What occurs twice in a week, once in a year but never in a day?

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

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

Which wheel of car does not rotate when you turn your car right?

How many times do a clock's hands overlap in a day ?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

What number should come in place of the question mark below?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.