What is so fragile that saying its name breaks it?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

What runs around the whole yard without moving?

Readers with the most attentive eyes can find three differences between the crocodile pictures in 10 seconds. Can you? Test your attentiveness now!

Why do we preferably have round manhole covers and not square ones?

Below rebus represent famous DiCaprio movie. Can you name it?

What work can one never finish?

Why do people go to bed?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?