____ is a colourless and odourless gas which is used in making light bulbs.
Which among the following is not a layer of the atmosphere?
In which layer of atmosphere most of the ozone is present, which protects us from harmful UV radiations of sun?
Which among the following is not a property of air?
___ holds the layer of air around the earth.
Which among the following is not a process of removing insoluble impurities from water?
A process, in which alum is added to muddy water to separate suspended din particles.
Crystals are used to kill germs present in water.
Name the process in which clean water is poured into another container without disturbing the sediments.
Which among the following is incorrect for the nitrogen gas?
Humidity means amount of ____ in the air.
Which among the following involves chemical treatment for water purification?
Name the low-lying areas that is filled by solid waste material.
Which among the following is a green house gas?
IS, Bronchitis is caused by;
____ is used in refrigerators, air conditioners and in many other industrial processes.
Soluble impurities can be removed by which of the following processes?
Name the gas released by grass-eating animals as their waste product.
Which among the following is caused by polluted water?
Which among the following is an effect of global warming?