AIPMT 2014 | Properties of Matter Question 48 | Physics

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

energy = 4VT $$\left( {{1 \over r} - {1 \over R}} \right)$$ is released.

energy = 3VT$$\left( {{1 \over r} + {1 \over R}} \right)$$ is absorbed.

energy = 3VT$$\left( {{1 \over r} - {1 \over R}} \right)$$ is released

energy is neither released nor absorbed.

AIPMT 2014

MCQ (Single Correct Answer)

-1

Steam at 100^oC is passed into 20 g of water at 10^oC. When water acquires a temperature of 80^oC, 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]

24 g

31.5 g

42.5 g

22.5 g

AIPMT 2014

MCQ (Single Correct Answer)

-1

Certain quantity of water cools from 70^oC to 60^oC in the first 5 minutes and to 54^oC in the next 5 minutes. The temperature of the surroundings is

45^oC

20^oC

42^oC

10^oC

AIPMT 2014

MCQ (Single Correct Answer)

-1

Copper of fixed volume V is drawn into wire of length $$l$$. When this wire is subjected to a constant force F, the extension produced in the wire is $$\Delta $$$$l$$. Which of the following graphs is a straight line ?

$$\Delta $$$$l$$ versus 1/$$l$$

$$\Delta $$$$l$$ versus $$l$$²

$$\Delta $$$$l$$ versus 1/$$l$$²

$$\Delta $$$$l$$ versus $$l$$

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