1
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The plot that depicts the behavior of the mean free time t (time between two successive collisions) for the molecules of an ideal gas, as a function of temperature (T), qualitatively, is:
(Graphs are schematic and not drawn to scale)
A
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 245 English Option 1
B
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 245 English Option 2
C
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 245 English Option 3
D
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 245 English Option 4
2
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A thermodynamic cycle xyzx is shown on a V-T diagram. JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 244 English The P-V diagram that best describes this cycle is :
(Diagrams are schematic and not to scale)
A
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 244 English Option 1
B
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 244 English Option 2
C
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 244 English Option 3
D
JEE Main 2020 (Online) 8th January Morning Slot Physics - Heat and Thermodynamics Question 244 English Option 4
3
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Two ideal Carnot engines operate in cascade (all heat given up by one engine is used by the other engine to produce work) between temperature, T1 and T2 . The temperature of the hot reservoir of the first engine is T1 and the temperature of the cold reservoir of the second engine is T2 . T is temperature of the sink of first engine which is also the source for the second which is also the source for the second engine. How is T related to T1 and T2 . If both engines perform equal amount of work?
A
$$T = {{2{T_1}{T_2}} \over {{T_1} + {T_2}}}$$
B
$$T = \sqrt {{T_1}{T_2}} $$
C
$$T = {{{T_1} + {T_2}} \over 2}$$
D
T = 0
4
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Under an adiabatic process, the volume of an ideal gas gets doubled. Consequently the mean collision time between the gas molecule changes from $${\tau _1}$$ to $${\tau _2}$$ . If $${{{C_p}} \over {{C_v}}} = \gamma $$ for this gas then a good estimate for $${{{\tau _2}} \over {{\tau _1}}}$$ is given by :
A
$${\left( 2 \right)^{{{1 + \gamma } \over 2}}}$$
B
2
C
$${\left( {{1 \over 2}} \right)^{{{1 + \gamma } \over 2}}}$$
D
$${\left( {{1 \over 2}} \right)^\gamma }$$
JEE Main Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12