Chemical Reactions and Equations — Science STD 10 — Question

What is ‘dispersion of white light’? State its cause. Draw a ray diagram to show the dispersion of white light by a glass prism.

1. Draw a diagram to show the formation of image of a distant object by a myopic eye. How can such an eye defect be remedied?
2. State two reasons due to which this eye defect may be caused.
3. A person with a myopic eye cannot see objects beyond a distance of 1.5 m. What would be the power of the corrective lens used to restore proper vision?

Name five places in India where nuclear power plants are located.

Food does not pass through the digestive system by 'gravity'. This is clear from the fact that we can digest the food even if we are lying down. Explain the logic behind the passage of food through our digestive system.

Describe how petroleum was formed in the earth.

List three distinguishing features, in tabular form, between acquired traits and the inherited traits.

1. Explain the process of regeneration in Planaria.
2. How is regeneration different from reproduction?

What is a ‘food web’? Show its formation.

The image of a candle flame placed at a distance of 45 cm from aspherical lens is formed on screen placed at a distance of 90 cm from the lens. Identify the type of lens and calculate its focal length If the height of the flames 2cm, find the height of its image.

A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:

1. The N-pole is removed?
2. The S-pole is inserted?
3. The magnet is a rest in the coil?