Thermodynamics PYQs Set 16 (PDF)

Set 16 of 16 · Questions 451-459 of 459

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Mere Teacher · Previous Year Questions NEET Physics · Thermodynamics · Set 16 (Q451-459)
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451. $The first operation involved in a Carnot cycle is$ (1) $Isothermal expansion$ (2) $Adiabatic expansion$ (3) $Isothermal compression$ (4) $Adiabatic compression$ 452. $The efficiency of Carnot engine when source temperature is T_{1} and sink temperature is T_{2} will be$ (1) $\frac{T _{1} - T _{2}}{T _{1}}$ (2) $\frac{T _{2} - T _{1}}{T _{2}}$ (3) $\frac{T _{1} - T _{2}}{T _{2}}$ (4) $\frac{T _{1}}{T _{2}}$ 453. $The value of critical temperature in terms of van der Waals’ constant a and b is given by$ (1) $T_{c} = \frac{8 a}{27 Rb}$ (2) $T_{c} = \frac{27 a}{8 Rb}$ (3) $T_{c} = \frac{a}{2 Rb}$ (4) $T_{c} = \frac{a}{27 Rb} .$ 454. $Two objects made of the same material have masses ' m' and ' 2 m' and are at temperatures ' 2 T' and ' T' respectively. When heat ' Q' is supplied to the object of mass ' 2 m', its temperature raises to ' 2 T'. If the same heat is supplied to the object of mass ' m', its temperature raises to$ (1) $2 T$ (2) $3 T 2$ (3) $4 T$ (4) $3 T$ 455. $The freezer in a refrigerator is located at the top section so that$ (1) $the entire chamber of the refrigerator is cooled quickly due to convection$ (2) $the motor is not heated$ (3) $the heat gained from the environment is high$ (4) $the heat gained from the environment is low.$ 456. $One mole of an ideal gas goes from an initial state A to final state B via two processes: It first undergoes isothermal expansion from volume V to 3 V and then its volume is reduced from 3 V to V at constant pressure. The correct P‐V diagram representing the two processes is$ (1) (2) (3) (4) 457. $A car engine has a power of 20 kW . The car makes a roundtrip of 1 hour. If the thermal efficiency of the engine is 40 % and the ambient temperature is 300 K . The energy generated by fuel combustion is$ (1) $180000 kJ$ (2) $240000 kJ$ (3) $360000 kJ$ (4) $270000 kJ$ 458. $Irreversible process is$ (1) $Adiabatic process$ (2) $Joule-Thomson expansion$ (3) $Ideal isothermal process$ (4) $None of the above$ 459. $Match the thermodynamic processes taking place in a system with the correct conditions. In the table: Δ Q is the heat supplied, Δ W is the work done and Δ U is change in internal energy of the system Process? Process Condition (I) Adiabatic (A) Δ W = 0 (II) Isothermal (B) Δ Q = 0 (III) Isochoric (C) Δ U \neq = 0, Δ W \neq = 0, Δ Q \neq = 0 (IV) Isobaric (D) Δ U = 0$ (1) $(I) - (A), (II) - (A), (III) - (B), (IV) - (C)$ (2) $(I) - (B), (II) - (D), (III) - (A), (IV) - (C)$ (3) $(I) - (A), (II) - (B), (III) - (D), (IV) - (D)$ (4) $(I) - (B), (II) - (A), (III) - (D), (IV) - (C)$