What's the only room from which no one can enter or leave

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

Which of the below owl is odd one out?

What does below chemistry rebus means?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?