Questions

It is ABACUS.

Words formed are as below 

BUS
CAB
CUB
US

An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns of a table.

A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them.

The six commonly recognised metalloids are

boron,

silicon,

germanium,

arsenic,

antimony, and

tellurium.

Full-service airline Jet Airways has announced a partnership with ride-hailing app Uber to book airport cabs through the Jet Airways app itself. The airline will partner Uber and facilitate travel from the airport once a passenger has booked a ticket on the Jet Airways app.

The first cellular phone service in india was introduced by Modi Telstra on August 23, 1995 in calcutta under the name Mobile Net. 

When a company or corporation earns a profit or surplus, that money can be put to two uses it can either be re-invested in the business called retained earnings or it can be paid to the shareholders as a dividends.

in 8085 the interrupts are classified as Hardware and Software interrupts.