Questions

Fear of places and situations that might cause panic, helplessness or embarrassment is called Agoraphobia. 

Fear of crossing road causes some panic in them and comes under Agoraphobia.

A greenhouse gas is a gas in an atmosphere that absorbs and emits radiant energy within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. 

Carbon dioxide is a main greenhouse gas, found in car exhaust pipes.
Methane and nitrous oxide is another type of greenhouse gas.

Oxygen is the only clean gas out there because we need it to survive. Therefore, the only gas that is not a greenhouse gas is Oxygen.

Sea appears blue in colour due to the scattering of the rays when they hit water molecules

Sir Benegal Narsing Rao (B N Rau), was the Constitutional Advisor to the Constituent Assembly. He was an Indian civil servant, jurist, diplomat and statesman known for his key role in drafting the Constitution of India.

He was also India's representative to the United Nations Security Council from 1950 to 1952.

Peru is a country in South America. Lima is the capital city of Peru. Sol is the currency of Peru.

First Generation  Vacuum Tubes (1940-1956)

The first computer systems used vacuum tubes for circuitry and magnetic drums for memory