Materials for rain-proof coats and tents owe their water-proof properties to
A). surface tension
B). viscosity
C). specific gravity
D). elasticity
surface tension
The material of rain proof coats have the property of not minimizing the surface tension which will tend the water molecule to be in its drop form.
1. The different colours of different stars are due to the variation of
2. The period of revolution of a geostationary satellite is
3. The sparkling of a diamond is due to
4. The centre of gravity of a sprinter during the race lies
5. A voltaic cell converts chemical energy to
6. the sound having a frequency of 20 hertz to 20000 hertz are known as
7. The SI unit of acceleration is _______________.
8. The word ''insolation' means
10. If the length of a simple pendulum is halved then its period of oscillation is