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NEET Chemistry: Types of processes Practice Questions

15 free multiple-choice questions on Types of processes (Chemical Thermodynamics) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

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  1. Q1. Which of the following processes is characterized by the absence of heat exchange with the surroundings?

    • AIsothermal process
    • BIsobaric process
    • CAdiabatic process
    • DIsochoric process
    Show answer & explanation

    Correct answer: C — Adiabatic process

    An adiabatic process is a thermodynamic process in which no heat is exchanged with the surroundings.

  2. Q2. Which type of process occurs when the volume of the system is kept constant?

    • AAdiabatic process
    • BIsochoric process
    • CIsobaric process
    • DIsothermal process
    Show answer & explanation

    Correct answer: B — Isochoric process

    An isochoric process is defined as a process where the volume of the system remains constant (V = constant).

  3. Q3. Which process occurs at constant temperature?

    • AIsothermal process
    • BAdiabatic process
    • CIsobaric process
    • DIsochoric process
    Show answer & explanation

    Correct answer: A — Isothermal process

    An isothermal process is one where the temperature of the system remains constant throughout the process.

  4. Q4. A process occurring at constant pressure is defined as:

    • AAdiabatic process
    • BIsochoric process
    • CIsobaric process
    • DIsothermal process
    Show answer & explanation

    Correct answer: C — Isobaric process

    An isobaric process is one where the pressure of the system remains constant (P = constant).

  5. Q5. A thermodynamic cycle is a process where the initial and final states of the system are identical. This type of process is called:

    • AIrreversible process
    • BCyclic process
    • CAdiabatic process
    • DReversible process
    Show answer & explanation

    Correct answer: B — Cyclic process

    A cyclic process is one where the system returns to its initial state, making the initial and final states the same.

  6. Q6. The change in Gibbs Free Energy (ΔG) determines the spontaneity of a process. If ΔG is negative, the process is:

    • AEquilibrium
    • BReversible
    • CNon-spontaneous
    • DSpontaneous
    Show answer & explanation

    Correct answer: D — Spontaneous

    A negative change in Gibbs Free Energy (ΔG < 0) indicates that the process is spontaneous (favorable).

  7. Q7. In an adiabatic process, the heat exchange (q) between the system and surroundings is:

    • ADependent on PV product
    • BEqual to the change in internal energy
    • CConstant
    • DZero
    Show answer & explanation

    Correct answer: D — Zero

    An adiabatic process is defined as a process occurring without any heat exchange, meaning q=0.

  8. Q8. Which type of process is defined by the reversal of the process being physically possible without any net change in the universe?

    • ASpontaneous process
    • BAdiabatic process
    • CReversible process
    • DIrreversible process
    Show answer & explanation

    Correct answer: C — Reversible process

    A reversible process is one that can be reversed without any net change in the universe (i.e., no entropy generation).

  9. Q9. Which process is characterized by expansion or compression occurring at constant pressure?

    • AIsochoric process
    • BIsobaric process
    • CIsothermal process
    • DAdiabatic process
    Show answer & explanation

    Correct answer: B — Isobaric process

    An isobaric process is defined as a process occurring at constant pressure (P = constant).

  10. Q10. A process where no heat is exchanged with the surroundings is called:

    • AIsothermal process
    • BIsobaric process
    • CIsochoric process
    • DAdiabatic process
    Show answer & explanation

    Correct answer: D — Adiabatic process

    An adiabatic process is a process where the system is thermally insulated, meaning no heat is exchanged with the surroundings (q = 0).

  11. Q11. If a process occurs at constant volume, which thermodynamic variable remains unchanged?

    • AVolume
    • BTemperature
    • CEnthalpy
    • DPressure
    Show answer & explanation

    Correct answer: A — Volume

    A process occurring at constant volume (isochoric process) means the volume of the system does not change.

  12. Q12. A process occurring at constant volume is called:

    • AAdiabatic process
    • BIsothermal process
    • CIsobaric process
    • DIsochoric process
    Show answer & explanation

    Correct answer: D — Isochoric process

    A process occurring at constant volume is defined as an isochoric process.

  13. Q13. If a system undergoes a closed cyclic process, what property remains constant throughout the cycle?

    • AInternal Energy
    • BVolume
    • CPressure
    • DWork
    Show answer & explanation

    Correct answer: A — Internal Energy

    In a cyclic process, the net change of a state function like internal energy is zero, although the total work done may not be zero.

  14. Q14. Which of the following processes is characterized by no heat exchange between the system and its surroundings?

    • AIsobaric process
    • BIsochoric process
    • CIsothermal process
    • DAdiabatic process
    Show answer & explanation

    Correct answer: D — Adiabatic process

    An adiabatic process is a thermodynamic process in which no heat is exchanged between the system and its surroundings (i.e., q=0).

  15. Q15. Which of the following describes a closed system?

    • AA system that can exchange only energy but not matter with surroundings
    • BA system that can exchange only matter but not energy with surroundings
    • CA system that can exchange both energy and matter with surroundings
    • DA system that cannot exchange either energy or matter with surroundings
    Show answer & explanation

    Correct answer: B — A system that can exchange only matter but not energy with surroundings

    A closed system is one where mass cannot cross the boundary, but energy (heat or work) can be exchanged with the surroundings.

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