1
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
Which one is the correct option for the two different thermodynamic processes?

A
(a) only
B
(c) and (d)
C
(b) and (c)
D
(c) and (a)
2
JEE Main 2021 (Online) 17th March Morning Shift
+4
-1
A polyatomic ideal gas has 24 vibrational modes. What is the value of $$\gamma$$?
A
1.37
B
1.30
C
1.03
D
10.3
3
JEE Main 2021 (Online) 17th March Morning Shift
+4
-1
Two ideal polyatomic gases at temperatures T1 and T2 are mixed so that there is no loss of energy. If F1 and F2, m1 and m2, n1 and n2 be the degrees of freedom, masses, number of molecules of the first and second gas respectively, the temperature of mixture of these two gases is :
A
$${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{F_1} + {F_2}}}$$
B
$${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{n_1}{F_1} + {n_2}{F_2}}}$$
C
$${{{n_1}{T_1} + {n_2}{T_2}} \over {{n_1} + {n_2}}}$$
D
$${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{n_1} + {n_2}}}$$
4
JEE Main 2021 (Online) 17th March Morning Shift
+4
-1
Two identical metal wires of thermal conductivities K1 and K2 respectively are connected in series. The effective thermal conductivity of the combination is :
A
$${{2{K_1}{K_2}} \over {{K_1} + {K_2}}}$$
B
$${{{K_1} + {K_2}} \over {{K_1}{K_2}}}$$
C
$${{{K_1} + {K_2}} \over {2{K_1}{K_2}}}$$
D
$${{{K_1}{K_2}} \over {{K_1} + {K_2}}}$$
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