Thermodynamics Test

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Thermodynamics Test - 12

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Question 1
1 / -0

Properties of substances like pressure, temperature and density, in thermodynamic coordinates are

A
path function

B
point function

C
cyclic function

D
real function

Solution

Point Function: They depend on the state only, and not on how a system reaches that state. They are also known as state functions. All properties of a substance are point functions. For example- pressure, temperature and density.
In contrast,
Path function: Their magnitudes depend on the path followed during a process as well as the end states. For example- work done in moving from one point to the other.
Question 2
1 / -0

What describes a spontaneous reaction?

A
Positive $$\Delta H$$

B
Negative $$\Delta H$$

C
Positive $$\Delta G$$

D
Negative $$\Delta G$$

Solution

Option D is the correct answer.
For a reaction to be spontaneous, the value of $$\Delta G$$ should be Negative.
Question 3
1 / -0

The temperature at the bottom of a high water fall is higher than that at the top because

A
by itself heat flows from higher to lower temperature

B
the difference in height causes a difference in pressure

C
thermal energy is transformed into mechanical energy

D
mechanical energy is transformed into thermal energy

Solution

The water at the top of the waterfall, falls and gains velocity.
The potential energy it has converts into kinetic energy.
When the water lands at the bottom, the kinetic energy converts into heat and hence the water is warmer at the bottom.
Question 4
1 / -0

Therm is the unit of

A
heat

B
temperature

C
thermometry

D
work

Solution

Therm is a non SI unit of heat energy equal to ICCF of natural gas and 10000 B+u { British thermal units}.
Hence, OPTION (A) heat.
Question 5
1 / -0

Combustion is

A
exothermic reaction

B
endothermic reaction

C
addition reaction

D
None of these

Solution

$$\textbf{Explanation:}$$
$$\bullet$$Combustion is an oxidation reaction and during this reaction, heat is produced. In this type of reaction, bonds are broken first and then new bonds may be created results in new material formation. So, it is always an exothermic reaction.

$$Answer:$$

Hence, option A is the correct option.
Question 6
1 / -0

Fill in the blank.
Thermodynamics is the branch of science concerned with ____ and ________ and their relation to energy and work.

A
heat, temperature

B
temperature, pressure

C
heat, volume

D
volume, pressure

Solution

Thermodynamics is the branch of physics concerned with heat and temperature and their relation to energy and work. In thermodynamics, we study about the concepts of heat, temperature and relation between heat energy and mechanical energy.
Question 7
1 / -0

Which one of the following is not a thermodynamical co-ordinate?

A
$$V$$

B
$$R$$

C
$$T$$

D
$$P$$

Solution

$$R$$ is a constant term. To define a thermo dynamic state of a gas we use any two of three physical quantities $$P,V$$ and $$T$$. Following ratio is always constant
$$\cfrac{PV}{T}=R$$ (constant)
So, if we change $$P$$ and $$V, T$$ will automatically change itself to make ratio constant.
Question 8
1 / -0

Identify the incorrect statement ?

A
Energy can be converted into matter

B
Matter can be converted into energy

C
Energy can be converted into matter, and matter can be converted into energy

D
Matter can be converted into energy, but energy cannot be converted into matter

E
Energy can be measured in units of joules and calories

Solution

Energy and matter are interconvertible and the relation between them is given by $$E=mc^2$$ as followed from Einstein's theory of Relativity.
The conversion of energy, kinetic or electromagnetic, to particles with rest mass is experimentally observed only when the energy comes in big enough clumps to create a massive particle, when the energy is low, this is going to be the lightest charged particle, the electron. Electrons can only be created along with a positively charged particle, to conserve charge, and this is almost always a positron.
The conversion of mass to energy is nowadays popular in nuclear fission reactors.
Question 9
1 / -0

If there were no atmosphere, the average temperature on earth surface would be

A
lower

B
higher

C
same

D
$${{0}^{o}}C$$

Solution

The correct answer is option(A).
Without atmosphere, earth will turn into a ball of ice. It’s temperature will decrease due to absence of green house gases which trap the sun’s heat and keep the planet warm.
Question 10
1 / -0

Which of the following property is not a thermodynamic property of the system?

A
pressure

B
temperature

C
specific volume

D
heat

Solution

A thermodynamic property is that, which is measurable and whose value describes the state of system. Out of the given quantities, heat doesn't describe the state of a system so it is not a thermodynamic property because a system doesn't contain heat but only can transfer heat.

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Thermodynamics Test - 12

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Thermodynamics Test - 12

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Question 1

path function

point function

cyclic function

real function

Solution

Question 2

Positive $$\Delta H$$

Negative $$\Delta H$$

Positive $$\Delta G$$

Negative $$\Delta G$$

Solution

Question 3

by itself heat flows from higher to lower temperature

the difference in height causes a difference in pressure

thermal energy is transformed into mechanical energy

mechanical energy is transformed into thermal energy

Solution

Question 4

heat

temperature

thermometry

work

Solution

Question 5

exothermic reaction

endothermic reaction

addition reaction

None of these

Solution

Question 6

heat, temperature

temperature, pressure

heat, volume

volume, pressure

Solution

Question 7

$$V$$

$$R$$

$$T$$

$$P$$

Solution

Question 8

Energy can be converted into matter

Matter can be converted into energy

Energy can be converted into matter, and matter can be converted into energy

Matter can be converted into energy, but energy cannot be converted into matter

Energy can be measured in units of joules and calories

Solution

Question 9

lower

higher

same

$${{0}^{o}}C$$

Solution

Question 10

pressure

temperature

specific volume

heat

Solution

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