Our Environment — Science STD 10 — Question

Why is sodium kept immersed in kerosene oil?

Of what substance is the core of the coil of an electric motor made?

What name is given to the heat energy obtained from hot rocks inside the earth?

How will you find out which of the water soluble compound A or B is ionic?

An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?

The graph between V and 1 for a conductor is a straight line passing through the origin.
Which law is illustrated by such a graph?
What should remain constant in a statement of this law?

If a woman is using a copper-T will it help in protecting her from sexually transmitted diseases?

What are the criteria you would consider when trying to categorise something as a good fuel?

What condition is necessary for the production of current by electromagnetic induction?