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IIT Jam Physics qna for Students
For which process is the change in internal energy (dU) equal to zero?
a) Isochoric process
b) Isobaric process
c) Isothermal process
d) Adiabatic process
Option c – Isothermal process
In which process does the relation dQ = dU hold true?
a) Isothermal process
b) Cyclic process
c) Isochoric process
d) Adiabatic process
Option c – Isothermal process
An ideal gas undergoing isothermal expansion implies that:
a) Its Heat content remains unchanged
b) Both its temperature and Heat content remain constant
c) Its temperature remains constant
d) Its volume remains constant
Option b – Both its temperature and Heat content remain constant
During an isothermal process, which statement is incorrect?
a) Temperature stays constant
b) Internal energy does not change
c) No Heat is exchanged with the surroundings
d) The process occurs slowly
Option c – No Heat is exchanged with the surroundings
One gram mole of an ideal gas expands adiabatically from temperature T₁ to T₂ (T₁ > T₂). The work done by the gas is:
a) Cv (T₁ − T₂)
b) Cp (T₁ − T₂)
c) 1
d) Zero
Option a – Cv (T₁ − T₂)
In an isothermal process, the supplied Heat is mainly used for:
a) Increasing the temperature
b) Performing external work
c) Increasing temperature as well as doing external work
d) Increasing internal energy
Option b – Performing external work
The relation dU = −dW is valid for which process?
a) Isothermal process
b) Adiabatic process
c) Isobaric process
d) Isochoric process
Option b – Adiabatic process
A thermodynamic system changes from (i) P₁, V to 2P₁, V and (ii) P₁, V to P₁, 2V. The work done in these two cases is:
a) (i) zero, (ii) zero
b) (i) zero, (ii) P₁V
c) (i) P₁V, (ii) zero
d) (i) P₁V, (ii) P₁V
Option b – (i) zero, (ii) P₁V
During adiabatic expansion of a gas:
a) dU = 0
b) dU is negative
c) dU is positive
d) dW = 0
Option b – dU is negative
An adiabatic process occurs at constant:
a) Temperature
b) Pressure
c) Heat
d) Temperature and pressure
Option c – Heat
When 1 gram of an ideal gas undergoes isothermal expansion, the Heat flow is:
a) From the gas to the surroundings
b) From the surroundings to the gas
c) Zero
d) Sometimes from gas to surroundings and sometimes vice versa
Option b – From the surroundings to the gas
In an isothermal change, an ideal gas follows:
a) Boyle’s law
b) Charles’ law
c) Gay-Lussac’s law
d) Stefan’s law
Option a – Boyle’s law
Arrange the following processes in increasing order of work done by the gas:
a) Adiabatic > Isothermal > Isobaric
b) Isobaric > Isothermal > Adiabatic
c) Adiabatic > Isobaric > Isothermal
d) Adiabatic < Isobaric < Isothermal
Option b – Isobaric > Isothermal > Adiabatic
When a gas expands adiabatically:
a) No energy is required for expansion
b) energy is supplied by the container
c) Internal energy of the gas is used to do work
d) The law of conservation of energy is violated
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