What is referred to by '0 a dope'?

What is referred to by 'tree hill'? What is referred to by 'weeks in a balloon'? What is associated with: you shall find that the mystic guru nanak founded this religion in the 1500s? What is associated with: 0 0000 with a drawing of a cowboy? Based on the clue '0 degrees longitude this line passes through green...', what is the answer? Based on the clue '001 grams is equal to one of these', what is the answer? What is associated with: 002 of his 60s bestsellers were you only live twice in 1964 the man with the golden gun in 196… What is associated with: 0035 ounces?