1
WB JEE 2020
+2
-0.5
A metallic block of mass 20 kg is dragged with a uniform velocity of 0.5 ms-1 on a horizontal table for 2.1 s. The coefficient of static friction between the block and the table is 0.10. What will be the maximum possible rise in temperature of the metal block, if the specific heat of the block is 0.1 CGS unit? Assume g = 10 ms-2 and uniform rise in temperature throughout the whole block. [Ignore absorption of heat by the table]
A
0.0025$$^\circ$$ C
B
0.025$$^\circ$$ C
C
0.001$$^\circ$$ C
D
0.05$$^\circ$$ C
2
WB JEE 2019
+1
-0.25
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
+1
-0.25
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
+1
-0.25
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?

A
T
B
$${T \over 2}$$
C
2T
D
$${T \over 4}$$
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