ICS Part 1 Physics English Medium Chapter 11 Online Short Questions Test with Answers

Online Short Questions For Chapter 11 "ICS Part 1 Physics Chapter 11 Short Questions Test "

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Physics - ICS Part 1 Physics Chapter 11 Short Questions Test

Question # 1

Write kelvin statement of the second law of thermodynamics.

Ans 1: It is impossible to devise a process which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system.

Question # 2

Is it possible to construct a heat engine that will not expel heat into the atmosphere?

Ans 1: No, it is not possible to construct a heat engine that will not expel heat into the atmosphere. It is against 2nd law of thermodynamics. A heat engine works only when some of the total heat absorbed from the source is expelled to a sink or atmosphere.

Question # 3

Why we reduce pressure in the tyre while moving on motorway?

Ans 1: We reduce the pressure in the tyre while moving on motorway because when a car is driven through some distance,its tyres become hot due to work done against friction between the tyres and the road which appears as heat. This heat is absorbed by the gas molecules contained in the tyre which results in an increase in pressure of the gas. If the pressure in the tyre is not reduced then the tyre may burst.

Question # 4

Why absolute value of internal energy cannot be measured?

Ans 1: By experiment it has been seen that the change in internal energy is independent of paths and it only depends upon change from initial to final state of the system. It is a function of state.
Internal energy is similar to the gravitational P.E.So like the potential energy, it is the change in internal energy and not its absolute value, which is important.

Question # 5

Define the term internal energy . Discuss in what form it is in an ideal gas.

Ans 1: The sum of all forms of molecular energies such as kinetic and potential energy of a substance is called its internal energy.
Internal energy of an ideal gas system is generally the translational kinetic energy of gas molecules.

Question # 6

What is difference between isothermal and adiabatic process?

Ans 1: Isothermal process: The process in which temperature of the system remains constant is called isothermal process.
T= constant
Adiabatic System: The process in which no heat enters or leaves the system is called adiabatic system.

Question # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

Write down three example of adiabatic process.

Ans 1: Three example of adiabatic process are
- Cloud formation in the atmosphere
- The rapid escape or air from a burst tyre.
- The rapid expansion or compression of a gas through which sound wave is passing.

Question # 9

State Carnot's theorem.

Ans 1: It states that no heat engine can be more efficient than a carnot engine operating between the same two temperatures.

Question # 10

Write the four postulates of kinetic theory of gases.

Ans 1:
1. A finite volume of gas consists of consists of very large number of molecules.
2. The size of molecules is much smaller than the separation between them.
3. The molecules do not exert force on each other except durings a collision
4. The collision between gas molecules themselves and with the walls of container is assumed to be perfectly elastic.

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Prepare Complete Set Wise Questions For Chapter 11 "ICS Part 1 Physics Chapter 11 Short Questions Test "

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ICS Part 1 Physics Chapter 11 Short Questions Test - Set 1

Question # 1

Write kelvin statement of the second law of thermodynamics.

Ans 1: It is impossible to devise a process which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system.

Question # 2

Is it possible to construct a heat engine that will not expel heat into the atmosphere?

Ans 1: No, it is not possible to construct a heat engine that will not expel heat into the atmosphere. It is against 2nd law of thermodynamics. A heat engine works only when some of the total heat absorbed from the source is expelled to a sink or atmosphere.

Question # 3

Why we reduce pressure in the tyre while moving on motorway?

Ans 1: We reduce the pressure in the tyre while moving on motorway because when a car is driven through some distance,its tyres become hot due to work done against friction between the tyres and the road which appears as heat. This heat is absorbed by the gas molecules contained in the tyre which results in an increase in pressure of the gas. If the pressure in the tyre is not reduced then the tyre may burst.

Question # 4

Why absolute value of internal energy cannot be measured?

Ans 1: By experiment it has been seen that the change in internal energy is independent of paths and it only depends upon change from initial to final state of the system. It is a function of state.
Internal energy is similar to the gravitational P.E.So like the potential energy, it is the change in internal energy and not its absolute value, which is important.

Question # 5

Define the term internal energy . Discuss in what form it is in an ideal gas.

Ans 1: The sum of all forms of molecular energies such as kinetic and potential energy of a substance is called its internal energy.
Internal energy of an ideal gas system is generally the translational kinetic energy of gas molecules.

Question # 6

What is difference between isothermal and adiabatic process?

Ans 1: Isothermal process: The process in which temperature of the system remains constant is called isothermal process.
T= constant
Adiabatic System: The process in which no heat enters or leaves the system is called adiabatic system.

Question # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

Write down three example of adiabatic process.

Ans 1: Three example of adiabatic process are
- Cloud formation in the atmosphere
- The rapid escape or air from a burst tyre.
- The rapid expansion or compression of a gas through which sound wave is passing.

Question # 9

State Carnot's theorem.

Ans 1: It states that no heat engine can be more efficient than a carnot engine operating between the same two temperatures.

Question # 10

Write the four postulates of kinetic theory of gases.

Ans 1:
1. A finite volume of gas consists of consists of very large number of molecules.
2. The size of molecules is much smaller than the separation between them.
3. The molecules do not exert force on each other except durings a collision
4. The collision between gas molecules themselves and with the walls of container is assumed to be perfectly elastic.

Submit

ICS Part 1 Physics Chapter 11 Short Questions Test - Set 2

Question # 1

Specific heat of a gas at constant pressure is greater than specific heat at constant volume why?

Ans 1: At constant volume, no work is done and the entire heat is utilized in raising the internal energy of the system.But under constant pressure, heat is not only required to raise the internal energy but also to do work against constant pressure.
Hence specific heat of a gas at constant pressure is greater than specific heat at constant volume.

Question # 2

Why we reduce pressure in the tyre while moving on motorway?

Ans 1: We reduce the pressure in the tyre while moving on motorway because when a car is driven through some distance,its tyres become hot due to work done against friction between the tyres and the road which appears as heat. This heat is absorbed by the gas molecules contained in the tyre which results in an increase in pressure of the gas. If the pressure in the tyre is not reduced then the tyre may burst.

Question # 3

No spark plug is used in Diesel Engine.How it gets ignition?

Ans 1: Diesel is sprayed into the cylinder at maximum compression. Because air is at very high temperature immediately after compression, the fuel mixture ignites on contact with the air on the cylinder.

Question # 4

Define the term internal energy . Discuss in what form it is in an ideal gas.

Ans 1: The sum of all forms of molecular energies such as kinetic and potential energy of a substance is called its internal energy.
Internal energy of an ideal gas system is generally the translational kinetic energy of gas molecules.

Question # 5

What is Diesel Engine?

Ans 1: No spark plug is needed in diesel engine. Diesel is sprayed into cylinder at maximum compression. Because air is at high temperature after compression,fuel mixture ignites on contact with air is at high temperature after compression,fuel mixture ignites on contact with air in cylinder and pushes the piston outward.
Its efficiency is about 35% to 40%.

Question # 6

Give an example of a process in which no heat is transferred to or from the system but the temperature of the system changes.

Ans 1: An adiabatic process is the process in which no heat is transferred to or from the system but the temperature of the system and velocities of molecules changes.
In an adiabatic expansion of a gas, the temperature decreases as the work is done in expanding the gas at the cost of its internal energy.

Question # 7

What is an Adiabatic process? Also give its two examples.

Ans 1: Adiabatic Process:An adiabatic process is the process in which no heat is transferred to or from the system but the temperature of the system changes.
Examples: Passage of sound through the air, rapid escape of air from a burst tyre and cloud formation etc.

Question # 8

We talk about molar specific heat of gases but not talk about molar specific heat of solids and liquids. Why?

Ans 1: In case of solids and liquids the change in volume and hence work done against external pressure during a change of temperature is negligibly small.But same can not be said about gases which suffer variation in pressure as well as in volume with the rise in temperature.

Question # 9

Define reversible and irreversible process.Give one example of each.

Ans 1: Reversible Process: A Process which can be retracted in exactly reverse order without producing any change in the surroundings is called reversible process.For example, melting of ice into water and freezing of water into ice.
Irreversible Processes: A process which cannot be retracted in the backward direction by reversing the controlling factors is called an irreversible process.
For example, work done against friction.

Question # 10

What is thermodynamic scale of temperature?Give its unit.

Ans 1: The thermodynamic scale of temperature is defined by choosing 273.16k as the absolute temperature of the triple point of water as one fixed point and absolute zero as the other.
The unit of thermodynamic scale is kelvin.

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ICS Part 1 Physics Chapter 11 Short Questions Test - Set 3

Question # 1

What is negative entropy?Give example and its unit.

Ans 1:

Question # 2

Give an example of a natural process that involves an increase in entropy .

Ans 1:

Question # 3

Specific heat of a gas at constant pressure is greater than specific heat at constant volume why?

Ans 1: At constant volume, no work is done and the entire heat is utilized in raising the internal energy of the system.But under constant pressure, heat is not only required to raise the internal energy but also to do work against constant pressure.
Hence specific heat of a gas at constant pressure is greater than specific heat at constant volume.

Question # 4

What is the similarity and difference between internal energy and gravitational P.E?

Ans 1: Internal energy is similar to the gravitational P.E.So like the potential energy, it is the change in internal energy and not its absolute value, which is important.
Internal energy depends upon temperature of the system while gravitational P.E depends on position of the particle.

Question # 5

What is Diesel Engine?

Ans 1: No spark plug is needed in diesel engine. Diesel is sprayed into cylinder at maximum compression. Because air is at high temperature after compression,fuel mixture ignites on contact with air is at high temperature after compression,fuel mixture ignites on contact with air in cylinder and pushes the piston outward.
Its efficiency is about 35% to 40%.

Question # 6

Define reversible and irreversible process.Give one example of each.

Ans 1: Reversible Process: A Process which can be retracted in exactly reverse order without producing any change in the surroundings is called reversible process.For example, melting of ice into water and freezing of water into ice.
Irreversible Processes: A process which cannot be retracted in the backward direction by reversing the controlling factors is called an irreversible process.
For example, work done against friction.

Question # 7

Define pressure of a gas.

Ans 1: The pressure exerted by a gas is the momentum transferred to the walls of the container per sec unit area due to continuous collision of molecules of gas.

Question # 8

State second law of thermodynamics in terms of entropy.

Ans 1: It states that if a system undergoes a natural process, it will go in the direction that causes the entropy of the system plus the environment to increase.

Question # 9

What would be the heat lost if internal energy decreased by 10j and 20j of work is done on the system simultaneously

Ans 1:

Question # 10

What is thermodynamic scale of temperature?Give its unit.

Ans 1: The thermodynamic scale of temperature is defined by choosing 273.16k as the absolute temperature of the triple point of water as one fixed point and absolute zero as the other.
The unit of thermodynamic scale is kelvin.

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ICS Part 1 Physics Short Questions Test

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ICS Part 1 Physics English Medium Chapter 11 Online Short Questions Test with Answers

Online Short Questions For Chapter 11 "ICS Part 1 Physics Chapter 11 Short Questions Test "

Physics - ICS Part 1 Physics Chapter 11 Short Questions Test

Write kelvin statement of the second law of thermodynamics.

Is it possible to construct a heat engine that will not expel heat into the atmosphere?

Why we reduce pressure in the tyre while moving on motorway?

Why absolute value of internal energy cannot be measured?

Define the term internal energy . Discuss in what form it is in an ideal gas.

What is difference between isothermal and adiabatic process?

What is negative entropy?Give example and its unit.

Write down three example of adiabatic process.

State Carnot's theorem.

Write the four postulates of kinetic theory of gases.

Prepare Complete Set Wise Questions For Chapter 11 "ICS Part 1 Physics Chapter 11 Short Questions Test "

Set 1

Set 2

Set 3

ICS Part 1 Physics Chapter 11 Short Questions Test - Set 1

Write kelvin statement of the second law of thermodynamics.

Is it possible to construct a heat engine that will not expel heat into the atmosphere?

Why we reduce pressure in the tyre while moving on motorway?

Why absolute value of internal energy cannot be measured?

Define the term internal energy . Discuss in what form it is in an ideal gas.

What is difference between isothermal and adiabatic process?

What is negative entropy?Give example and its unit.

Write down three example of adiabatic process.

State Carnot's theorem.

Write the four postulates of kinetic theory of gases.

ICS Part 1 Physics Chapter 11 Short Questions Test - Set 2

Specific heat of a gas at constant pressure is greater than specific heat at constant volume why?

Why we reduce pressure in the tyre while moving on motorway?

No spark plug is used in Diesel Engine.How it gets ignition?

Define the term internal energy . Discuss in what form it is in an ideal gas.

What is Diesel Engine?

Give an example of a process in which no heat is transferred to or from the system but the temperature of the system changes.

What is an Adiabatic process? Also give its two examples.

We talk about molar specific heat of gases but not talk about molar specific heat of solids and liquids. Why?

Define reversible and irreversible process.Give one example of each.

What is thermodynamic scale of temperature?Give its unit.

ICS Part 1 Physics Chapter 11 Short Questions Test - Set 3

What is negative entropy?Give example and its unit.

Give an example of a natural process that involves an increase in entropy .

Specific heat of a gas at constant pressure is greater than specific heat at constant volume why?

What is the similarity and difference between internal energy and gravitational P.E?

What is Diesel Engine?

Define reversible and irreversible process.Give one example of each.

Define pressure of a gas.

State second law of thermodynamics in terms of entropy.

What would be the heat lost if internal energy decreased by 10j and 20j of work is done on the system simultaneously

What is thermodynamic scale of temperature?Give its unit.

ICS Part 1 Physics Short Questions Test

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