Thermodynamics Test

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Thermodynamics Test - 2

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Question 1
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Thermodynamics is the branch of physical science concerned with

A
heat and its transformations to and from other forms of energy

B
Potential and its transformations to and from other forms of energy

C
kinetic energy and its transformations to and from other forms of energy

D
mass and its transformations to and from other forms of energy

Solution

Thermodynamics deals with heat and its transformation from one form to another.

The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
Question 2
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In a closed system, Which of the following take place ?

A
The boundaries permit the flow of matter into it but not vice versa.

B
The boundaries prevent the flow of matter into or out of it.

C
The boundaries prevent the flow of matter out of it but not vice versa

D
The boundaries permit the flow of matter into or out of it

Solution

In a closed system, there is no flow of matter from system to surrounding or vice versa.

For example, a certain quantity of fluid bounded within a closed cylinder constitutes a closed system.
Question 3
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In an open system, which if the following take place ?

A
The boundaries permit the flow of matter into or out of it

B
The boundaries prevent the flow of matter but not of energy

C
The boundaries prevent the flow of energy into it

D
The boundaries prevent the flow of matter into or out of it

Solution

In open system there is flow of matter and energy in and out of the system or vice versa.

For example, an air compressor in which the air enters at a low pressure and exit at high pressure and there is energy interaction with the surrounding
Question 4
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first law of thermodynamics is a restatement of

A
law of conservation of energy

B
law of conservation of parity

C
law of conservation of charge

D
law of conservation of mass

Solution

It is restatement of law of conservation of energy.

It states that Thermodynamics isthe branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
Question 5
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According to first law of thermodynamics ΔU = q + w, here what is sign of q and w ?

A
'q' is negative if heat is transferred from the system and 'w' is negative if work is done by the system

B
'q' is positive if heat is transferred into the system and 'w' is positive if work is done on the system.

C
'q' is positive if heat is transferred into the system and 'w' is positive if work is done by the system.

D
'q' is negative if heat is transferred into the system and 'w' is negative if work is done on the system

Solution

The first law is simply a conservation of energy equation. q is positive if heat is added to the system, and negative if heat is removed; w is positive if work is done on the system, and negative if work is done by the system.
Question 6
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The correct equation for change in enthalpy is:

A
∆H = ∆U +n p/V

B
∆H = ∆U + p∆V

C
∆H = ∆U + p/V

D
∆H = ∆U + T∆V

Solution

Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
Question 7
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The molar specific heat capacity of a substance is the

A
quantity of heat needed to raise the temperature of one gram by one degree celsius

B
quantity of heat needed to raise the temperature of one kilogram by one degree Fahrenheit

C
quantity of heat needed to raise the temperature of one mole by one degree Fahrenheit

D
quantity of heat needed to raise the temperature of one mole by one degree celsius or one kelvin.

Solution

Molar specific heat capacity can be defined as the amount of heat energy required to raise the temperature of 1 mole of a substance by 1^oC.
Question 8
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The relationship between C_p and C_v for one mole of an ideal gas is

A
C_p− C_V= 2R

B
C_p+ C_V= R

C
C_pC_V= R

D
C_p− C_V= R

Solution

For a mole of ideal gas, The difference between C_p and C_v is always constant i.e. equals to gas constant.

Therefore, for one mole of an ideal gas, C_p- C_V= R

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Thermodynamics Test - 2

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Thermodynamics Test - 2

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Question 1

heat and its transformations to and from other forms of energy

Potential and its transformations to and from other forms of energy

kinetic energy and its transformations to and from other forms of energy

mass and its transformations to and from other forms of energy

Solution

Question 2

The boundaries permit the flow of matter into it but not vice versa.

The boundaries prevent the flow of matter into or out of it.

The boundaries prevent the flow of matter out of it but not vice versa

The boundaries permit the flow of matter into or out of it

Solution

Question 3

The boundaries permit the flow of matter into or out of it

The boundaries prevent the flow of matter but not of energy

The boundaries prevent the flow of energy into it

The boundaries prevent the flow of matter into or out of it

Solution

Question 4

law of conservation of energy

law of conservation of parity

law of conservation of charge

law of conservation of mass

Solution

Question 5

'q' is negative if heat is transferred from the system and 'w' is negative if work is done by the system

'q' is positive if heat is transferred into the system and 'w' is positive if work is done on the system.

'q' is positive if heat is transferred into the system and 'w' is positive if work is done by the system.

'q' is negative if heat is transferred into the system and 'w' is negative if work is done on the system

Solution

Question 6

∆H = ∆U +n p/V

∆H = ∆U + p∆V

∆H = ∆U + p/V

∆H = ∆U + T∆V

Solution

Question 7

quantity of heat needed to raise the temperature of one gram by one degree celsius

quantity of heat needed to raise the temperature of one kilogram by one degree Fahrenheit

quantity of heat needed to raise the temperature of one mole by one degree Fahrenheit

quantity of heat needed to raise the temperature of one mole by one degree celsius or one kelvin.

Solution

Question 8

Cp− CV= 2R

Cp + CV = R

CpCV= R

Cp− CV= R

Solution

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C_p− C_V= 2R

C_p+ C_V= R

C_pC_V= R

C_p− C_V= R