Which of the following is a wrong statement?
1
The clouds float in air due to viscosity of air
2
The presence of grease reduces the surface tension of water
3
When a number of capillary tubes of the same bore but of different materials are dipped in the same liquid, the rise of liquid in all the test tubes will be same
4
When a number of small mercury drops combine to form a single drop, there occurs a increase in the temperature of the drops