Who discovered electricity and invented the lightning rod and bifocals?

____________ scheme by the Central Government states that an insurance of 10 lakhs will cover each passenger traveling by Indian Rail while booking a ticket if an amount of 92paise is paid.

_____________ is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.

The property of metals by which they can be beaten into thin sheets is called _______________.

A change in which one or more new substances are formed is called _________.

Using _________ one can resize, tag digital images, organise pictures into albums by drag and drop, can export the pictures for external use (by e-mail or print).

The frictional force exerted by fluids is also called ________.

Convex and concave mirrors are examples of?