Study the following Venn diagram carefully. Which letter represents the hen?
I did A answer but app is telling that my answer is wrong
If it is possible to make a meaningful word with the second, fourth, sixth and eighth letters of the word UMBRELLA, then which of the following will be the third letter of that word? If more than one such word can be formed, give 'Z' as the answer. If no such word can be formed give 'X' as the answer.
When light rays move from one medium to another, they bend because of varying speeds in different mediums. What is this phenomenon called?