Light: Mirrors and Lenses — Science STD 8 — Question

What is meant by ‘combustion’? Explain with an example.

Name the microorganisms which can fix atmospheric nitrogen in the soil.

Explain why, when an object is placed between two plane mirrors inclined at an angle, then multiple images are formed.

Are some metals more suitable for electromagnets than others?

Explain how, the use of pesticides in agriculture causes water pollution.

A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.

What change in the voice of body takes place when they reach puberty? What is the cause of this change?

Does any part of our body vibrate when we speak? Name the part.

Where do Rhizobium bacteria live? What is their function?

What is the angle of incidence when a ray of light is incident normally on a plane mirror?