The most common carrier gas employed in gas chromatography is

In mould board plough, Soft Centred stell is in used for making of . . . . . . . .

A. Frog

B. Mould Board

C. Land Side

D. None of these

The pressure drop across a fluidised bed will depend upon

A. Depth of bed

B. Porosity of the bed

C. Density of the particles

D. All of the above

Functions of seed cum fertiliser drill

A. To carry the seeds and fertiliser in separate compartments

B. To open furrows at uniform depth

C. To cover the seed and fertiliser

D. All of the above

Seed drill have slip equals to

A. Zero

B. Positive slip

C. Negative slip

D. None of these