1
JEE Advanced 2020 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-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)
A
power radiated by the filament is in the range 642 W to 645 W
B
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
C
the wavelength corresponding to the maximum intensity of light is 1160 nm
D
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
2
JEE Advanced 2019 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-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, 21.2 = 2.3; 23.2 = 9.2; R is a gas constant)
A
The final pressure of the gas mixture after compression is in between 9P0 and 10P0
B
The average kinetic energy of the gas mixture after compression is in between 18RT0 and 19RT0
C
Adiabatic constant of the gas mixture is 1.6
D
The work |W| done during the process is 13RT0
3
JEE Advanced 2019 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
One mole of a monatomic ideal gas goes through a thermodynamic cycle, as shown in the volume versus temperature (V-T) diagram. The correct statement(s) is/are [R is the gas constant]

A
Work done in this thermodynamic cycle (1$$\to$$2$$\to$$3$$\to$$4$$\to$$1) is $$\left| W \right| = {1 \over 2}R{T_0}$$.
B
The ratio of heat transfer during processes 1$$\to$$2 and 2$$\to$$3 is $$\left| {{{{Q_{1 \to 2}}} \over {{Q_{2 \to 3}}}}} \right| = {5 \over 3}$$
C
The above thermodynamic cycle exhibits only isochoric and adiabatic processes.
D
The ratio of heat transfer during processes 1$$\to$$2 and 3$$\to$$4 is $$\left| {{{{Q_{1 \to 2}}} \over {{Q_{3 \to 4}}}}} \right| = {1 \over 2}$$
4
JEE Advanced 2018 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (where $$V$$ is the volume and $$T$$ is the temperature). Which of the statements below is (are) true?

A
Process $${\rm I}$$ is an isochoric process
B
In process $${\rm II}$$, gas absorbs heat
C
In process $${\rm IV}$$, gas releases heat
D
Process $${\rm I}$$ and $${\rm III}$$ are not isobaric
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