When monkey rotate the gear, which mark will be hit 1 or 2 ?

Before Mount Everest was discovered, what was the highest mountain in the world?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.