Questions

Improve the bracketed part of the sentence.
She is not used (to sleep) for so long.

A machine depreciates in value each year at the rate of 10% of its previous value. However, every second year there is some maintenance work so that in that particular year, depreciation is only 5% of its previous value. If at the end of the fourth year, the value of the machine stands at Rs 1,46,205, then find the value of machine at the start of the first year.

Which dynasty was ruling in Vijaynagar empire at the time of the Battle of Talikota?

Which Freedom Fighter addressed Mahatma Gandhi as "Father of the Nation" for the 1st time?

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.

Once and for all

In the following question, four words are given out of which one word is correctly spelt. Select the correctly spelt word.

In the following question, out of the given four alternatives, select the one which is opposite in meaning of the given word.

Relationship

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