A]Exploring and Managing Raster data: Adding raster layers, raster styling and analysis, raster 
mosaicking and clipping
Ans)
Adding Raster layers

Add raster layer throw layers -> add Layer -> Add raster layer

Give the file of population here in raster dataset

OUTPUT

Go to property window in the layers of each layer

In here change render type to singleband pseudocolor and set max to 240 With it choose a color to apply throw color ramp

OUTPUT

Go to raster calculator in raster

Then give a name to output layer then in raster calculator expression layer2 – layer1 and then make sure checkbox is ticked of add result to project and then click ok

Then you will get Output

Then go to its properties window by right clicking the layer

Then chose render type singleband pseudocolor and interpolation to discrete and choose your colors for no data, negative, positive and netural

OUTPUT:

Raster mosaicking and clipping

go to layer then add layer and add raster layer

Then add the file throw raster dataset all .TLF files

Then you will get this output

Then go to Raster -> miscellaneous -> merge 

Then you will get this window , add the input layers 

Then select all TIF Files and Click Run

The Output After Run

Here we now add layer-> add layer-> add vector layer (TO add the map of india admo.shp)
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Select the file from vector dataset(.shp file)

Then you will get this output

Then go to properties and then click on simple fill then go to fill style and choose no brush 

Then apply it and you will get this output 

Then Go to raster -> Extraction -> clip Raster by Mask Layer

Then in Input layer select the merged[EPSG:4326]

Then click run and you will get this output