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

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

Ans 1:

Question # 2

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 # 3

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 # 4

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 # 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

Define entropy,how it changes with temperature.

Ans 1:

Question # 7

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 # 8

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 # 9

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 # 10

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

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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

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

Ans 1:

Question # 2

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 # 3

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 # 4

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 # 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

Define entropy,how it changes with temperature.

Ans 1:

Question # 7

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 # 8

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 # 9

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 # 10

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

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

Question # 1

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 # 2

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 # 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

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 # 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

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 # 7

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 # 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

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 # 10

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.

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

Question # 1

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 # 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

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

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

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 # 6

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 # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

Define entropy,how it changes with temperature.

Ans 1:

Question # 9

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 # 10

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.

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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

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?

Write down three example of adiabatic process.

What is Diesel Engine?

Define pressure of a gas.

Define entropy,how it changes with temperature.

What is difference between isothermal and adiabatic process?

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

Why absolute value of internal energy cannot be measured?

Name the four strokes of the petrol 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

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?

Write down three example of adiabatic process.

What is Diesel Engine?

Define pressure of a gas.

Define entropy,how it changes with temperature.

What is difference between isothermal and adiabatic process?

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

Why absolute value of internal energy cannot be measured?

Name the four strokes of the petrol engine.

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

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

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

What is thermodynamic scale of temperature?Give its unit.

State second law of thermodynamics in terms of entropy.

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

State Carnot's theorem.

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

Write down three example of adiabatic process.

Write the four postulates of kinetic theory of gases.

What is difference between isothermal and adiabatic process?

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

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

Name the four strokes of the petrol engine.

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

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

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

Why absolute value of internal energy cannot be measured?

What is negative entropy?Give example and its unit.

Define entropy,how it changes with temperature.

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

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

ICS Part 1 Physics Short Questions Test

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