In the human digestive system,digestion starts in the

Electricity is produced through dry cell from

A metallic plate sticks firmly on the mouth of a water vessel made from another metal.By the way of heating,one can detach the plate from the vessel.This is because heat expands

Arrange the following layers of atmosphere vertivally from the surface of the earth

1.Mesosphere

2.Troposphere

3.Stratosphere

4.Thermosphere

Which among the following is not true for mammals?

Which one among the following compounds have the same equivalent weight and molecular weight?