I am white when I am dirty, and black when I am clean. What am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Which point will the car reach to go out?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

What jumps when it walks and sits when it stands?

Before Mount Everest was discovered, what was the highest mountain in the world?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

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?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.