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

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 # 3

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 # 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

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 # 6

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 # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

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 # 9

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

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Set 2

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Set 3

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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

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 # 3

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 # 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

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 # 6

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 # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

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 # 9

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 # 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 2

Question # 1

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 # 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

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

Ans 1:

Question # 4

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 # 5

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 # 6

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 # 7

What is negative entropy?Give example and its unit.

Ans 1:

Question # 8

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 # 9

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 # 10

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.

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

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

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 # 7

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 # 8

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 # 9

What is negative entropy?Give example and its unit.

Ans 1:

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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Physics

11th Chapter

ICS Part 1 Physics Short Questions Test

Here you can prepare ICS Part 1 Physics English Medium Chapter 11. Click the button for 100% free full practice 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

Define Heat Engine.

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

State second law of thermodynamics in terms of entropy.

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

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

Name the four strokes of the petrol engine.

What is negative entropy?Give example and its unit.

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

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

What is thermodynamic scale of temperature?Give its unit.

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.

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

State second law of thermodynamics in terms of entropy.

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

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

Name the four strokes of the petrol engine.

What is negative entropy?Give example and its unit.

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

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

What is thermodynamic scale of temperature?Give its unit.

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

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

Define absolute zero using the Carnot cycle.

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

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?

Write two limitations of first law of thermodynamics.

What is negative entropy?Give example and its unit.

Name the four strokes of the petrol engine.

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

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

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

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

State Carnot's theorem.

Write kelvin statement of the second law of thermodynamics.

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

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

Write down three example of adiabatic process.

Write two limitations of first law of thermodynamics.

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

What is negative entropy?Give example and its unit.

What is Diesel Engine?

ICS Part 1 Physics Short Questions Test

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