The Human Eyes And The Colourful World — Science STD 10 — Question

In Activity 13.7, how do we think the displacement of rod AB will be affected if

1. Current in rod AB is increased;
2. A stronger horse-shoe magnet is used; and,
3. Length of the rod AB is increased?

What is a nuclear reactor? What is the fuel used in a nuclear reactor?

What is the shape of field lines inside a current-carrying solenoid? What does the pattern of field lines inside a current-carrying solenoid indicate?

Describe with the help of a diagram, the nature, size and position of the image formed when an object is placed beyond the centre of curvature of a concave mirror.

Give one example to show how the resistance depends on the nature of material of the conductor.

Water in deep sea is blue in colour. Why?

Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it.

Refractive indices of four media A, B, C and D are given below:

Medium	Refractive index
A B C D	1.33 1.44 1.52 1.65

In which of these four media is the speed of light:

1. Maximum, and
2. Minimum?

An object is placed at a distance of 12cm in front of a concave mirror of radius of curvature 30cm. List four characteristics of the image formed by the mirror.

Describe with a suitable diagram, how a convex mirror diverges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of convex mirror in this diagram.