Thermodynamics Test

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Thermodynamics Test - 15

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Question 1
1 / -0

1st law of Thermodynamics can explain

A
Spontaneity of process

B
Perpetual machine of 2nd kind

C
Perpetual machine of 3rd kind

D
The total energy of an isolated system remains constant

Solution

The first law of thermodynamics states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed.
E=Q+W
Question 2
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According to 1st law of Thermodynamics

A
The energy of system is constant

B
The energy of universe is constant

C
The energy of surroundings is constant

D
The energy of system and surroundings are not constant

Solution

The law expresses that energy can be transformed, i.e. changed from one form to another, but cannot be created nor destroyed.
Therefore, energy of universe is constant.
Question 3
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First law of Thermodynamics is also known as

A
Law of conservation of energy

B
Law of conservation of mass

C
Law of multiple proportions

D
Law of disproportionation

Solution

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic system. The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed.
Question 4
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Closed system is

A
Perfectly sealed

B
Perfectly insulated

C
Both perfectly insulated and sealed

D
Neither insulated nor sealed

Solution

Closed system means no exchange of mass but there can be exchange of heat. So, it is perfectly sealed.
Question 5
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Which of the following statement is true about 1st law of Thermodynamics?

A
Energy is created nor destroyed

B
If particular form of energy disappears the equivalent quantity appears in same from

C
It is possible to construct a perpetual motion machine of first kind

D
Energy neither created not destroyed

Solution

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic system. The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed.
Question 6
1 / -0

According to 1st law of Thermodynamics,

A
Energy can be created but not destroyed

B
Energy cannot be created but can be destroyed

C
Energy can be created and destroyed

D
Energy can not be created nor destroyed

Solution

1st law of thermodynamics is a form of the law of conservation of energy i.e. energy cannot be created nor destroyed but can only transform itself.
Question 7
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The statement - 'Heat cannot flow from colder body to hotter body' is known as

A
1 st law of Thermodynamics

B
Zeroth law

C
2nd law of Thermodynamics

D
Law of conservation of energy

Solution

2nd law of Thermodynamics says that the heat cannot flow from colder body to hotter body.
Question 8
1 / -0

Mathematical representation of $$1^{st}$$ law of Thermodynamics

A
$$Q=\Delta E+W$$

B
$$\Delta H=\Delta E+P\Delta \vee $$

C
$$W=Q\times \Delta E$$

D
$$\Delta E=\Delta H+V\Delta P$$

Solution

$$Q=\Delta E+W$$

In mathematical representation of the1st law,
$$Q =$$ heat absorbed
$$W=$$ Work done by the system
$$\Delta E =$$ change in internal energy
Question 9
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Which of the following is a limitation of the 1st law of thermodynamics?

A
Energy neither created nor destroyed

B
Impossible to construct the 1st kind of perpetual motion machine

C
Law of conservation of energy

D
Spontaneous process are irreversible

Solution

The 1st law of thermodynamics alone does not predict the direction of a process, e.g.
Can a hot object naturally cool down to a temperature below its surrounding?
Can a hot mass return to its initial position by losing its internal energy?

The first law does not distinguish between reversible and irreversible processes
Question 10
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Zeroth law of thermodynamics was enunciated by

A
Clausius

B
Carnot

C
R.H. Fowler

D
Gibb

Solution

R. H Fowler brought about the concept of temperature and observed that if 2 bodies were at the same temperature and the second body was at the same temperature as a third, then the first and third bodies were also in thermal equilibrium

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Thermodynamics Test - 15

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Thermodynamics Test - 15

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Question 1

Spontaneity of process

Perpetual machine of 2nd kind

Perpetual machine of 3rd kind

The total energy of an isolated system remains constant

Solution

Question 2

The energy of system is constant

The energy of universe is constant

The energy of surroundings is constant

The energy of system and surroundings are not constant

Solution

Question 3

Law of conservation of energy

Law of conservation of mass

Law of multiple proportions

Law of disproportionation

Solution

Question 4

Perfectly sealed

Perfectly insulated

Both perfectly insulated and sealed

Neither insulated nor sealed

Solution

Question 5

Energy is created nor destroyed

If particular form of energy disappears the equivalent quantity appears in same from

It is possible to construct a perpetual motion machine of first kind

Energy neither created not destroyed

Solution

Question 6

Energy can be created but not destroyed

Energy cannot be created but can be destroyed

Energy can be created and destroyed

Energy can not be created nor destroyed

Solution

Question 7

1 st law of Thermodynamics

Zeroth law

2nd law of Thermodynamics

Law of conservation of energy

Solution

Question 8

$$Q=\Delta E+W$$

$$\Delta H=\Delta E+P\Delta \vee $$

$$W=Q\times \Delta E$$

$$\Delta E=\Delta H+V\Delta P$$

Solution

Question 9

Energy neither created nor destroyed

Impossible to construct the 1st kind of perpetual motion machine

Law of conservation of energy

Spontaneous process are irreversible

Solution

Question 10

Clausius

Carnot

R.H. Fowler

Gibb

Solution

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