JEE Main 2018 (Online) 16th April Morning Slot | Heat and Thermodynamics Question 249 | Physics

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-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 :

3 / 2

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-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 :

JEE Main 2018 (Online) 16th April Morning Slot Physics - Heat and Thermodynamics Question 257 English

JEE Main 2018 (Online) 16th April Morning Slot Physics - Heat and Thermodynamics Question 257 English

$${{25} \over {16}}\,{{{P_o}{V_o}} \over R}$$

$${{25} \over {8}}\,{{{P_o}{V_o}} \over R}$$

$${{25} \over {4}}\,{{{P_o}{V_o}} \over R}$$

$${{5} \over {8}}\,{{{P_o}{V_o}} \over R}$$

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

-1

Two moles of an ideal monatomic gas occupies a volume V at 27^oC. 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) 195 K (b) 2.7 kJ

(a) 189 K (b) 2.7 kJ

(a) 195 K (b) –2.7 kJ

(a) 189 K (b) – 2.7 kJ

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

-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 45^o to the normal, and rebound elastically with a speed of 10³ m/s, then the pressure on the wall is nearly:

2.35 $$\times$$ 10³ N m^-2

4.70 $$\times$$ 10³ N m^-2

2.35 $$\times$$ 10² N m^-2

4.70 $$\times$$ 10² N m^-2

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