Questions

When iron is exposed to moist air, a reddish brown coating of hydrated Iron (III) Oxide (Fe2O3) is deposited on its surface. This reddish brown coating is called

Piano was invented by ________.

The value of cos220° + cos270°is

If sec -7π/4 = x, then the value of x is

What is the altitude of an equilateral triangle whose side is 12 cm?

'Parsec' is the unit measurement of

_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.

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.

To emend a piece of writing means to remove mistakes from it.