1
AIPMT 2014
+4
-1
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
+4
-1
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
+4
-1
Certain quantity of water cools from 70oC to 60oC in the first 5 minutes and to 54oC in the next 5 minutes. The temperature of the surroundings is
A
45oC
B
20oC
C
42oC
D
10oC
4
NEET 2013 (Karnataka)
+4
-1
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2, respectively. If the rate of heat conduction in 1 is four times that in 2, then
A
K1A1 = 4K2A2
B
K1A1 = 2K2A2
C
4K1A1 = K2A2
D
K1A1 = K2A2
EXAM MAP
Medical
NEET