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

Define Heat Engine.

Ans 1: A device which converts heat energy into mechanical work is called heat engine.

Question # 2

Define absolute zero using the Carnot cycle.

Ans 1: The Carnot cycle provides us the basis to define a temperature scale that is independent of material properties, Absolute zero is the lower limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reaches its minimum value, taken as zero(0). By international agreement, absolute zero is taken as - 273.15°c.

Question # 3

What is adiabatic process?Under what conditions this process occurs?

Ans 1: Adiabatic Process: The process in which no heat enters or leaves the system but the temperature of the system changes.
Adiabatic change occurs when the gas expands or is compressed rapidly,particularly when the gas is contained in an insulated cylinder.

Question # 4

What happens to the temperature of the room, when an air conditioner in left running on a table in the middle of a room ?

Ans 1: No change will be observed because the heat is absorbed and expelled in the same room.Hence there will be no effect on the room's temperature.

Question # 5

Under what circumstances the efficiency of a Carnot engine will be 100%? Is it possible?

Ans 1: No, it is impossible.
The efficiency of a Carnot engines will be 100% only when cold reservoir is at absolute zero temperature (ok).Such reservoirs are not available and hence the maximum efficiency is always less than one or 100%

Question # 6

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 # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

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 # 9

A real heat engine is less efficient than cannot engine. Why?

Ans 1: Carnot engine operates in an ideal reversible cycle and ideal gas is used as the working substance.
No practical heat engine can be perfectly reversible. All real heat engines are less efficient than carnot engine due to friction and other heat losses.

Question # 10

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.

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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

Define Heat Engine.

Ans 1: A device which converts heat energy into mechanical work is called heat engine.

Question # 2

Define absolute zero using the Carnot cycle.

Ans 1: The Carnot cycle provides us the basis to define a temperature scale that is independent of material properties, Absolute zero is the lower limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reaches its minimum value, taken as zero(0). By international agreement, absolute zero is taken as - 273.15°c.

Question # 3

What is adiabatic process?Under what conditions this process occurs?

Ans 1: Adiabatic Process: The process in which no heat enters or leaves the system but the temperature of the system changes.
Adiabatic change occurs when the gas expands or is compressed rapidly,particularly when the gas is contained in an insulated cylinder.

Question # 4

What happens to the temperature of the room, when an air conditioner in left running on a table in the middle of a room ?

Ans 1: No change will be observed because the heat is absorbed and expelled in the same room.Hence there will be no effect on the room's temperature.

Question # 5

Under what circumstances the efficiency of a Carnot engine will be 100%? Is it possible?

Ans 1: No, it is impossible.
The efficiency of a Carnot engines will be 100% only when cold reservoir is at absolute zero temperature (ok).Such reservoirs are not available and hence the maximum efficiency is always less than one or 100%

Question # 6

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 # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

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 # 9

A real heat engine is less efficient than cannot engine. Why?

Ans 1: Carnot engine operates in an ideal reversible cycle and ideal gas is used as the working substance.
No practical heat engine can be perfectly reversible. All real heat engines are less efficient than carnot engine due to friction and other heat losses.

Question # 10

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.

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

Question # 1

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 # 2

Write two limitations of first law of thermodynamics.

Ans 1:
1. 1st law of thermodynamics does not specify the conditions under which conversion of heat into work is possible.
2. It does not specify the direction in which heat transfer takes place (high to low or low to high).
3. The fact that heat cannot be completely converted into work, is a fact that the first law cannot explain.

Question # 3

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 # 4

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 # 5

What happens to the temperature of the room, when an air conditioner in left running on a table in the middle of a room ?

Ans 1: No change will be observed because the heat is absorbed and expelled in the same room.Hence there will be no effect on the room's temperature.

Question # 6

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 # 7

What do you mean by triple point of water?

Ans 1: The triple point of water is a state in which ice, water and vapour coexists in equilibrium and it occurs uniquely at one particular pressure and temperature.Its value is 273.16 k.

Question # 8

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 # 9

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 # 10

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.

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

Question # 1

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 # 2

Why does the pressure of gas in a car tyre increase when it is driven through some distance?

Ans 1: When a car is driven through some distance on the road, its tyres has to overcome frictional force of the road. The work done against the friction heats up the gas in tyre. It increase the velocity and hence the pressure of the air in the tyre.

Question # 3

Write two limitations of first law of thermodynamics.

Ans 1:
1. 1st law of thermodynamics does not specify the conditions under which conversion of heat into work is possible.
2. It does not specify the direction in which heat transfer takes place (high to low or low to high).
3. The fact that heat cannot be completely converted into work, is a fact that the first law cannot explain.

Question # 4

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 # 5

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 # 6

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 # 7

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 # 8

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 # 9

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 # 10

Under what circumstances the efficiency of a Carnot engine will be 100%? Is it possible?

Ans 1: No, it is impossible.
The efficiency of a Carnot engines will be 100% only when cold reservoir is at absolute zero temperature (ok).Such reservoirs are not available and hence the maximum efficiency is always less than one or 100%

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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

Define Heat Engine.

Define absolute zero using the Carnot cycle.

What is adiabatic process?Under what conditions this process occurs?

What happens to the temperature of the room, when an air conditioner in left running on a table in the middle of a room ?

Under what circumstances the efficiency of a Carnot engine will be 100%? Is it possible?

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

What is negative entropy?Give example and its unit.

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

A real heat engine is less efficient than cannot engine. Why?

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

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

Define Heat Engine.

Define absolute zero using the Carnot cycle.

What is adiabatic process?Under what conditions this process occurs?

What happens to the temperature of the room, when an air conditioner in left running on a table in the middle of a room ?

Under what circumstances the efficiency of a Carnot engine will be 100%? Is it possible?

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

What is negative entropy?Give example and its unit.

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

A real heat engine is less efficient than cannot engine. Why?

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

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

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

Write two limitations of first law of thermodynamics.

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

Write down three example of adiabatic process.

What happens to the temperature of the room, when an air conditioner in left running on a table in the middle of a room ?

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

What do you mean by triple point of water?

Define pressure of a gas.

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

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

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

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

Why does the pressure of gas in a car tyre increase when it is driven through some distance?

Write two limitations of first law of thermodynamics.

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

State Carnot's theorem.

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

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

What is Diesel Engine?

Write kelvin statement of the second law of thermodynamics.

Under what circumstances the efficiency of a Carnot engine will be 100%? Is it possible?

ICS Part 1 Physics Short Questions Test

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