Which is the smallest number that you can write using all the vowels exactly once?

What does below chemistry rebus means?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

Count the number of squares in the picture below.

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.

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

Why is 6 afraid of 7?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?