Questions

In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.
An old unmarried woman

What happens in an oxidation reaction?

Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. Ifa sentence is free from error, select 'No Error'.

Buddhism originated in Ancient India around 6th and 4th (1)/ centuries BCE, from where it spread through most (2)/ of Asia, and then it declines in India during the Middle Ages. (3)/ No error (4)

Select the word with the correct spelling.

Geneva-based International Campaign to Abolish Nuclear Weapons (ICAN) received the 2017.....

The percentage change of a number when it is first decreased by 10% and then increased by 10% is

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