Which one among the following fuels is used for gas welding?

Consider the contour plot given below

The above contour features in an area indicateseveral relief features.Which one among the following is not depicted here?

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