Answer:
1. False; Pouring water on burning grease or oil will not extinguish the fire. It will only cause the burning oil to splash, spreading the grease fire around.
2. False; Pounding a person on the back does nothing more then knock what little air they may have inside of them out and lodge whatever they're choking on deeper.
3) True; The brain is extremely sensitive to lack of oxygen and begins to die within 4 to 6 minutes. So during choking incident one must act very fast during this time.