1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then
A
energy = 4VT $$\left( {{1 \over r} - {1 \over R}} \right)$$ is released.
B
energy = 3VT$$\left( {{1 \over r} + {1 \over R}} \right)$$ is absorbed.
C
energy = 3VT$$\left( {{1 \over r} - {1 \over R}} \right)$$ is released
D
energy is neither released nor absorbed.
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Steam at 100oC is passed into 20 g of water at 10oC. When water acquires a temperature of 80oC, the mass of water present will be
[Take specific heat of water = 1 cal g$$-$$1 oC$$-$$1 and latent heat of steam = 540 cal g$$-$$1]
A
24 g
B
31.5 g
C
42.5 g
D
22.5 g
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is

AIPMT 2014 Physics - Heat and Thermodynamics Question 68 English
A
P0V0
B
2P0V0
C
$${{{P_0}{V_0}} \over 2}$$
D
zero
4
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
The mean free path of molecules of a gas, (radius r) is inversely proportional to
A
r3
B
r2
C
r
D
$$\sqrt r $$