Thermodynamics Test

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Thermodynamics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

For solids near room temperature the molar specific heat (R is the universal gas constant)

A
R

B
2R

C
3R

D
5R

Solution

The molar specific heats of solids also demonstrate a marked temperature dependence. Solids have molar specific heats that generally decrease in a nonlinear manner with decreasing temperature and approach zero as the temperature approaches absolute zero. At high temperatures (usually above 300 K), the molar specific heats approach the value of 3R ≈ 25 J/mol.K, a result known as the DuLong–Petit law.
Question 2
1 / -0

In Thermodynamics Extensive variables depend

A
on the ‘size’ of the system

B
on the ‘pressure’ of the system

C
on the ‘temperature’ of the system

D
on the ‘entropy’ of the system

Solution

The variables which depend on the size or amount of the substance are called extensive variables.

Example: Mass, volume etc
Question 3
1 / -0

In a quasi-static process,

A
the temperature of the surrounding reservoir and the external pressure equal the temperature and pressure of the system

B
the temperature of the surrounding reservoir and the external pressure differ only infinitesimally from the temperature and pressure of the system

C
the temperature of the surrounding reservoir differ only infinitesimally from the temperature of the system

D
the temperature of the surrounding reservoir and the external pressure differ substantially from the temperature and pressure of the system

Solution

A quasi-static process is a thermodynamic process that happens slowly enough for the system to remain in internal equilibrium.
Question 4
1 / -0

In which type of process is the volume constant

A
Isobaric process

B
Isothermal process

C
Adiabatic process

D
Isochoric process

Solution

An isochoric process is a thermodynamic process during which the volume of the closed system undergoing such a process remains constant.
Question 5
1 / -0

The heat engine takes

A
heat Q₁ from a cold reservoir at temperature T₁, releases heat Q₂ to a cold reservoir at temperature T₂ and delivers work W to the surroundings

B
heat Q₁ from a cold reservoir at temperature T₁, releases heat Q₂ to a hot reservoir at temperature T₂ and delivers work W to the surroundings

C
heat Q₁ from a hot reservoir at temperature T₁ , releases heat Q₂ to a cold reservoir at temperature T₂ and delivers work W to the surroundings

D
heat Q₁ from a hot reservoir at temperature T₁, releases heat Q₂ to a hot reservoir at temperature T₂ and delivers work W to the surroundings

Solution

a heat engine converts heat energy to mechanical work by using the temperature difference between a hot "source" and a cold "sink". Heat is transferred from the source, through the "working body" of the engine, to the "sink", and in this process some of the heat changes into work by using the qualities of the gas or liquid inside the engine.
Question 6
1 / -0

A refrigerator's working substance

A
extracts heat Q₂ from the hot reservoir at temperature T₂, some external work W is done by it and heat Q₁ is released to the cold reservoir at temperature T₁

B
extracts heat Q₂ from the cold reservoir at temperature T₂, some external work W is done on it and heat Q₁ is released to the hot reservoir at temperature T₂

C
extracts heat Q₂ from the hot reservoir at temperature T₂, some external work W is done on it and heat Q₁ is released to the hot reservoir at temperature T₁

D
extracts heat Q₂ from the cold reservoir at temperature T₂, some external work W is done on it and heat Q₁ is released to the hot reservoir at temperature T₁

Solution

According to the second law of thermodynamics heat cannot spontaneously flow from a colder location to a hotter area; work is required to achieve this.
Question 7
1 / -0

The coefficient of performance K of a refrigerator is given by

A
K = Q₂ / W

B
K = W / Q₂

C
K = W+Q₂

D
K = W ∗ Q₂

Solution

The performance of refrigerator is expressed by means of cofficient of performance

cofficient of performance = Heat extracted / work done = Q₂ / W

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Thermodynamics Test - 3

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Thermodynamics Test - 3

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Question 1

R

2R

3R

5R

Solution

Question 2

on the ‘size’ of the system

on the ‘pressure’ of the system

on the ‘temperature’ of the system

on the ‘entropy’ of the system

Solution

Question 3

the temperature of the surrounding reservoir and the external pressure equal the temperature and pressure of the system

the temperature of the surrounding reservoir and the external pressure differ only infinitesimally from the temperature and pressure of the system

the temperature of the surrounding reservoir differ only infinitesimally from the temperature of the system

the temperature of the surrounding reservoir and the external pressure differ substantially from the temperature and pressure of the system

Solution

Question 4

Isobaric process

Isothermal process

Adiabatic process

Isochoric process

Solution

Question 5

heat Q1 from a cold reservoir at temperature T1, releases heat Q2 to a cold reservoir at temperature T2 and delivers work W to the surroundings

heat Q1 from a cold reservoir at temperature T1, releases heat Q2 to a hot reservoir at temperature T2 and delivers work W to the surroundings

heat Q1 from a hot reservoir at temperature T1 , releases heat Q2 to a cold reservoir at temperature T2 and delivers work W to the surroundings

heat Q1 from a hot reservoir at temperature T1, releases heat Q2 to a hot reservoir at temperature T2 and delivers work W to the surroundings

Solution

Question 6

extracts heat Q2 from the hot reservoir at temperature T2, some external work W is done by it and heat Q1 is released to the cold reservoir at temperature T1

extracts heat Q2 from the cold reservoir at temperature T2, some external work W is done on it and heat Q1 is released to the hot reservoir at temperature T2

extracts heat Q2 from the hot reservoir at temperature T2, some external work W is done on it and heat Q1 is released to the hot reservoir at temperature T1

extracts heat Q2 from the cold reservoir at temperature T2, some external work W is done on it and heat Q1 is released to the hot reservoir at temperature T1

Solution

Question 7

K = Q2 / W

K = W / Q2

K = W+Q2

K = W ∗ Q2

Solution

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heat Q₁ from a cold reservoir at temperature T₁, releases heat Q₂ to a cold reservoir at temperature T₂ and delivers work W to the surroundings

heat Q₁ from a cold reservoir at temperature T₁, releases heat Q₂ to a hot reservoir at temperature T₂ and delivers work W to the surroundings

heat Q₁ from a hot reservoir at temperature T₁ , releases heat Q₂ to a cold reservoir at temperature T₂ and delivers work W to the surroundings

heat Q₁ from a hot reservoir at temperature T₁, releases heat Q₂ to a hot reservoir at temperature T₂ and delivers work W to the surroundings

extracts heat Q₂ from the hot reservoir at temperature T₂, some external work W is done by it and heat Q₁ is released to the cold reservoir at temperature T₁

extracts heat Q₂ from the cold reservoir at temperature T₂, some external work W is done on it and heat Q₁ is released to the hot reservoir at temperature T₂

extracts heat Q₂ from the hot reservoir at temperature T₂, some external work W is done on it and heat Q₁ is released to the hot reservoir at temperature T₁

extracts heat Q₂ from the cold reservoir at temperature T₂, some external work W is done on it and heat Q₁ is released to the hot reservoir at temperature T₁

K = Q₂ / W

K = W / Q₂

K = W+Q₂

K = W ∗ Q₂