Find the hidden tiger in the given optical illusion ?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

How many squares, of any size, can you find on this chessboard which do not contain a Rook?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What has 88 keys?

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?

Find the missing letter in the last circle logically in the given below picture.

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What can you deduce from the following BrainBat?

CRY
LMKI

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?