Questions

The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all rows from all tables fitting your query specifics and combines them into a table. A UNION statement effectively does a SELECT DISTINCT on the results set.

India is the 2nd largest importer of weapons in the world, as per 'Trends in International Arms Transfers 2018.

Water possess intermolecular hydrogen bonding in the condensed phase.

Hence, the given statement 'There is extensive intramolecular hydrogen bonding in the condensed phase.' about water is FALSE.

The substances in which two or more atoms are attached together are called as molecular substances. 

Properties of molecular substances ::

1. Molecular substances are bonded with covalent bonds

2. Bad heat conductivity

3. Bad electrical conductivity

4. Have low melting points.

Aldosterone is a steroid hormone that is produced in the adrenal gland. It is useful and more essential for the conservation of sodium content in the kidney, salivary glands, colon and sweat glands.

Here, Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule is the only option that is NOT correct about aldosterone.

A search engine is a set of programs which enables users to search documents and files ihe world wide web.

Common search engines are Google, Yahoo, Bing,...