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

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.

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

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 # 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

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 # 6

What is negative entropy?Give example and its unit.

Ans 1:

Question # 7

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 # 8

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 # 9

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 # 10

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%.

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

Set 1

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Set 2

10 Questions
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Set 3

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

Question # 1

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.

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

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 # 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

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 # 6

What is negative entropy?Give example and its unit.

Ans 1:

Question # 7

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 # 8

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 # 9

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 # 10

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%.

Submit

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

Question # 1

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

Ans 1:

Question # 2

Name the four strokes of the petrol engine.

Ans 1: Four strokes of the petrol engine are
- Intake stroke
- Compression stroke
- Power stroke
- Exhaust stroke

Question # 3

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 # 4

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.

Question # 5

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 # 6

What is negative entropy?Give example and its unit.

Ans 1:

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

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 # 9

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 # 10

Does entropy of a system increase or decrease due to friction?

Ans 1: The entropy of a system increase due to the friction as work done against friction is changed into heat and heat added to the system increase its entropy.

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

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

Does entropy of a system increase or decrease due to friction?

Ans 1: The entropy of a system increase due to the friction as work done against friction is changed into heat and heat added to the system increase its entropy.

Question # 3

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.

Question # 4

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 # 5

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 # 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

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 # 8

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 # 9

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 # 10

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.

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11th Chapter

ICS Part 1 Physics Short Questions Test

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Chapter 11

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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

What is thermodynamic scale of temperature?Give its unit.

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

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

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

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

What is negative entropy?Give example and its unit.

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

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

Define absolute zero using the Carnot cycle.

What is Diesel Engine?

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

What is thermodynamic scale of temperature?Give its unit.

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

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

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

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

What is negative entropy?Give example and its unit.

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

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

Define absolute zero using the Carnot cycle.

What is Diesel Engine?

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

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

Name the four strokes of the petrol engine.

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

Write the four postulates of kinetic theory of gases.

Define pressure of a gas.

What is negative entropy?Give example and its unit.

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

Write kelvin statement of the second law of thermodynamics.

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

Does entropy of a system increase or decrease due to friction?

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

Write kelvin statement of the second law of thermodynamics.

Does entropy of a system increase or decrease due to friction?

What is thermodynamic scale of temperature?Give its unit.

What do you mean by triple point of water?

State second law of thermodynamics in terms of entropy.

What is difference between isothermal and adiabatic process?

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

Write two limitations of first law of thermodynamics.

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

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

ICS Part 1 Physics Short Questions Test

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