I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Name a key which is hardest to turn.

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Find the hidden panda in the image below.

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

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

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?