JEE Advanced 2025 Paper 2 Online

MCQ (More than One Correct Answer)

-2

The efficiency of a Carnot engine operating with a hot reservoir kept at a temperature of 1000 K is 0.4 . It extracts 150 J of heat per cycle from the hot reservoir. The work extracted from this engine is being fully used to run a heat pump which has a coefficient of performance 10 . The hot reservoir of the heat pump is at a temperature of 300 K . Which of the following statements is/are correct :

Work extracted from the Carnot engine in one cycle is 60 J.

Temperature of the cold reservoir of the Carnot engine is 600 K.

Temperature of the cold reservoir of the heat pump is 270 K.

Heat supplied to the hot reservoir of the heat pump in one cycle is 540 J.

JEE Advanced 2022 Paper 2 Online

MCQ (More than One Correct Answer)

-2

In the given $P-V$ diagram, a monoatomic gas $\left(\gamma=\frac{5}{3}\right)$ is first compressed adiabatically from state $A$ to state $B$. Then it expands isothermally from state $B$ to state $C$. [Given: $\left(\frac{1}{3}\right)^{0.6} \simeq 0.5, \ln 2 \simeq 0.7$ ].

JEE Advanced 2022 Paper 2 Online Physics - Heat and Thermodynamics Question 22 English

Which of the following statement(s) is(are) correct?

The magnitude of the total work done in the process $A \rightarrow B \rightarrow C$ is $144 \mathrm{~kJ}$.

The magnitude of the work done in the process $B \rightarrow C$ is $84 \mathrm{~kJ}$.

The magnitude of the work done in the process $A \rightarrow B$ is $60 \mathrm{~kJ}$.

The magnitude of the work done in the process $C \rightarrow A$ is zero.

JEE Advanced 2020 Paper 1 Offline

MCQ (More than One Correct Answer)

-2

The filament of a light bulb has surface area 64 mm² . The filament can be considered as a black body at temperature 2500 K emitting radiation like a point source when viewed from far. At night the light bulb is observed from a distance of 100 m. Assume the pupil of the eyes of the observer to be circular with radius 3 mm. Then

(Take Stefan-Boltzmann constant = 5.67 $$ \times $$ 10⁻⁸ Wm⁻²K⁻⁴ , Wien’s displacement constant = 2.90 $$ \times $$ 10⁻³ m-K, Planck’s constant = 6.63 $$ \times $$ 10⁻³⁴ Js, speed of light in vacuum = 3.00 $$ \times $$ 10⁸ ms⁻¹)

power radiated by the filament is in the range 642 W to 645 W

radiated power entering into one eye of the observer is
in the range 3.15 $$ \times $$ 10⁻⁸ W to 3.25 $$ \times $$ 10⁻⁸ W

the wavelength corresponding to the maximum intensity of light is 1160 nm

taking the average wavelength of emitted radiation to be 1740 nm, the total number of photons entering per second into one eye of the observer is in the range 2.75 $$ \times $$ 10¹¹ to 2.85 $$ \times $$ 10¹¹

JEE Advanced 2019 Paper 2 Offline

MCQ (More than One Correct Answer)

-1

A mixture of ideal gas containing 5 moles of monatomic gas and 1 mole of rigid diatomic gas is initially at pressure P₀, volume V₀, and temperature T₀. If the gas mixture is adiabatically compressed to a volume $${{{V_0}} \over 4}$$, then the correct statement(s) is/are

(Given, 2^1.2 = 2.3; 2^3.2 = 9.2; R is a gas constant)

The final pressure of the gas mixture after compression is in between 9P₀ and 10P₀

The average kinetic energy of the gas mixture after compression is in between 18RT₀ and 19RT₀

Adiabatic constant of the gas mixture is 1.6

The work |W| done during the process is 13RT₀

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