Questions

In which of the following countries India celebrated a cultural festival named ‘India by the Nile’ in 2017?

Russian Sukhoi 24 (SU-24) flight was shot down in November 2015 by

As per the scientists of Physics Research Laboratory, Ahmedabad which type of storm can flow towards the Earth and disturb the atmosphere?

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is half of that of earth and radius is same as that of earth is _________________.

Who was the first chairman of ISRO?

If 12x16 = 188 and 14x18 = 248, then find the value of 16x20 = ?

32% of a number exceeds 17% of the same number by 120. What is the value of the number?

Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.

Crude mineral oil comes out of the earth as a thick brown or black liquid with a strong smell. It is a complex mixture of many different substances, each with its own individual qualities. Most of them are combinations of hydrogen and carbon in varying proportions. Such hydrocarbons are also found in other forms such as bitumen, asphalt and natural gas. Mineral oil originates from the carcasses of tiny animals and from plants that live in the sea. Over million of years, these dead creatures form large deposits under sea­bed and ocean currents cover them with a blanket of sand and silt. As this material hardens, it becomes sedimentary rock and effectively shuts out the oxygen, thus preventing the complete decomposition of the marine deposits underneath. The layers of sedimentary rocks become thicker, and heavier. Their pressure produces heat, which transforms the tiny carcasses into crude oil in a process that is still going on today.

Sedimentary rocks leads to the formation of oil deposits because