Which number should replace the question mark?

What does this rebus mean?

O
N
C
E
TIME

John was piloting a plane behind a car but was never able to overtake it. Why?

A tourist visits a small town for his research. While in the town, he decides to get a haircut. Since the town is quite small, there are only two barbers in the town � one on the North Street and one on the South Street. The barbershop on the North Street is a mess and the barber has a weird and pathetic haircut. While the barbershop at the South Street is pretty tidy and the barber as well has an impressive haircut.

Which barbershop will the tourist visit for his haircut and why?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

Can you name four days which start with the letter 'T'?

Can you count the number of blocks in the picture below?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

What has many keys but can’t open a single lock?

Find out the number of circles in the given picture having Illusion