-Study about the air, atmosphere, properties of air, water, removing impurities from water by physical, biological and chemical methods.Read More...
Essential for Life - Air & Water Worksheet-1
(A) Earth’s gravity (B) Moon’ gravity (C) Sun’s gravity
(A) 25% (B) 20% (C) 21%
Essential for Life - Air & Water Worksheet-3
(A) Oxygen (B) Nitrogen (C) Hydrogen
(A) Hydrogen (B) Carbon dioxide (C) Helium
Essential for Life - Air & Water Worksheet-4
a. Graphite is used in making light bulbs and fluorescent tubes.
b. Air is a mixture of several gases.
c. The rate of evaporation is faster in winter as compared to summer.
d. It is very easy to separate soluble impurities from the solution as compared to insoluble impurities.
e. Boiling the drinking water for 30 seconds can kill the germs and make it germ free.
f. The rate of evaporation decreases with increase in temperature.Read More...