Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

Before Mount Everest was discovered, what was the highest mountain in the world?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

What always comes into a house through the keyhole?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

Which letter of the alphabet has the most water?