molecules

3 Giving translational energy to water molecules

4 Transferring electrons from lower to higher
energy levels in water molecule

JEE - 2016

PHXI12:THERMODYNAMICS

371332 The state of a thermodynamic system is represented by

1 pressure only

2 volume only

3 pressure, volume and temperature

4 number of moles

Explanation:

In thermodynamics, the value of a state variable depends only on the particular state not on the path used to attain that state. Pressure $(p)$ , volume $(V)$ , temperature $(T)$ and mass $(m)$ are state variables.

PHXI12:THERMODYNAMICS

371333 At $27^{\circ} C,$ a motor car tyre has pressure of $2 a t m .$ The temperature at which the tyre suddenly burst will be (take, $γ_{air} = 1.4$ )

1

246.1 K

2

250 K

3

290 K

4

248 K

Explanation:

When a system undergoes a sudden change under condition that no exchange of heat takes place between the system and surroundings, then such a process is called adiabatic. So, a tyre bursting suddenly an adiabatic process.
$p^{1 - γ} T^{γ} = constant$
where, $γ$ is ratio of specific heats, $p$ is pressure and $T$ is temperature.
$∴ {(\frac{p_{2}}{p_{1}})}^{γ - 1} = {(\frac{T_{2}}{T_{1}})}^{γ}$
$\Rightarrow {(\frac{1}{2})}^{0.4} = {(\frac{T_{2}}{300})}^{1.4}$
$∴ 0.4 [\log 1 - \log 2]$
$= 1.4 [\log T_{2} - \log 300]$
$\Rightarrow T_{2} = 246.1 K$

PHXI12:THERMODYNAMICS

371334 Assertion :
In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.
Reason :
The impurities in water bring down its boiling point.

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI12:THERMODYNAMICS

371335 Which of the following statements is correct for any thermodynamic system?

1 Internal energy and entropy are state functions

2 The change in entropy can never be zero

3 The work done in an adiabatic process is always zero.

4 The internal energy changes in all processes

PHXI12:THERMODYNAMICS

371336 Microwave oven acts on the principle of :

1 Giving rotational energy to water molecules

2 Giving vibrational energy to water molecules

3 Giving translational energy to water molecules

4 Transferring electrons from lower to higher
energy levels in water molecule

JEE - 2016

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