Who gave the theory of scientific socialism?

When did the Union of Soviet Socialist Republics come into existence?

In which year did the Russian Revolution begin?

Name the e-Krishi Spot Market Platform launched by BSE for agricultural commodities?

Which of the following trains runs on the longest rail route in the country?

Which is the oldest Puran steam engine in the world so far used?

Which state of India has the highest rail line?

When did the first rail run in the world?