Friction can be reduced by changing from :

The Shahnama (Book of Kings) was written by :

Ecology is the study of :

The theory that a single dominant power can maintain world peace is called :

Infrared radiations from the Sun are strongly absorbed by :

Operation Gibraltar resulted into which Indo-Pakistani War ?

World Water Day is celebrated each year on :

The latitude "AA" on the map represents the :

The United Nations (UN) International Day of Peace is celebrated on September 21 since :

Galileo's most famous invention was :

Martin Luther King Jr. was assassinated at the age of :

For purification of drinking water alum is used to :

Ozone layers absorbs most of the :

Operation Desert Shield was launched by US in :

The largest part of hydrosphere is :

The self-interest pursued by individuals causing collective destruction is called :

The Relative Humidity depends upon :

Suez canal was nationalized by Egypt in :

Which material is used to coat iron in the galvanizing process ?

Operation Enduring Freedom (OEF) was conducted by the US in :