Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

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

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I have no life, but I can die. What am I?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?