Questions

A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world. Scientific theories are not ever proved in the sense of being proved to be 100% correct.

Examples of some scientific theories are ::

Evolution, gravity, atomic theory, the germ theory of disease, relativity, quantum theory, electromagnetic theory, layered Earth theory, etc...

Demat means Dematerialisation of share, in simple it is an account with which a person can trade in security market without which a person cannot buy or sell any share in security market. 

Citric acid is present in tomatoes.

The PS command prints the process status for some or all of the running processes

Six sigma is a data-driven technique and way for eliminating defects in any progress from product to service and from manufacturing to transactional.

Product formation : It can be defined as putting different products and services together to form a product for the satisfaction of customer. For e.g. Hospitality is a product formation which is not made from a single item. 

Service brigade : Team of staffs involved in providing service

The Moment of Truth: It is the actual time when customer interacts with service staff. It is the moment of contact when no management has control. It is the motivation, skill, tools of the service and expectation, behavior, expectation of the customer determines the quality of the service.