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CHXI06:THERMODYNAMICS

369334 Mathematical equation of first law of thermodynamics for isochoric process is

1

Δ U = q_{v}

2

- Δ U = q_{v}

3

q = - W

4

Δ U = W

Explanation:

For an isochoric process, $Δ V = 0$
In this process, the first law of thermodynamics
$q = Δ U - W q = Δ U - p Δ V As Δ V = 0 q_{v} = Δ U$

MHTCET - 2016

CHXI06:THERMODYNAMICS

369335 When $x kJ$ heat is provided to a system, work equivalent to $yJ$ is done on it. What is internal energy change during this operation?

1

(1000 x + y) J

2

1000(x + y) J

3

(x + 1000 y) J

4

x  +  yJ

Explanation:

$Q =+ x k J = 1000 x J, W = +y J$
According to first law of thermodynamics,
$Δ U = Q + W$
$= (1000 x + y) J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369336 When 1 mole of gas is heated at constant volume, the temperature rises from $273 K$ to $546 K$ . If heat supplied to the gas is $xJ$ , then find the correct statement from the following.

1

Q  = Δ U  =  xJ, W  =  0

2

Q = W = xJ, Δ V = 0

3

Δ V = 0, Q = W = - xJ

4

Q = - W = xJ, Δ V = 0

Explanation:

At constant volume, $Δ V = 0$
Workdone, $W = - P Δ V = 0$
According to first law of thermodynamics
$Δ U = Q + W$
$∴ Δ U = Q = x J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369337 In a process, a system performs $238 J$ of work on it's surrounding by absorbing $54 J$ of heat. What is the change in internal energy of system during this operation?

1

222 J

2

- 192 J

3

54 J

4

- 184 J

Explanation:

$W = - 238 J$ (workdone by the system), $Q = 54 J$ (heat absorbed $)$
According to first law of thermodynamics,
$Δ U = Q + W$
$= 54 - 238 = - 184 J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369338 Assertion :
First law of thermodynamics is identical to the law of conservation of energy.
Reason :
It states that the total energy of the universe is constant.

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

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

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI06:THERMODYNAMICS

369334 Mathematical equation of first law of thermodynamics for isochoric process is

1

Δ U = q_{v}

2

- Δ U = q_{v}

3

q = - W

4

Δ U = W

Explanation:

For an isochoric process, $Δ V = 0$
In this process, the first law of thermodynamics
$q = Δ U - W q = Δ U - p Δ V As Δ V = 0 q_{v} = Δ U$

MHTCET - 2016

CHXI06:THERMODYNAMICS

369335 When $x kJ$ heat is provided to a system, work equivalent to $yJ$ is done on it. What is internal energy change during this operation?

1

(1000 x + y) J

2

1000(x + y) J

3

(x + 1000 y) J

4

x  +  yJ

Explanation:

$Q =+ x k J = 1000 x J, W = +y J$
According to first law of thermodynamics,
$Δ U = Q + W$
$= (1000 x + y) J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369336 When 1 mole of gas is heated at constant volume, the temperature rises from $273 K$ to $546 K$ . If heat supplied to the gas is $xJ$ , then find the correct statement from the following.

1

Q  = Δ U  =  xJ, W  =  0

2

Q = W = xJ, Δ V = 0

3

Δ V = 0, Q = W = - xJ

4

Q = - W = xJ, Δ V = 0

Explanation:

At constant volume, $Δ V = 0$
Workdone, $W = - P Δ V = 0$
According to first law of thermodynamics
$Δ U = Q + W$
$∴ Δ U = Q = x J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369337 In a process, a system performs $238 J$ of work on it's surrounding by absorbing $54 J$ of heat. What is the change in internal energy of system during this operation?

1

222 J

2

- 192 J

3

54 J

4

- 184 J

Explanation:

$W = - 238 J$ (workdone by the system), $Q = 54 J$ (heat absorbed $)$
According to first law of thermodynamics,
$Δ U = Q + W$
$= 54 - 238 = - 184 J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369338 Assertion :
First law of thermodynamics is identical to the law of conservation of energy.
Reason :
It states that the total energy of the universe is constant.

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

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

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI06:THERMODYNAMICS

369334 Mathematical equation of first law of thermodynamics for isochoric process is

1

Δ U = q_{v}

2

- Δ U = q_{v}

3

q = - W

4

Δ U = W

Explanation:

For an isochoric process, $Δ V = 0$
In this process, the first law of thermodynamics
$q = Δ U - W q = Δ U - p Δ V As Δ V = 0 q_{v} = Δ U$

MHTCET - 2016

CHXI06:THERMODYNAMICS

369335 When $x kJ$ heat is provided to a system, work equivalent to $yJ$ is done on it. What is internal energy change during this operation?

1

(1000 x + y) J

2

1000(x + y) J

3

(x + 1000 y) J

4

x  +  yJ

Explanation:

$Q =+ x k J = 1000 x J, W = +y J$
According to first law of thermodynamics,
$Δ U = Q + W$
$= (1000 x + y) J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369336 When 1 mole of gas is heated at constant volume, the temperature rises from $273 K$ to $546 K$ . If heat supplied to the gas is $xJ$ , then find the correct statement from the following.

1

Q  = Δ U  =  xJ, W  =  0

2

Q = W = xJ, Δ V = 0

3

Δ V = 0, Q = W = - xJ

4

Q = - W = xJ, Δ V = 0

Explanation:

At constant volume, $Δ V = 0$
Workdone, $W = - P Δ V = 0$
According to first law of thermodynamics
$Δ U = Q + W$
$∴ Δ U = Q = x J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369337 In a process, a system performs $238 J$ of work on it's surrounding by absorbing $54 J$ of heat. What is the change in internal energy of system during this operation?

1

222 J

2

- 192 J

3

54 J

4

- 184 J

Explanation:

$W = - 238 J$ (workdone by the system), $Q = 54 J$ (heat absorbed $)$
According to first law of thermodynamics,
$Δ U = Q + W$
$= 54 - 238 = - 184 J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369338 Assertion :
First law of thermodynamics is identical to the law of conservation of energy.
Reason :
It states that the total energy of the universe is constant.

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

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

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI06:THERMODYNAMICS

369334 Mathematical equation of first law of thermodynamics for isochoric process is

1

Δ U = q_{v}

2

- Δ U = q_{v}

3

q = - W

4

Δ U = W

Explanation:

For an isochoric process, $Δ V = 0$
In this process, the first law of thermodynamics
$q = Δ U - W q = Δ U - p Δ V As Δ V = 0 q_{v} = Δ U$

MHTCET - 2016

CHXI06:THERMODYNAMICS

369335 When $x kJ$ heat is provided to a system, work equivalent to $yJ$ is done on it. What is internal energy change during this operation?

1

(1000 x + y) J

2

1000(x + y) J

3

(x + 1000 y) J

4

x  +  yJ

Explanation:

$Q =+ x k J = 1000 x J, W = +y J$
According to first law of thermodynamics,
$Δ U = Q + W$
$= (1000 x + y) J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369336 When 1 mole of gas is heated at constant volume, the temperature rises from $273 K$ to $546 K$ . If heat supplied to the gas is $xJ$ , then find the correct statement from the following.

1

Q  = Δ U  =  xJ, W  =  0

2

Q = W = xJ, Δ V = 0

3

Δ V = 0, Q = W = - xJ

4

Q = - W = xJ, Δ V = 0

Explanation:

At constant volume, $Δ V = 0$
Workdone, $W = - P Δ V = 0$
According to first law of thermodynamics
$Δ U = Q + W$
$∴ Δ U = Q = x J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369337 In a process, a system performs $238 J$ of work on it's surrounding by absorbing $54 J$ of heat. What is the change in internal energy of system during this operation?

1

222 J

2

- 192 J

3

54 J

4

- 184 J

Explanation:

$W = - 238 J$ (workdone by the system), $Q = 54 J$ (heat absorbed $)$
According to first law of thermodynamics,
$Δ U = Q + W$
$= 54 - 238 = - 184 J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369338 Assertion :
First law of thermodynamics is identical to the law of conservation of energy.
Reason :
It states that the total energy of the universe is constant.

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

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

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXI06:THERMODYNAMICS

369334 Mathematical equation of first law of thermodynamics for isochoric process is

1

Δ U = q_{v}

2

- Δ U = q_{v}

3

q = - W

4

Δ U = W

Explanation:

For an isochoric process, $Δ V = 0$
In this process, the first law of thermodynamics
$q = Δ U - W q = Δ U - p Δ V As Δ V = 0 q_{v} = Δ U$

MHTCET - 2016

CHXI06:THERMODYNAMICS

369335 When $x kJ$ heat is provided to a system, work equivalent to $yJ$ is done on it. What is internal energy change during this operation?

1

(1000 x + y) J

2

1000(x + y) J

3

(x + 1000 y) J

4

x  +  yJ

Explanation:

$Q =+ x k J = 1000 x J, W = +y J$
According to first law of thermodynamics,
$Δ U = Q + W$
$= (1000 x + y) J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369336 When 1 mole of gas is heated at constant volume, the temperature rises from $273 K$ to $546 K$ . If heat supplied to the gas is $xJ$ , then find the correct statement from the following.

1

Q  = Δ U  =  xJ, W  =  0

2

Q = W = xJ, Δ V = 0

3

Δ V = 0, Q = W = - xJ

4

Q = - W = xJ, Δ V = 0

Explanation:

At constant volume, $Δ V = 0$
Workdone, $W = - P Δ V = 0$
According to first law of thermodynamics
$Δ U = Q + W$
$∴ Δ U = Q = x J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369337 In a process, a system performs $238 J$ of work on it's surrounding by absorbing $54 J$ of heat. What is the change in internal energy of system during this operation?

1

222 J

2

- 192 J

3

54 J

4

- 184 J

Explanation:

$W = - 238 J$ (workdone by the system), $Q = 54 J$ (heat absorbed $)$
According to first law of thermodynamics,
$Δ U = Q + W$
$= 54 - 238 = - 184 J$

MHTCET - 2021

CHXI06:THERMODYNAMICS

369338 Assertion :
First law of thermodynamics is identical to the law of conservation of energy.
Reason :
It states that the total energy of the universe is constant.

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

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

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

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