11th Physics Focus Guide PDF Free Download 2024

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11th Physics Focus Guide Objective for Students

Two convex lenses with power 2 D are kept in contact with each other. The focal length of the combined lens system is

The splitting of different colors of light in a prism is

The number of colors contained in the sunlight is

The optical phenomenon that is primarily responsible for the observation of a rainbow on a rainy day is

Which of these travels in glass with minimum velocity?

What is the color of the light emitted by the Sun?

When a beam of white light passes through a glass prism, the color of the light beam that deviates the least is

When a beam of white light is allowed to fall on a prism, the maximum deviation of the emerging light occurs for

A simple harmonic oscillator has a displacement of 0.02 m and acceleration equal to 2.0 m/s² at any time the frequency of oscillation will be :

The maximum speed of the particle executing SHM is 1 m/s and the maximum acceleration is 1.57 m/s². Then the period is :

If the earth is a homogenous sphere and a straight hole is bored in it through its center. A body is dropped into the hole then the body performs SHM with period :

A particle of mass 1 kg is moving in an S.H.M. with an amplitude of 0.02 m and a frequency of 60 Hz. The maximum force acting on the particle is :

A particle performing linear SHM has a velocity of 10 cm/s when it passes through the mean position, if the amplitude of SHM is 2 cm, its velocity at the midpoint between the mean and extreme position :

In a gasoline engine, the motion of the piston is SHM. The piston has a mass of 2 kg and a stroke of 10 cm. Find the maximum force on the piston if it makes 50 vibrations per minute :

If a Carnot engine is working between the steam point and the ice point, then its efficiency will be

A Carnot engine absorbs 750 J of heat energy from a reservoir at 137 °C and rejects 500 J of heat during each cycle, then the temperature of the sink is

A Carnot engine whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be

A refrigerator is to maintain eatables kept inside at 7 °C. The coefficient of performance of a refrigerator if the room temperature is 38 °C is

If the coefficient of performance of a refrigerator is 5 and operates at the room temperature of 27 °C, the temperature inside the refrigerator is

A Carnot's cycle operating between T₁=600 K and T₂ = 300 K produces 1.5 kJ of mechanical work per cycle. The heat transferred to the engine by the reservoirs is

Consider a Carnot cycle operating between source 750 K and sink temperature 350 K producing 1.25 kJ of mechanical work per cycle, the heat transferred to the engine by the reservoirs

Two moles of an ideal monoatomic gas occupy a volume of 2V at a temperature of 300 K, it expands to a volume of 4V adiabatically, then the final temperature of the gas is

An engine has an efficiency of 0.25 when the temperature of the sink is reduced by 58 °C, if its efficiency is doubled, then the temperature of the source is

The temperature of a refrigerator is kept at 7 °C to keep the food articles kept in it in good condition. What is its coefficient of performance, if the room temperature is 37 °C?

A household refrigerator has a coefficient of performance of 6. If the room temperature outside the refrigerator is 30 °C, what is the lowest temperature that can be obtained inside the refrigerator?

The coefficient of performance of a refrigerator working between -3 °C and 27 °C is :

A refrigerator whose coefficient of performance is 5 extracts heat from the cooling compartment at the rate of 250 J per cycle. The work required per cycle to operate the refrigerator is :

A refrigerator, with its power 'ON', is kept in a closed room with its door open. The temperature of the room will :

A refrigerator is a :

In an ideal refrigerator, heat from inside at 280 K is transferred to a room at 300 K. What is the amount of heat (in joule) which will be transferred to the room for each joule of electrical energy consumed in the process?

A refrigerator absorbs 2000 cal of heat from ice trays. If the coefficient of performance is 4, then the work done by the motor is :

The coefficient of performance of a refrigerator working between 10 °C and 20 °C is :

Refrigerator A works between -10 °C and 27 °C while refrigerator B works between -27 °C and 17 °C both removing heats equal to 2000 J from the freezer. Which of the two is the better refrigerator?

The efficiency of a heat engine is 50% and the temperature of the sink is 500 K. If the temperature of the source is kept constant and its efficiency is to be raised to 60%, then the required temperature of the sink should be :

An engine has an efficiency of 1/6. When the temperature of the sink is reduced by 62 °C, its efficiency is doubled. What is the temperature of the source?

A refrigerator acts as

If the door of a refrigerator is kept open, then which of the following is true?

The temperatures of the source and the sink of a heat engine are 127 °C and 27 °C respectively. An inventor claims its efficiency to be 30%, then :

A heat engine absorbs 1000 J of heat from a hot reservoir at 127 °C and rejects 600 J of heat during each cycle. The efficiency of the engine is :

An ideal heat engine exhausting heat at 27 °C is to have 25 % efficiency. It must take the heat at :

An automobile engine absorbs 1600 J from a source and expels 1000 J to a sink in each cycle. The maximum work done in each cycle is :

An engine takes compressed steam at 127 °C and rejects it at 47 °C. The efficiency of the engine is :

A scientist says that if the efficiency of his heat engine which operates at a source temperature of 127 °C and sink temperature of 27 °C is 26%, then :

A heat engine has an efficiency of 1/3. The amount of work this heat engine can perform per kcal of heat input is :

What is the value of sink temperature when the efficiency of the heat engine is 100 %?

The specific heat of a gas in an isothermal process is :

Work done in an adiabatic change in a gas depends only on :

1 gram of an ideal gas expands isothermally, heat flow will be :

The slope of an adiabatic curve is always :

A sample of gas expands from volume V₁ to V₂ The amount of work done by the gas is greatest when the expansion is :

A diatomic gas initially at 18°C has compressed adiabatically to 1/8 th of its original volume. The temperature after compression will be :

In the isothermal expansion, the pressure is determined by :

In an isothermal process : ( 11th physics focus guide )

A gas does 4.5 J of external work during adiabatic expansion. Its temperature falls by 2 K. Its internal energy will :

An ideal gas is enclosed in a cylinder-piston arrangement and undergoes adiabatic compression. The work done on the gas is 4 J. Which of the following statement is correct? :

Heat given to a system is 35 J and work done by the system is 15 J. The change in the internal energy of the system will be :

A thermodynamical system absorbs 100 cal of heat and performs 30 J of work. If J = 4.2 J/cal, the change in its internal energy will be :

When the amount of work done is 333 cal and the change in internal energy is 167 cal, then the heat supplied is.

In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas released 20 J of heat and 8 J of work was done on the gas. If the initial internal energy of the gas was 30 J, then the final internal energy will be :

During the adiabatic expansion of 2 moles of a gas, the change in the internal energy was found to be - 100 J. The work done during the process was :

During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2J. The work done during the process by gas will be equal to :

In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out 30 J of heat, and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be :

A gas receives an amount of heat equal to 210 J and performs 140 J of work. The change in the internal energy of the gas is :

One mole of an ideal gas requires 207 J to raise the temperature by 10 K when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by the same 10K, the heat required is (Given: Universal gas constant R= 8.3 J/mol K) :

Which of the following cannot determine the state of a thermodynamic system?:

11th Physics Focus Guide Objective for Students

11th Physics Focus Guide Objective PDF Free Download

Two convex lenses with power 2 D are kept in contact with each other. The focal length of the combined lens system is

(a) 0.10 m

(b) 2 m

(d) 0.25 m

Option d - 0.25 m

The splitting of different colors of light in a prism is

(a) Reflection of light

(b) Dispersion of light

(d) Refraction of light

Option b - Dispersion of light

The number of colors contained in the sunlight is

(a) 3

(b) 5

(d) 7

Option d - 7

The optical phenomenon that is primarily responsible for the observation of a rainbow on a rainy day is

(a) diffraction

(b) interference

(d) reflection

Option c - dispersion

Which of these travels in glass with minimum velocity?

(a) red light

(b) violet light

(d) yellow light

Option b - violet light

What is the color of the light emitted by the Sun?

(a) White

(b) Red

(d) Orange

Option a - White

When a beam of white light passes through a glass prism, the color of the light beam that deviates the least is

(a) blue

(b) red

(d) violet

Option b - red

When a beam of white light is allowed to fall on a prism, the maximum deviation of the emerging light occurs for

(a) red light

(b) violet light

(d) blue light

Option b - violet light

A simple harmonic oscillator has a displacement of 0.02 m and acceleration equal to 2.0 m/s² at any time the frequency of oscillation will be :

(A) 100 Hz

(B) 10 Hz

(D) 1.59 Hz

Option d - 1.59 Hz

The maximum speed of the particle executing SHM is 1 m/s and the maximum acceleration is 1.57 m/s². Then the period is :

(A) 0.25 S

(B) 4 s

(D) 1/1.57 s

Option b - 4 s

If the earth is a homogenous sphere and a straight hole is bored in it through its center. A body is dropped into the hole then the body performs SHM with period :

(A) 842 s

(B) 84.6 s

(D) 24 hr

Option c - 5076 s

A particle of mass 1 kg is moving in an S.H.M. with an amplitude of 0.02 m and a frequency of 60 Hz. The maximum force acting on the particle is :

(A) 2880 N

(B) 1440 N

(D) 288 N

Option a - 2880 N

A particle performing linear SHM has a velocity of 10 cm/s when it passes through the mean position, if the amplitude of SHM is 2 cm, its velocity at the midpoint between the mean and extreme position :

(A) 5 cm/s

(B) 7.071 cm/s

(D) 10 cm/s

Option c - 8.66 cm/s

In a gasoline engine, the motion of the piston is SHM. The piston has a mass of 2 kg and a stroke of 10 cm. Find the maximum force on the piston if it makes 50 vibrations per minute :

(A) 27.4 N

(B) 2.74 N

(D) 27.4 dyne

Option b - 2.74 N

If a Carnot engine is working between the steam point and the ice point, then its efficiency will be

(A) 24.9%

(B) 25.7%

(D) 28.8%

Option c - 26.8%

A Carnot engine absorbs 750 J of heat energy from a reservoir at 137 °C and rejects 500 J of heat during each cycle, then the temperature of the sink is

(A) 0.25 °C

(B) 0.34 °C

(D) 0.54 °C

Option b - 0.34 °C

A Carnot engine whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be

(A) 1200 K

(B) 750 K

(D) 800 K

Option b - 750 K

A refrigerator is to maintain eatables kept inside at 7 °C. The coefficient of performance of a refrigerator if the room temperature is 38 °C is

(A) 15.5

(B) 16.3

(D) 9.03

Option d - 9.03

If the coefficient of performance of a refrigerator is 5 and operates at the room temperature of 27 °C, the temperature inside the refrigerator is

(A) 240 K

(B) 250 K

(D) 260 K

Option b - 250 K

A Carnot's cycle operating between T₁=600 K and T₂ = 300 K produces 1.5 kJ of mechanical work per cycle. The heat transferred to the engine by the reservoirs is

(A) 2.5 kJ

(B) 3 kJ

(D) 4 kJ

Option b - 3 kJ

Consider a Carnot cycle operating between source 750 K and sink temperature 350 K producing 1.25 kJ of mechanical work per cycle, the heat transferred to the engine by the reservoirs

(A) 1.5 kJ

(B) 2.34 kJ

(D) 4.34 kJ

Option b - 2.34 kJ

Two moles of an ideal monoatomic gas occupy a volume of 2V at a temperature of 300 K, it expands to a volume of 4V adiabatically, then the final temperature of the gas is

(A) 179 K

(B) 189 K

(D) 219 K

Option b - 189 K

An engine has an efficiency of 0.25 when the temperature of the sink is reduced by 58 °C, if its efficiency is doubled, then the temperature of the source is

(A) 150 °C

(B) 222 °C

(D) 232 °C

Option d - 232 °C

The temperature of a refrigerator is kept at 7 °C to keep the food articles kept in it in good condition. What is its coefficient of performance, if the room temperature is 37 °C?

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(A) 7.5

(B) 8.3

(D) 10.5

Option c - 9.33

A household refrigerator has a coefficient of performance of 6. If the room temperature outside the refrigerator is 30 °C, what is the lowest temperature that can be obtained inside the refrigerator?

(A) 0 °C

(B) 0 K

(D) -30 °C

Option c - - 13 °C

The coefficient of performance of a refrigerator working between -3 °C and 27 °C is :

(A) 3

(B) 4

(D) 9

Option d - 9

A refrigerator whose coefficient of performance is 5 extracts heat from the cooling compartment at the rate of 250 J per cycle. The work required per cycle to operate the refrigerator is :

(A) 50 J

(B) 500 J

(D) 1250 J

Option a - 50 J

A refrigerator, with its power 'ON', is kept in a closed room with its door open. The temperature of the room will :

(A) Rise

(B) Fall

(D) Rise or fall depending on the area of the room

Option a - Rise

A refrigerator is a :

(A) a Heat engine

(B) An electric motor

(D) an Air cooler

Option c - a Heat engine working in the backward direction

In an ideal refrigerator, heat from inside at 280 K is transferred to a room at 300 K. What is the amount of heat (in joule) which will be transferred to the room for each joule of electrical energy consumed in the process?

(A) 12 J

(B) 13 J

(D) 18 J

Option c - 15 J

A refrigerator absorbs 2000 cal of heat from ice trays. If the coefficient of performance is 4, then the work done by the motor is :

(A) 500 J

(B) 2100 J

(D) 8400 J

Option b - 2100 J

The coefficient of performance of a refrigerator working between 10 °C and 20 °C is :

(A) 2.83

(B) 5.66

(D) 56.6

Option c - 28.3

Refrigerator A works between -10 °C and 27 °C while refrigerator B works between -27 °C and 17 °C both removing heats equal to 2000 J from the freezer. Which of the two is the better refrigerator?

(A) A

(B) B

(D) cannot be predicted

Option a - A

The efficiency of a heat engine is 50% and the temperature of the sink is 500 K. If the temperature of the source is kept constant and its efficiency is to be raised to 60%, then the required temperature of the sink should be :

(A) 300 K

(B) 400 K

(D) 600 K

Option b - 400 K

An engine has an efficiency of 1/6. When the temperature of the sink is reduced by 62 °C, its efficiency is doubled. What is the temperature of the source?

(A) 37 °C

(B) 60 °C

(D) 124 °C

Option c - 99 °C

A refrigerator acts as

(A) A heat engine

(B) an Air cooler

(D) an Electric motor

Option a - A heat engine

If the door of a refrigerator is kept open, then which of the following is true?

(A) Room is cooled

(B) Room is heated

(D) Room is neither cooled nor heated

Option b - Room is heated

The temperatures of the source and the sink of a heat engine are 127 °C and 27 °C respectively. An inventor claims its efficiency to be 30%, then :

(A) it is impossible

(B) it is possible with a high probability

(D) data is insufficient

Option a - it is impossible

A heat engine absorbs 1000 J of heat from a hot reservoir at 127 °C and rejects 600 J of heat during each cycle. The efficiency of the engine is :

(A) 10 %

(B) 20 %

(D) 40 %

Option d - 40 %

An ideal heat engine exhausting heat at 27 °C is to have 25 % efficiency. It must take the heat at :

(A) 127 °C

(B) 227 °C

(D) 673 °C

Option a - 127 °C

An automobile engine absorbs 1600 J from a source and expels 1000 J to a sink in each cycle. The maximum work done in each cycle is :

(A) 300 J

(B) 600 J

(D) 2600 J

Option b - 600 J

An engine takes compressed steam at 127 °C and rejects it at 47 °C. The efficiency of the engine is :

(A) 20%

(B) 35 %

(D) 60 %

Option a - 20%

A scientist says that if the efficiency of his heat engine which operates at a source temperature of 127 °C and sink temperature of 27 °C is 26%, then :

(A) It is impossible

(B) It is possible but less probable

(D) Data is incomplete

Option a - It is impossible

A heat engine has an efficiency of 1/3. The amount of work this heat engine can perform per kcal of heat input is :

(A) 700 cal

(B) 1400 cal

(D) 1400 J

Option d - 1400 J

What is the value of sink temperature when the efficiency of the heat engine is 100 %?

(A) 0 K

(B) 273 K

(D) 400 K

Option a - 0 K

The specific heat of a gas in an isothermal process is :

(A) Infinite

(B) Zero

(D) Remains constant

Option a - Infinite

Work done in an adiabatic change in a gas depends only on :

(A) Change in pressure

(B) Change in volume

(D) Change in entropy

Option c - Change in temperature

1 gram of an ideal gas expands isothermally, heat flow will be :

(A) From the gas to the outside atmosphere

(B) From the outside atmosphere to the gas

(D) Both 'a' and 'b'

Option b - From the outside atmosphere to the gas

The slope of an adiabatic curve is always :

(A) Greater than the isothermal curve

(B) Less than the isothermal curve

(D) Equal to one

Option a - Greater than the isothermal curve

A sample of gas expands from volume V₁ to V₂ The amount of work done by the gas is greatest when the expansion is :

(A) Isothermal

(B) Adiabatic

(D) Equal in all cases

Option c - Isobaric

A diatomic gas initially at 18°C has compressed adiabatically to 1/8 th of its original volume. The temperature after compression will be :

(A) 18° C

(B) 887.4° C

(D) 395.4° C

Option d - 395.4° C

In the isothermal expansion, the pressure is determined by :

(A) Temperature only

(B) Compressibility only

(D) Volume only

Option b - Compressibility only

In an isothermal process : ( 11th physics focus guide )

(A) Heat exchanged is constant

(B) Expansion ratio is constant

(D) Volume is constant

Option a - Heat exchanged is constant

A gas does 4.5 J of external work during adiabatic expansion. Its temperature falls by 2 K. Its internal energy will :

(A) Increase by 4.5 J

(B) Decrease by 4.5 J

(D) Increase by 9 J

Option b - Decrease by 4.5 J

An ideal gas is enclosed in a cylinder-piston arrangement and undergoes adiabatic compression. The work done on the gas is 4 J. Which of the following statement is correct? :

(A) dQ = 0, dU = 0, dW = 4J

(B) dQ = 0, dU =4 J dW = -4J

(D) dQ = 0, dU = -4 J, dW = 4J

Option b - dQ = 0, dU =4 J dW = -4J

Heat given to a system is 35 J and work done by the system is 15 J. The change in the internal energy of the system will be :

(A) - 50 J

(B) 20 J

(D) 50 J

Option b - 20 J

A thermodynamical system absorbs 100 cal of heat and performs 30 J of work. If J = 4.2 J/cal, the change in its internal energy will be :

(A) 14 J

(B) 390 J

(D) 450 J

Option b - 390 J

When the amount of work done is 333 cal and the change in internal energy is 167 cal, then the heat supplied is.

(A) 166 cal

(B) 333 cal

(D) 400 cal

Option c - 500 cal

In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas released 20 J of heat and 8 J of work was done on the gas. If the initial internal energy of the gas was 30 J, then the final internal energy will be :

(A) 2 J

(B) 42 J

(D) 58 J

Option c - 18 J

During the adiabatic expansion of 2 moles of a gas, the change in the internal energy was found to be - 100 J. The work done during the process was :

(A) Zero

(B) - 100 J

(D) 100 J

Option d - 100 J

During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2J. The work done during the process by gas will be equal to :

(A) 1 J

(B) -1 J

(D) - 2J

Option c - 2 J

In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out 30 J of heat, and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be :

(A) Zero

(B) 80 J

(D) - 20 J

Option c - 20 J

A gas receives an amount of heat equal to 210 J and performs 140 J of work. The change in the internal energy of the gas is :

(A) 70 J

(B) 110 J

(D) 40 J

Option a - 70 J

One mole of an ideal gas requires 207 J to raise the temperature by 10 K when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by the same 10K, the heat required is (Given: Universal gas constant R= 8.3 J/mol K) :

(A) 215.3 J

(B) 124 J

(D) 198.7 J

Option b - 124 J

Which of the following cannot determine the state of a thermodynamic system?:

(A) Pressure and volume

(B) Volume and temperature

(D) Any one of pressure, volume, or temperature

Option d - Any one of pressure, volume, or temperature

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11th Physics Focus Guide Objective for Students

Two convex lenses with power 2 D are kept in contact with each other. The focal length of the combined lens system is

The splitting of different colors of light in a prism is

The number of colors contained in the sunlight is

The optical phenomenon that is primarily responsible for the observation of a rainbow on a rainy day is

Which of these travels in glass with minimum velocity?

What is the color of the light emitted by the Sun?

When a beam of white light passes through a glass prism, the color of the light beam that deviates the least is

When a beam of white light is allowed to fall on a prism, the maximum deviation of the emerging light occurs for

A simple harmonic oscillator has a displacement of 0.02 m and acceleration equal to 2.0 m/s² at any time the frequency of oscillation will be :

The maximum speed of the particle executing SHM is 1 m/s and the maximum acceleration is 1.57 m/s². Then the period is :

If the earth is a homogenous sphere and a straight hole is bored in it through its center. A body is dropped into the hole then the body performs SHM with period :

A particle of mass 1 kg is moving in an S.H.M. with an amplitude of 0.02 m and a frequency of 60 Hz. The maximum force acting on the particle is :

A particle performing linear SHM has a velocity of 10 cm/s when it passes through the mean position, if the amplitude of SHM is 2 cm, its velocity at the midpoint between the mean and extreme position :

In a gasoline engine, the motion of the piston is SHM. The piston has a mass of 2 kg and a stroke of 10 cm. Find the maximum force on the piston if it makes 50 vibrations per minute :

If a Carnot engine is working between the steam point and the ice point, then its efficiency will be

A Carnot engine absorbs 750 J of heat energy from a reservoir at 137 °C and rejects 500 J of heat during each cycle, then the temperature of the sink is

A Carnot engine whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be

A refrigerator is to maintain eatables kept inside at 7 °C. The coefficient of performance of a refrigerator if the room temperature is 38 °C is

If the coefficient of performance of a refrigerator is 5 and operates at the room temperature of 27 °C, the temperature inside the refrigerator is

A Carnot's cycle operating between T₁=600 K and T₂ = 300 K produces 1.5 kJ of mechanical work per cycle. The heat transferred to the engine by the reservoirs is

Consider a Carnot cycle operating between source 750 K and sink temperature 350 K producing 1.25 kJ of mechanical work per cycle, the heat transferred to the engine by the reservoirs

Two moles of an ideal monoatomic gas occupy a volume of 2V at a temperature of 300 K, it expands to a volume of 4V adiabatically, then the final temperature of the gas is

An engine has an efficiency of 0.25 when the temperature of the sink is reduced by 58 °C, if its efficiency is doubled, then the temperature of the source is

The temperature of a refrigerator is kept at 7 °C to keep the food articles kept in it in good condition. What is its coefficient of performance, if the room temperature is 37 °C?

A household refrigerator has a coefficient of performance of 6. If the room temperature outside the refrigerator is 30 °C, what is the lowest temperature that can be obtained inside the refrigerator?

The coefficient of performance of a refrigerator working between -3 °C and 27 °C is :

A refrigerator whose coefficient of performance is 5 extracts heat from the cooling compartment at the rate of 250 J per cycle. The work required per cycle to operate the refrigerator is :

A refrigerator, with its power 'ON', is kept in a closed room with its door open. The temperature of the room will :

A refrigerator is a :

In an ideal refrigerator, heat from inside at 280 K is transferred to a room at 300 K. What is the amount of heat (in joule) which will be transferred to the room for each joule of electrical energy consumed in the process?

A refrigerator absorbs 2000 cal of heat from ice trays. If the coefficient of performance is 4, then the work done by the motor is :

The coefficient of performance of a refrigerator working between 10 °C and 20 °C is :

Refrigerator A works between -10 °C and 27 °C while refrigerator B works between -27 °C and 17 °C both removing heats equal to 2000 J from the freezer. Which of the two is the better refrigerator?

The efficiency of a heat engine is 50% and the temperature of the sink is 500 K. If the temperature of the source is kept constant and its efficiency is to be raised to 60%, then the required temperature of the sink should be :

An engine has an efficiency of 1/6. When the temperature of the sink is reduced by 62 °C, its efficiency is doubled. What is the temperature of the source?

A refrigerator acts as

If the door of a refrigerator is kept open, then which of the following is true?

The temperatures of the source and the sink of a heat engine are 127 °C and 27 °C respectively. An inventor claims its efficiency to be 30%, then :

A heat engine absorbs 1000 J of heat from a hot reservoir at 127 °C and rejects 600 J of heat during each cycle. The efficiency of the engine is :

An ideal heat engine exhausting heat at 27 °C is to have 25 % efficiency. It must take the heat at :

An automobile engine absorbs 1600 J from a source and expels 1000 J to a sink in each cycle. The maximum work done in each cycle is :

An engine takes compressed steam at 127 °C and rejects it at 47 °C. The efficiency of the engine is :

A scientist says that if the efficiency of his heat engine which operates at a source temperature of 127 °C and sink temperature of 27 °C is 26%, then :

A heat engine has an efficiency of 1/3. The amount of work this heat engine can perform per kcal of heat input is :

What is the value of sink temperature when the efficiency of the heat engine is 100 %?

The specific heat of a gas in an isothermal process is :

Work done in an adiabatic change in a gas depends only on :

1 gram of an ideal gas expands isothermally, heat flow will be :

The slope of an adiabatic curve is always :

A sample of gas expands from volume V₁ to V₂ The amount of work done by the gas is greatest when the expansion is :

A diatomic gas initially at 18°C has compressed adiabatically to 1/8 th of its original volume. The temperature after compression will be :

In the isothermal expansion, the pressure is determined by :

In an isothermal process : ( 11th physics focus guide )

A gas does 4.5 J of external work during adiabatic expansion. Its temperature falls by 2 K. Its internal energy will :

An ideal gas is enclosed in a cylinder-piston arrangement and undergoes adiabatic compression. The work done on the gas is 4 J. Which of the following statement is correct? :

Heat given to a system is 35 J and work done by the system is 15 J. The change in the internal energy of the system will be :

A thermodynamical system absorbs 100 cal of heat and performs 30 J of work. If J = 4.2 J/cal, the change in its internal energy will be :

When the amount of work done is 333 cal and the change in internal energy is 167 cal, then the heat supplied is.

In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas released 20 J of heat and 8 J of work was done on the gas. If the initial internal energy of the gas was 30 J, then the final internal energy will be :

During the adiabatic expansion of 2 moles of a gas, the change in the internal energy was found to be - 100 J. The work done during the process was :

During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2J. The work done during the process by gas will be equal to :

In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out 30 J of heat, and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be :

A gas receives an amount of heat equal to 210 J and performs 140 J of work. The change in the internal energy of the gas is :

One mole of an ideal gas requires 207 J to raise the temperature by 10 K when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by the same 10K, the heat required is (Given: Universal gas constant R= 8.3 J/mol K) :

Which of the following cannot determine the state of a thermodynamic system?:

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