Questions

Earth revolves around Sun. Who was the 1st one to present this theory?

______ is the time taken by the earth to return to a given point in its orbit with reference to a fixed star.

Air pollution level is considered to be moderate if Air Quality index between

The phenomenon of change in direction of light when it passes from one medium to another is called

A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?

In the following question, a sentence / a part of sentence is underlined. Below are given alternatives to the underlined part which may improve the sentence. Choose the correct alternative. In case no improvement is required, choose "No Improvement" option.

He spoke as though his throat had had suffered an injury.

The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.
Now the first and most
X-strata of marine origin occur above the
Y-simple appearance is where
Z-level of the sea in horizontal position

In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one which best expresses the same sentence in Passive/Active voice.

I shall have written the full thesis by December.