What does this rebus riddle means ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Can you write down eight eights so that they add up to one thousand?

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

who is silent in the parliament?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?