Questions

Which determines the frequency of a sound wave?

Instrument for measuring light intensity is called

In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement". 
 
she thought she (have rediscovered) her real self after a long time

Process of gaining electrons is known as _____.

In the following question, a word has been written in four different ways out of which only one is correctly spelt. Select the correctly spelt word.

Improve the bracketed part of the sentence.
The exhausted travellers seemed relieved when the train finally (came into) the station.

The term racial unconscious means that

In the following question, out of the given four alternatives, select the alternative which best expresses the meaning of the Idiom/Phrase.

To bid defiance