What word begins and ends with an E, but has only one letter?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

There is something which you can be arrested for attempting but not for successfully completing.

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

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

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

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?