What color was George Washington's white horse"
Grey or albino, you cannot register a horse as "white".
Who was buried in Grant's tomb?
Grant. And his wife.
Which is heavier? A pound of feathers or a pound of gold?
A pound of feathers. Gold has only 12 ounces per pound. (Troy weight)
Which is heavier? An ounce of gold or an ounce of feathers?
An ounce of gold. Gold is measured in Troy ounces which are about 10% heavier than standard ounces.
Nobody is buried in Grant's Tomb. Mr. & Mrs. Grant are entombed there. If they were buried, the monument would be called Grant's Grave.