Can it be possible to build a house that has all its four walls facing towards the South?

Which tank will fill first?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What is the last thing you take off before bed?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

You can hear me, but you can't touch or see me.

What am I?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.