When we see 2 but call 10?

What question can you never answer yes to?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

When is the top of a mountain similar to a savings account?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?