1
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The graph between two temperature scales P and Q is shown in the figure. Between upper fixed point and lower fixed point there are 150 equal divisions of scale P and 100 divisions on scale Q. The relationship for conversion between the two scales is given by :-

JEE Main 2023 (Online) 25th January Evening Shift Physics - Heat and Thermodynamics Question 56 English

A
$${{{t_P}} \over {100}} = {{{t_Q} - 180} \over {150}}$$
B
$${{{t_P}} \over {180}} - {{{t_Q} - 40} \over {100}}$$
C
$${{{t_Q}} \over {150}} = {{{t_P} - 180} \over {100}}$$
D
$${{{t_Q}} \over {100}} = {{{t_P} - 30} \over {150}}$$
2
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

According to law of equipartition of energy the molar specific heat of a diatomic gas at constant volume where the molecule has one additional vibrational mode is :-

A
$$\frac{9}{2}R$$
B
$$\frac{5}{2}R$$
C
$$\frac{3}{2}R$$
D
$$\frac{7}{2}R$$
3
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The root mean square velocity of molecules of gas is

A
Proportional to temperature ($$T$$)
B
Inversely proportional to square root of temperature $$\left( {\sqrt {{1 \over T}} } \right)$$
C
Proportional to square of temperature ($$T^2$$)
D
Proportional to square root of temperature ($$\sqrt T$$)
4
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

A Carnot engine with efficiency 50% takes heat from a source at 600 K. In order to increase the efficiency to 70%, keeping the temperature of sink same, the new temperature of the source will be :

A
300 K
B
1000 K
C
900 K
D
360 K
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