Questions

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.

The time taken for the marine deposits to harden into rocks is

In the following question, out of the four alternatives, choose the word which best expresses the meaning of the given word and click the button corresponding to it.
ADAPT

Thorn Forests are found in ..........

All atoms of the same element have the same

The sentences given with blanks are to be filled with an appropriate word(s). Four alternatives are suggested for each question. For each question, choose the correct alternative and click the button corresponding to it.

I have decided _____ my course of action.

Improve the bracketed part of the sentence.
Once you emerge as an individual, it is important to realise that your freedom has an impact (on) others.

Four statements are given below at A, B, C and D. There may be some errors in the given statement(s). The incorrect statement is your answer.

A change in which one or more new substances are formed is called _________.