What's the only room from which no one can enter or leave

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?

Can you place six X (crosses) in below board without making three in a row in any way ?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?