I’m tall when I’m young, and I’m short when I’m old. What am I?

What Time Should the last watch show in the below figure?

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

Can you name an animal whose killing cannot be performed without spilling your own blood?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

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

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

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?