1
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
The specific heat of water
= 4200 J kg-1K-1 and the latent heat of
ice = 3.4 $$\times$$ 105 J kg–1. 100 grams of ice at
0oC is placed in 200 g of water at 25oC. The
amount of ice that will melt as the temperature
of water reaches 0oC is close to (in grams) :
A
63.8
B
61.7
C
69.3
D
64.6
2
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
Match the $${{{C_P}} \over {{C_V}}}$$ ratio for ideal gases with different type of molecules :

Molecule Type CP/CV
(A) Monatomic (I) 7/5
(B) Diatomic rigid molecules (II) 9/7
(C) Diatomic non-rigid molecules (III) 4/3
(D) Triatomic rigid molecules (IV) 5/3
A
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
B
(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
C
(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
D
(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
3
JEE Main 2020 (Online) 3rd September Evening Slot
+4
-1
A metallic sphere cools from 50oC to 40o in 300 s. If atmospheric temperature around is 20oC, then the sphere’s temperature after the next 5 minutes will be close to :
A
35oC
B
31oC
C
33oC
D
28oC
4
JEE Main 2020 (Online) 3rd September Evening Slot
+4
-1
To raise the temperature of a certain mass of gas by 50oC at a constant pressure, 160 calories of heat is required. When the same mass of gas is cooled by 100oC at constant volume, 240 calories of heat is released. How many degrees of freedom does each molecule of this gas have (assume gas to be ideal)?
A
6
B
7
C
5
D
3
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