Question : Which of the following gases is known as "laughing gas"?

Option 1: Nitrous oxide

Option 2: Nitrogen peroxide

Option 3: Nitrogen

Option 4: Nitric oxide

Question : The pair of compounds used as anaesthetic in medicines :

Option 1: Ether, Ammonia

Option 2: Nitrous oxide, Chloroform

Option 3: Chloroform, Nitrogen dioxide

Option 4: Nitrogen dioxide, Ether

Question : The chemical name of 'laughing gas' is

Option 1: Nitric Oxide

Option 2: Nitrogen Dioxide

Option 3: Nitrogen Pentaoxide

Option 4: Nitrous Oxide

Question : The large collection of stars,dust and gas held  together by gravitational attraction between components is known as

Option 1: Cluster

Option 2: Atmosphere

Option 3: galaxy 

Option 4: Sun family

Question : Bee keeping is known as:

Option 1: Sericulture

Option 2: Apiculture

Option 3: Aquaculture

Option 4: Agriculture