1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A small spherical body of radius r and density $$\rho $$ moves with the terminal velocity v in a fluid of coefficient of viscosity $$\eta $$ and density $$\sigma$$. What will be the net force on the body?
A
$${{4\pi } \over 3}{r^3}(\rho - \sigma )$$
B
6$$\pi $$$$\eta $$rv
C
Zero
D
Infinity
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Two black bodies A and B have equal surface areas are maintained at temperatures 27$$^\circ$$C and 177$$^\circ$$C respectively. What will be the ratio of the thermal energy radiated per second by A to that by B?
A
4 : 9
B
2 : 3
C
16 : 81
D
27 : 177
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
What will be the molar specific heat at constant volume of an ideal gas consisting of rigid diatomic molecules?
A
$${3 \over 2}R$$
B
$${5 \over 2}R$$
C
R
D
3R
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Consider the given diagram. An ideal gas is contained in a chamber (left) of volume V and is at an absolute temperature T. It is allowed to rush freely into the right chamber of volume V which is initially vacuum. The whole system is thermally isolated. What will be the final temperature of the equilibrium has been attained?

WB JEE 2019 Physics - Heat and Thermodynamics Question 32 English
A
T
B
$${T \over 2}$$
C
2T
D
$${T \over 4}$$
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