JEE Main 2019 (Online) 12th April Evening Slot | Heat and Thermodynamics Question 360 | Physics

A Carnot engine has an efficiency of $${1 \over 6}$$. When the temperature of the sink is reduced by 62ºC, its efficiency is doubled. The temperatures of the source and the sink are, respectively

99^oC, 37^oC

124^oC, 62^oC

37^oC, 99^oC

62^oC, 124^oC

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-1

A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the heat energy absorbed by the gas, in this process ?

35 J

30 J

25 J

40 J

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

-1

Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume ? (R = 8.3 J/mol K)

21.6 J/mol K

17.4 J/mol K

15.7 J/mol K

19.7 J/mol K

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

-1

When M₁ gram of ice at –10^oC (specific heat = 0.5 cal g^–1 ^oC^–1 ) is added to M₂ gram of water at 50C, finally no ice is left and the water is at 0°C. The value of latent heat of ice, in cal g^–1 is :

$${{50{M_2}} \over {{M_1}}} - 5$$

$${{50{M_2}} \over {{M_1}}}$$

$${{5{M_2}} \over {{M_1}}} - 5$$

$${{5{M_1}} \over {{M_2}}} - 50$$

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