I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

A cat, a dog and a monkey were stolen. 3 suspects got caught: Harish, Manoj and Tarun. All we know is each person stole one animal, but we do not know who stole which. Here are the investigation statements. Harish said: Tarun stole the cat. Manoj said: Tarun stole the dog. Tarun said: They both were lying. I did not steal the cat or the dog. Later on, the police found out the man who stole the monkey told a lie. The man who stole the cat told the truth. Can you find out who stole which?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Can you find out which options fits best with the missing column?

How is the moon similar to a dollar?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

If an electric train is travelling south, then which way is the smoke going?