1
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
Two moles of helium are mixed with n moles of hydrogen. If $${{Cp} \over {Cv}} = {3 \over 2}$$ for the mixture, then the value of n is :
A
1
B
3
C
2
D
3 / 2
2
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
One mole of an ideal monoatomic gas is taken along the path ABCA as show in the PV diagram. The maximum temperature attained by the gas along the path BC is given by :

A
$${{25} \over {16}}\,{{{P_o}{V_o}} \over R}$$
B
$${{25} \over {8}}\,{{{P_o}{V_o}} \over R}$$
C
$${{25} \over {4}}\,{{{P_o}{V_o}} \over R}$$
D
$${{5} \over {8}}\,{{{P_o}{V_o}} \over R}$$
3
JEE Main 2018 (Offline)
+4
-1
Two moles of an ideal monatomic gas occupies a volume V at 27oC. The gas expands adiabatically to a volume 2 V. Calculate (a) the final temperature of the gas and (b) change in its internal energy.
A
(a) 195 K (b) 2.7 kJ
B
(a) 189 K (b) 2.7 kJ
C
(a) 195 K (b) –2.7 kJ
D
(a) 189 K (b) – 2.7 kJ
4
JEE Main 2018 (Offline)
+4
-1
The mass of a hydrogen molecule is 3.32 $$\times$$ 10-27 kg. If 1023 hydrogen molecules strike, per second, a fixed wall of area 2 cm2 at an angle of 45o to the normal, and rebound elastically with a speed of 103 m/s, then the pressure on the wall is nearly:
A
2.35 $$\times$$ 103 N m-2
B
4.70 $$\times$$ 103 N m-2
C
2.35 $$\times$$ 102 N m-2
D
4.70 $$\times$$ 102 N m-2
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