148243
During an isothermal expansion of an ideal gas:
1 its internal energy decreases
2 its internal energy does not change
3 the work done by the gas is equal to the quantity of heat absorbed by it
4 both (b) and (c) are correct
Explanation:
D For isothermal process, no change in temperature. $\mathrm{T}=\text { constant }$ $\mathrm{dU}=0$ $\mathrm{Q}=+\mathrm{W}$ $\because$ All the heat added to the system is used to do work.
UPSEE - 2005
Thermodynamics
148245
The initial pressure and volume of a gas are $P_{1}$ and $V_{1}$, the gas after expansion attains final volume $V_{2}$. Let $W_{1}, W_{2}$ and $W_{3}$ are the corresponding work done by the gas under isothermal, adiabatic and isobaric processes respectively then
1 $\mathrm{W}_{1}=\mathrm{W}_{2}=\mathrm{W}_{3}$
2 $\mathrm{W}_{2}>\mathrm{W}_{1}>\mathrm{W}_{3}$
3 $\mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
4 $\mathrm{W}_{3}>\mathrm{W}_{2}>\mathrm{W}_{1}$
Explanation:
C Work done $=$ Area under the curve $\therefore \mathrm{W}_{\text {isobaric }}$ is largest and $\mathrm{W}_{\text {adiabatic }}$ is smallest. $\therefore \mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
CG PET -2016
Thermodynamics
148252
Internal energy of a gas remains unchanged in I. an isothermal process II. an adiabatic process III. a reversible process IV. a cyclic process Which of these are true?
1 I and IV
2 I, III and IV
3 III and IV
4 II and III
Explanation:
A The internal energy of the system remains constant in isothermal process. For isothermal process, $\mathrm{dU}=0$ For cyclic process, $\mathrm{dU}=0$ i.e. internal energy remains unchanged
Manipal UGET -2020
Thermodynamics
148267
The phenomenon of sound propagation in air is
1 Isothermal process
2 Adiabatic process
3 Isobaric process
4 Isochoric process
Explanation:
B Laplace gave the theory which pointed out that sound travels through air under adiabatic conditions, because of following reasons- (i) Air is poor conductor of heat. (ii) When sound travels through air, then temperature rises in the regions. (iii) Since, compressions and rarefactions are formed so rapidly heat produce during compressions does not get time to pass into the region of rarefactions, so as to equalise the temperature. $\mathrm{v}=\sqrt{\frac{\gamma \mathrm{p}}{\rho}}$
148243
During an isothermal expansion of an ideal gas:
1 its internal energy decreases
2 its internal energy does not change
3 the work done by the gas is equal to the quantity of heat absorbed by it
4 both (b) and (c) are correct
Explanation:
D For isothermal process, no change in temperature. $\mathrm{T}=\text { constant }$ $\mathrm{dU}=0$ $\mathrm{Q}=+\mathrm{W}$ $\because$ All the heat added to the system is used to do work.
UPSEE - 2005
Thermodynamics
148245
The initial pressure and volume of a gas are $P_{1}$ and $V_{1}$, the gas after expansion attains final volume $V_{2}$. Let $W_{1}, W_{2}$ and $W_{3}$ are the corresponding work done by the gas under isothermal, adiabatic and isobaric processes respectively then
1 $\mathrm{W}_{1}=\mathrm{W}_{2}=\mathrm{W}_{3}$
2 $\mathrm{W}_{2}>\mathrm{W}_{1}>\mathrm{W}_{3}$
3 $\mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
4 $\mathrm{W}_{3}>\mathrm{W}_{2}>\mathrm{W}_{1}$
Explanation:
C Work done $=$ Area under the curve $\therefore \mathrm{W}_{\text {isobaric }}$ is largest and $\mathrm{W}_{\text {adiabatic }}$ is smallest. $\therefore \mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
CG PET -2016
Thermodynamics
148252
Internal energy of a gas remains unchanged in I. an isothermal process II. an adiabatic process III. a reversible process IV. a cyclic process Which of these are true?
1 I and IV
2 I, III and IV
3 III and IV
4 II and III
Explanation:
A The internal energy of the system remains constant in isothermal process. For isothermal process, $\mathrm{dU}=0$ For cyclic process, $\mathrm{dU}=0$ i.e. internal energy remains unchanged
Manipal UGET -2020
Thermodynamics
148267
The phenomenon of sound propagation in air is
1 Isothermal process
2 Adiabatic process
3 Isobaric process
4 Isochoric process
Explanation:
B Laplace gave the theory which pointed out that sound travels through air under adiabatic conditions, because of following reasons- (i) Air is poor conductor of heat. (ii) When sound travels through air, then temperature rises in the regions. (iii) Since, compressions and rarefactions are formed so rapidly heat produce during compressions does not get time to pass into the region of rarefactions, so as to equalise the temperature. $\mathrm{v}=\sqrt{\frac{\gamma \mathrm{p}}{\rho}}$
NEET Test Series from KOTA - 10 Papers In MS WORD
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Thermodynamics
148243
During an isothermal expansion of an ideal gas:
1 its internal energy decreases
2 its internal energy does not change
3 the work done by the gas is equal to the quantity of heat absorbed by it
4 both (b) and (c) are correct
Explanation:
D For isothermal process, no change in temperature. $\mathrm{T}=\text { constant }$ $\mathrm{dU}=0$ $\mathrm{Q}=+\mathrm{W}$ $\because$ All the heat added to the system is used to do work.
UPSEE - 2005
Thermodynamics
148245
The initial pressure and volume of a gas are $P_{1}$ and $V_{1}$, the gas after expansion attains final volume $V_{2}$. Let $W_{1}, W_{2}$ and $W_{3}$ are the corresponding work done by the gas under isothermal, adiabatic and isobaric processes respectively then
1 $\mathrm{W}_{1}=\mathrm{W}_{2}=\mathrm{W}_{3}$
2 $\mathrm{W}_{2}>\mathrm{W}_{1}>\mathrm{W}_{3}$
3 $\mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
4 $\mathrm{W}_{3}>\mathrm{W}_{2}>\mathrm{W}_{1}$
Explanation:
C Work done $=$ Area under the curve $\therefore \mathrm{W}_{\text {isobaric }}$ is largest and $\mathrm{W}_{\text {adiabatic }}$ is smallest. $\therefore \mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
CG PET -2016
Thermodynamics
148252
Internal energy of a gas remains unchanged in I. an isothermal process II. an adiabatic process III. a reversible process IV. a cyclic process Which of these are true?
1 I and IV
2 I, III and IV
3 III and IV
4 II and III
Explanation:
A The internal energy of the system remains constant in isothermal process. For isothermal process, $\mathrm{dU}=0$ For cyclic process, $\mathrm{dU}=0$ i.e. internal energy remains unchanged
Manipal UGET -2020
Thermodynamics
148267
The phenomenon of sound propagation in air is
1 Isothermal process
2 Adiabatic process
3 Isobaric process
4 Isochoric process
Explanation:
B Laplace gave the theory which pointed out that sound travels through air under adiabatic conditions, because of following reasons- (i) Air is poor conductor of heat. (ii) When sound travels through air, then temperature rises in the regions. (iii) Since, compressions and rarefactions are formed so rapidly heat produce during compressions does not get time to pass into the region of rarefactions, so as to equalise the temperature. $\mathrm{v}=\sqrt{\frac{\gamma \mathrm{p}}{\rho}}$
148243
During an isothermal expansion of an ideal gas:
1 its internal energy decreases
2 its internal energy does not change
3 the work done by the gas is equal to the quantity of heat absorbed by it
4 both (b) and (c) are correct
Explanation:
D For isothermal process, no change in temperature. $\mathrm{T}=\text { constant }$ $\mathrm{dU}=0$ $\mathrm{Q}=+\mathrm{W}$ $\because$ All the heat added to the system is used to do work.
UPSEE - 2005
Thermodynamics
148245
The initial pressure and volume of a gas are $P_{1}$ and $V_{1}$, the gas after expansion attains final volume $V_{2}$. Let $W_{1}, W_{2}$ and $W_{3}$ are the corresponding work done by the gas under isothermal, adiabatic and isobaric processes respectively then
1 $\mathrm{W}_{1}=\mathrm{W}_{2}=\mathrm{W}_{3}$
2 $\mathrm{W}_{2}>\mathrm{W}_{1}>\mathrm{W}_{3}$
3 $\mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
4 $\mathrm{W}_{3}>\mathrm{W}_{2}>\mathrm{W}_{1}$
Explanation:
C Work done $=$ Area under the curve $\therefore \mathrm{W}_{\text {isobaric }}$ is largest and $\mathrm{W}_{\text {adiabatic }}$ is smallest. $\therefore \mathrm{W}_{3}>\mathrm{W}_{1}>\mathrm{W}_{2}$
CG PET -2016
Thermodynamics
148252
Internal energy of a gas remains unchanged in I. an isothermal process II. an adiabatic process III. a reversible process IV. a cyclic process Which of these are true?
1 I and IV
2 I, III and IV
3 III and IV
4 II and III
Explanation:
A The internal energy of the system remains constant in isothermal process. For isothermal process, $\mathrm{dU}=0$ For cyclic process, $\mathrm{dU}=0$ i.e. internal energy remains unchanged
Manipal UGET -2020
Thermodynamics
148267
The phenomenon of sound propagation in air is
1 Isothermal process
2 Adiabatic process
3 Isobaric process
4 Isochoric process
Explanation:
B Laplace gave the theory which pointed out that sound travels through air under adiabatic conditions, because of following reasons- (i) Air is poor conductor of heat. (ii) When sound travels through air, then temperature rises in the regions. (iii) Since, compressions and rarefactions are formed so rapidly heat produce during compressions does not get time to pass into the region of rarefactions, so as to equalise the temperature. $\mathrm{v}=\sqrt{\frac{\gamma \mathrm{p}}{\rho}}$
