Gold futures fell during electronic trading this Thursday after Ben Bernanke's, U.S. Federal Reserve Chairman, testimony to the Congress. Gold prices for August delivery tumbled $12.10, a 0.7 per cent decrease, to $1,622.10 an ounce in trading session of the New York Mercantile Exchange's Comex division. Silver futures for July delivery slipped 29 cents, a 1 per cent decline, to $29.20 an ounce.