P-1 Chemical reactions and equations — Science STD 10 — Question

Fill in the following blanks with suitable words:
A motor contains a kind of switch called a _________ which reverses the current every half _________

A galvanometer is a sensitive device which works on the same principle as that of an ………… .

Fill in the following blanks with suitable words:
Rose plants and sugar cane crop are usually grown by the _________ method.

Energy from food is obtained in the form of _________ .

The two main methods of reproduction are_________and_________.

The refractive index of air goes on __________ while coming to the earth surface.

The SI unit of heat energy is ………… .

Mixture of bacterial strains like ………… andm ………… is mixed with ethanol for its microbial degradation.

………… chemicals are mixed with the soil due to use of chemical pesticides in agriculture.

The science and technology regarding the extraction of metals from ores and their purification for the use is called __________.