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

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

what does the below rebus means?

Can you identify the famous TV character from the rebus below?

What has no start, end, or centre?

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?