Questions

The washing machine works on the principle of ____________

The most productive ecosystem in the biosphere is

_____________________ states that the total current entering a junction is equal to the total current leaving the junction.

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

INTANGIBLE

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

Zip your lip

Improve the bracketed part of the sentence.
Would it be impolite (to be asked) why they are leaving?

Out of the four alternatives, choose the one which can be substituted for the given words/sentences and click the button corresponding to it.

A notice of a person's death

Select the word with the correct spelling.