Sound — Science STD 8 — Question

An electric spark is struck between two electrodes placed near each other in a closed tank full of petrol. Will the petrol catch fire? Explain your answer.

Name two animals which produce embryos that grow into larvae before transforming into adults.

Name two metals which are usually electroplated on cheaper metals for making jewelry (or ornaments).

What sort of cells do not have a cell wall around them?

A small device pulls iron nails from a distance. Which type of force is involved in this process?

State whether human beings reproduce by sexual method of asexual method.

What is the loudness of a normal conversation in decibels?

Name two domestic animals which are used to obtained milk.

Which effect of electric current is utilized when a thin layer of chromium metal is deposited on an iron tap? What is this process known as?

Which of the two is a thermosetting plastic: PVC or bakelite?