Why 1729 is a magic number? Answer Logically.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Remove two matchsticks to make the below equation correct.

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

What is harder to catch the faster you run?

What's the next in the series?

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