What is at the end of a rainbow?

No matter how little or how much you use me, you change me every month. What am I?

Two friends Smith and Andrew were talking about the bravery of their families. Smith told great stories about his courageous grandfather who fought for Britain in "World War I". Andrew told that his grandfather was so brave that in 1919 just after the war he was honoured with a bravery medal with the words "For our Courageous Soldiers In World War I" embedded into it. Smith knows that his friend is lying. How?

How many letters are in the alphabet?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

Can you identify the Oscar-winning movie from the rebus below?

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

what does the below rebus means?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?