Friction — Science STD 8 — Question

Name the organs which produces sperms in humans.

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Name one non-metal used for making fertilisers.

How are microorganisms used in the food industry?

Sometimes we see that the liquid is conducting but the bulb may not glow. Why?

Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).

Zinc is not plated on iron. Is it correct?

Where do we apply a force while walking ?

When a parallel beam of light hits an uneven surface, then predict the nature of reflected beam.