Electricity — Science STD 10 — Question

Does the value of speed of light change with medium?

What is the principal function of the eye-lens?

The current passing through a room heater has been halved. What will happen to the heat produced by it?

How much work is done in moving a charge of 2C across two points having a potential difference of 12V?

State the relation between work, charge and potential difference for an electric circuit.

What is the other name for:

1. Myopia.
2. Hypermetropia.

A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?

What is the major difference between the simple alternator and most practical alternators?

What are the two ways in which you can trace the magnetic field pattern of a bar magnet?

Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.