My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

What is more useful when it is broken?

I drive at an average speed of 30 miles per hour to the railroad station each morning and catch my train. On a particular morning, there was a lot of traffic and at the halfway point, I had averaged only 15 miles per hour. How fast must I drive for the rest of the way to catch my train?

What does the below rebus puzzle mean?

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

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

what does this below rebus represent identXQQQQQME

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?