1) Which of these objects is the coldest? a) Ice b) Water 2) Which of these is the brightest? a) Light bulb b) The Sun 3) Which of these is the best electrical conductor? a) Iron b) Gold c) Silver 4) Which one is the best thermal insulator? a) Ceramic b) Iron 5) Which one is the heaviest? a) Blue whale b) Shark 6) Which one is the fastest a) Airplane b) Car c) Train

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