Multiple choice general knowledge science & technology What is the approximate weight of the brain in a normal human adult? 1 pound 3 pounds 5 pounds 7 pounds Reveal answer Fill a bubble to check yourself B Correct answer Explanation The adult human brain weighs approximately 1.3-1.4 kg, which is roughly 3 pounds. Options A (1 pound), C (5 pounds), and D (7 pounds) are all incorrect - the brain is heavier than 1 pound but much lighter than 5-7 pounds.