If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What occurs twice in a week, once in a year but never in a day?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

A man was telling some of his war stories to his grandchildren.
"When the World War I was on the verge of end, I was awarded for my bravery for I had saved a group of my men." He coughed and then added, "When we were fighting in northern France, an enemy soldier threw a grenade at us. Before it could explode, I picked it up and threw it away. For my act of bravery, right before the war ended, A General gave me a sword engraved with the words "Awarded for Display of Bravery and Heroism in World War 1"."

Hearing this, one of the grandson spoke up. "Grandpa, this is not a true story. It can"t be true!"

The truth is that it was not. How did the grand children know it?

What does below Rebus say?

XLR8

Who always enjoys poor health?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What does this mean?

CCCCCCC

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?