Thermodynamics Test

Result

Thermodynamics Test - 10

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The Zeroth law leads to the concept of

A
temprature

B
heat

C
internal energy

D
work

Solution

Zeroth law states that if two thermodynamic systems are each in thermal equilibrium with a third one, then they are in thermal equilibrium with each other. Thus as it deals with thermal equilibrium it is very clear that it is a concept of temperature.
Question 2
1 / -0

Suppose we have a box filled with gas and a piston is also attached at the top of the box.What are the ways of changing the state of gas (and hence its internal energy)?

A
Bring box in contact with a body with higher temperature

B
Move the box so that it has kinetic energy

C
Pushing the piston down so as to do work on the system

D
both a and c

Solution

As change of state depends on both temperature and pressure, so, either method A or C can be used. We can understand this by ideal gas equation PV = nRT
Question 3
1 / -0

Which of the following statement is true for a thermodynamical system where ∆U is the increase in internal energy and ∆W work done respectively?

A
∆U = ∆W in isothermal process

B
∆U = ∆W in a adiabatic process

C
∆U= -∆W in case of ideal gas

D
∆U= -∆W in an adiabatic process

Solution

∆ U = ∆ Q - ∆ W
In an adiabatic process ∆Q is zero, therefore
∆ U = - ∆ W
Question 4
1 / -0

Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?

A
Temperature of the system rises

B
Internal energy of the coffee increased

C
Heat energy has been added to coffee

D
Work is done on the system

Solution

No, heat is not transferred as the flask is insulated from the surroundings ∴dQ=0
Question 5
1 / -0

The internal energy and the work done by a system decreases by same amount then

A
The temperature must decrease

B
The process must be adiabatic

C
The process must be isothermal

D
both a and b

Solution

The internal energy of a system decreases by the same amount as the work done by the system.

Change in internal energy=work done+heat exchange
change in internal energy=work done if process has no heat exchange, i.e. it's adiabatic and the temperature must decrease
Question 6
1 / -0

Which wall would allow the flow of thermal energy between systems A and B to achieve thermal equilibrium?

A
Diathermic wall

B
Adiabatic wall

C
Diadiabatic wall

D
Thermal wall

Solution

Wall that permits *heat" to flow through them,such as engine block is called diathermic wall.
wall Perfectly insulating ball that doesn't allow the flow heat to them are called adiabatic walls.
Question 7
1 / -0

The first law of thermodynamics
1. Is a restatement of the principle of conservation of energy as applied to heat energy
2. Is the basis for the definition of internal energy
3. Is basis for the definition of temperature
4. asserts the impossibility of achieving an absolute zero temperature.

A
1 and 2

B
only 1

C
1 and 3

D
1,2 and 4

Solution

The change is internal energy if the system is equal to the difference between the heat added to the system and work done by the system.
Question 8
1 / -0

The First Law of Thermodynamics states that:

A
ΔQ - W = ΔU

B
ΔQ - ΔW = U

C
ΔQ - ΔU = ΔW

D
Q - W = U

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 can neither be created nor destroyed.
According to this law, some of the heat given to system is used to change the internal energy while the rest in doing work by the system. Mathematically,
ΔQ=ΔU+ΔW
where,
ΔQ = Heat supplied to the system
ΔW= Work done by the system.
ΔU = Change in the internal energy of the system.
If Q is positive, then there is a net heat transfer into the system, if W is positive, then there is work done by the system. So positive Q adds energy to the system and positive W takes energy from the system.
It can also be represented as ΔU=ΔQ-ΔW
We can say that internal energy tends to increase when heat is given to the system and vice versa.
Question 9
1 / -0

Internal energy of a system increases by 60 J when 140 Jof heat is added to the gaseous system. The amount of work done would be:

A
80 J

B
100 J

C
200 J

D
140 J

Solution

We know that dq = dU + dW
And as dU = 60 and dq = 140J
We get dW = 140 - 60 = 80J
Question 10
1 / -0

First law of thermodynamics tells us:

A
the nature of the process taking place

B
the direction in which a given process can take place

C
to what extent the process takes place

D
that heat supplied is used to carry out the process

Solution

First law of thermodynamics is based on law of conservation of energy i.e. energy supplied to a system has to be used in raising the internal energy of the system. So heat supplied is used to carry out the process.
∆U = Q + W.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Thermodynamics Test - 10

Result

Thermodynamics Test - 10

Score

-

Rank

-

SHARING IS CARING

Question 1

temprature

heat

internal energy

work

Solution

Question 2

Bring box in contact with a body with higher temperature

Move the box so that it has kinetic energy

Pushing the piston down so as to do work on the system

both a and c

Solution

Question 3

∆U = ∆W in isothermal process

∆U = ∆W in a adiabatic process

∆U= -∆W in case of ideal gas

∆U= -∆W in an adiabatic process

Solution

Question 4

Temperature of the system rises

Internal energy of the coffee increased

Heat energy has been added to coffee

Work is done on the system

Solution

Question 5

The temperature must decrease

The process must be adiabatic

The process must be isothermal

both a and b

Solution

Question 6

Diathermic wall

Adiabatic wall

Diadiabatic wall

Thermal wall

Solution

Question 7

1 and 2

only 1

1 and 3

1,2 and 4

Solution

Question 8

ΔQ - W = ΔU

ΔQ - ΔW = U

ΔQ - ΔU = ΔW

Q - W = U

Solution

Question 9

80 J

100 J

200 J

140 J

Solution

Question 10

the nature of the process taking place

the direction in which a given process can take place

to what extent the process takes place

that heat supplied is used to carry out the process

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.