Find the hidden tiger in the given optical illusion ?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

Which digit occurred maximum times between the number 1 and 1000?

What does the below image rebus riddle means ?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

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