Thermodynamics Test

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Thermodynamics Test - 24

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Question 1
1 / -0

Body A is in contact with body B, which is in contact with body C. The temperature of A is more than B which is more than C. Which of the following is the correct direction of flow in accordance with the zeroth law of thermodynamics.

A
A to B to C

B
A to B and C to B

C
C to B to A

D
B to A and B to C

Solution

$$Answer:-$$ A
Body having higher temperature will have higher heat and will transfer heat to low temperature bodies if it comes into contact with them. So, in this heat will flow from A to B to C and finally attain same temperature.
Question 2
1 / -0

The temperature of A, B and C in the figure are in the order, $$T_B>T_A>T_C$$. Which of the diagrams show the correct direction of heat flow.

A

B

C

D

Solution

$$Answer:-$$ B
Since B is at highest temperature so for the system to come into equilibrium heat will flow from B to A and also from B to C and finally after some time whole system will have same temperature.
Question 3
1 / -0

Two bodies at different temperatures are kept in contact. If the body at higher temperature gets hotter than it violates which law of thermodynamics?

A
Zeroth law of thermodynamics

B
First law of thermodynamics

C
Second law of thermodynamics

D
Third law of thermodynamics

Solution

$$Answer:-$$ A
The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.
So, two bodies in contact will always attain same temperature after some time.
Question 4
1 / -0

Thermometer construction is based on the principle of:

A
Zeroth Law of Thermodynamics

B
First Law of Thermodynamics

C
Second Law of Thermodynamics

D
Third Law of Thermodynamics

Solution

$$Answer:-$$ A
The zeroth law of thermodynamics justifies the use of suitable thermodynamic systems as thermometers to provide such a labeling, which yield any number of possible emprical temperature scales, and justifies the use of the second law of thermodynamics to provide an absolute, or thermodynamic temperature scale. Such temperature scales bring additional continuity and ordering (i.e., "hot" and "cold") properties to the concept of temperature.
Question 5
1 / -0

An extensive property is

A
a property that changes when the size of the sample changes.

B
a property that doesn't change when you take away some of the sample.

C
both

D
none

Solution

$$Answer:-$$ A
An intensive property is a bulk property, meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system. Examples of intensive properties include temperature(T), refractive index (n), density, and hardness of an object. When a diamond is cut, the pieces maintain their intrinsic hardness (until their size reaches a few atoms thick), so hardness is independent of the size of the system.
By contrast, an extensive property is additive for subsystems. This means the system could be divided into any number of subsystems, and the extensive property measured for each subsystem; the value of the property for the system would be the sum of the property for each subsystem. For example, both the mass, and the volume, of a diamond are directly proportional to the amount that is left after cutting it from the raw mineral. Mass and volume are extensive properties, but hardness is intensive.
In other words An extensive property is a property that changes when the size of the sample changes. Examples are mass, volume, length, and total charge.
Question 6
1 / -0

For two bodies (which are in contact with each other) to be in thermal equilibrium, they must be separated by :

A
an insulating wall

B
a conducting wall

C
both A and B

D
none of the above

Solution

$$Answer:-$$ B
Two systems are said to be in the relation of thermal equilibrium if they are linked by a wall permeable only to heat(conducting wall) and they do not change over time. As a convenience of language, systems are sometimes also said to be in a relation of thermal equilibrium if they are not linked so as to be able to transfer heat to each other, but would not do so if they were connected by a wall permeable only to heat.
Question 7
1 / -0

Which of the following is an example of a closed system?

A
a cup of tea

B
an air-tight container

C
a jug of water

D
all of the above

Solution

$$Answer:-$$ B
In thermodynamics, a closed system can exchange energy (as heat or work) but not matter, with its surroundings. An isolated system cannot exchange any heat, work, or matter with the surroundings, while an open system can exchange energy and matter.
In air tight container exchange of matter is not possible only energy can be transferred so it is closed system.
but cup of tea and jug of water are open system.
Question 8
1 / -0

"Two systems in thermal equilibrium with a third system are in thermal equilibrium with each other" is the statement of:

A
Zeroth Law of Thermodynamics

B
First Law of Thermodynamics

C
Second Law of Thermodynamics

D
Third Law of Thermodynamics

Solution

$$Answer:-$$ A
The zeroth law of thermodynamics states that if two thermodynamic system are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.
Question 9
1 / -0

If specific heat of $$1$$g of coal is s then specific heat of $$10$$g of coal is _____________.

A
2s

B
10s

C
s

D
None of these

Solution

If specific heat of 1g of coal is s then specific heat of 10g of coal is s only, as specific heat does not depend on mass of the substance.
Question 10
1 / -0

Specific heat of a substance depends on its.

A
Mass

B
Volume

C
Temperature

D
Colour

Solution

the specific heat capacity (or simply, the specific heat), which is the heat capacity per unit mass of a material. Experiments show that the transferred heat depends on three factors: (1) The change in temperature, (2) the mass of the system, and (3) the substance and phase of the substance.

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Thermodynamics Test - 24

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Thermodynamics Test - 24

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Question 1

A to B to C

A to B and C to B

C to B to A

B to A and B to C

Solution

Question 2

Solution

Question 3

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Solution

Question 4

Zeroth Law of Thermodynamics

First Law of Thermodynamics

Second Law of Thermodynamics

Third Law of Thermodynamics

Solution

Question 5

a property that changes when the size of the sample changes.

a property that doesn't change when you take away some of the sample.

both

none

Solution

Question 6

an insulating wall

a conducting wall

both A and B

none of the above

Solution

Question 7

a cup of tea

an air-tight container

a jug of water

all of the above

Solution

Question 8

Zeroth Law of Thermodynamics

First Law of Thermodynamics

Second Law of Thermodynamics

Third Law of Thermodynamics

Solution

Question 9

2s

10s

s

None of these

Solution

Question 10

Mass

Volume

Temperature

Colour

Solution

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