3 13100.03 Question 1 Requirements • plastic measuring cylinder capacity 250 ml • 2 × 500 ml beaker • 30 cm ruler reading to 0.1 cm • 2 mm drill bit and drill • sink or basin to collect water • stopclock reading to 0.01 s • vernier caliper • adhesive tape • red food colouring Preparation Drill a single 2 mm diameter hole in the measuring cylinder level with the 30 ml marking on the cylinder. Tape the ruler vertically to the outside of the measuring cylinder so that the 0 cm marking on the ruler is horizontally level with the centre of the hole as shown in Fig. 1.1. ruler hole Fig. 1.1 Place the measuring cylinder so that when fi lled the water drains into a basin/sink. Fill two 500 ml beakers with approx. 350ml of water and add a few drops of food colouring to make it easier to determine the level of water when in the measuring cylinder. Please note, spare beakers of coloured water should be available in case candidates do a trial run or wish to repeat a run. Place the stopwatch and vernier caliper next to the measuring cylinder. Action at changeover Empty the measuring cylinder, reset the stopclock, close the vernier caliper and refi ll the beaker with water and drops of food colouring. 0 cm measuring cylinder