P-1 Heat — Science STD 10 — Question

Why does aluminium not corrode right through?

In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.

Give the names and structural formulae of one saturated cyclic hydrocarbon and one unsaturated cyclic hydrocarbon.

State the period to which the above elements belong.

If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?

In addition to sodium hydrogencarbonate, baking powders contain a substance X. Name the substance X. What is the role of substance X in the baking powder?

Explain what is meant by a virtual, magnified image.

Explain why, concave mirrors are used as shaving mirrors.

Draw a diagram to show the magnetic field lines around a bar magnet.

You have to use free space around your home for good purpose.What will you do? Why?