1
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A container AB in the shape of a rectangular parallelopiped of length 5 m is divided internally by a movable partition P as shown in the figure.

WB JEE 2020 Physics - Heat and Thermodynamics Question 34 English
The left compartment is filled with a given mass of an ideal gas of molar mass 32 while the right compartment is filled with an equal mass of another ideal gas of molar mass 18 at same temperature. What will be the distance of P from the left wall A when equilibrium is established?
A
2.5 m
B
1.8 m
C
3.2 m
D
2.1 m
2
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
When 100 g of boiling water at 100$$^\circ $$ C is added into a calorimeter containing 300 g of cold water at 10$$^\circ $$ C, temperature of the mixture becomes 20$$^\circ $$ C. Then, a metallic block of mass 1 kg at 10$$^\circ $$ C is dipped into the mixture in the calorimeter. After reaching thermal equilibrium, the final temperature becomes 19$$^\circ $$ C. What is the specific heat of the metal in CGS unit?
A
0.01
B
0.3
C
0.09
D
0.1
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
As shown in the figure, a point charge q1 = + 1 $$ \times $$ 10-6 C is placed at the origin in xy-plane and another point charge q2 = + 3 $$ \times $$ 10-6 C is placed at the coordinate (10, 0).

WB JEE 2020 Physics - Electrostatics Question 30 English
In that case, which of the following graph(s) shows most correctly the electric field vector in Ex in x-direction?
A
WB JEE 2020 Physics - Electrostatics Question 30 English Option 1
B
WB JEE 2020 Physics - Electrostatics Question 30 English Option 2
C
WB JEE 2020 Physics - Electrostatics Question 30 English Option 3
D
WB JEE 2020 Physics - Electrostatics Question 30 English Option 4
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Four identical point masses, each of mass m and carrying charge + q are placed at the corners of a square of sides a on a frictionless plane surface. If the particles are released simultaneously, the kinetic energy of the system when they are infinitely far apart is
A
$${{{q^2}} \over a}(2\sqrt 2 + 1)$$
B
$${{{q^2}} \over a}(\sqrt 2 + 2)$$
C
$${{{q^2}} \over a}(\sqrt 2 + 4)$$
D
$${{{q^2}} \over a}(\sqrt 2 + 1)$$
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