1
JEE Main 2020 (Online) 2nd September Morning Slot
Numerical
+4
-0
An engine takes in 5 moles of air at 20oC and 1 atm, and compresses it adiabatically to 1/10th of the original volume. Assuming air to be a diatomic ideal gas made up of rigid molecules, the change in its internal energy during this process comes out to be X kJ. The value of X to the nearest integer is________.
2
JEE Main 2020 (Online) 9th January Evening Slot
Numerical
+4
-0
Starting at temperature 300 K, one mole of an
ideal diatomic gas ($$\gamma$$ = 1.4) is first compressed
adiabatically from volume V1 to V2 = $${{{V_1}} \over {16}}$$. It is
then allowed to expand isobarically to volume 2V2. If all the processes are the quasi-static then
the final temperature of the gas (in oK) is (to the nearest integer) _____.
3
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
Three containers C1, C2 and C3 have water at different temperatures. The table below shows the final temperature T when different amounts of water (given in litres) are taken from each containers and mixed (assume no loss of heat during the process) The value of $$\theta$$ (in °C to the nearest integer) is ..........
4
JEE Main 2020 (Online) 7th January Evening Slot
Numerical
+4
-0
M grams of steam at 100oC is mixed with 200 g of ice at its melting point in a thermally insulated container. If it produced liquid water at 40oC [heat of vaporization of water is 540 cal/g and heat of fusion of ice is 80 cal/g] the value of M is ____
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