Questions

The alphabet 'Y' resembles same as the questioning word WHY in sounding.

Hence,  alphabet Y is a question.

Distributed systems work in a network. They can share the network resources,communicate with each other.

A colon is used to connect two sentences when the second sentence expands, illustrates, explains, summarizes, or sharpens the first. Both sentences should be complete, and their content should be very closely related.

Example:

This girl has two favorite hobbies: watching movies and seeing how long she can hold her breathe.

The current Union Minister of Railways in India 2019 is Piyush Goyal. He is also holding the Ministry of Finance for temporary.

On election day, voters for The President are really voting for the electors who can elect President.

Allotropes are different structural modifications of an element, that is, each of two or more different physical forms in which an element can exist.

Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include charcoal, diamond, graphite, buckminsterfullerene and graphene.

Hence, Ethylene is not an allotrope of Carbon.