1
JEE Main 2020 (Online) 3rd September Evening Slot
Numerical
+4
-0
Out of Syllabus
If minimum possible work is done by a refrigerator in converting 100 grams of water at 0oC to ice, how much heat (in calories) is released to the surroundings at temperature 27oC (Latent heat of ice = 80 Cal/gram) to the nearest integer ?
2
JEE Main 2020 (Online) 3rd September Morning Slot
Numerical
+4
-0
A bakelite beaker has volume capacity of 500 cc at 30oC. When it is partially filled with Vm volume (at 30oC) of mercury, it is found that the unfilled volume of the beaker remains constant as temperature is varied. If $$\gamma$$(beaker) = 6 × 10–6 oC–1 and $$\gamma$$(mercury) = 1.5 × 10–4 oC–1, where $$\gamma$$ is the coefficient of volume expansion, then Vm (in cc) is close to ____.
3
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________.
4
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) _____.