1) Michael investigated how temperature of water affects the speed at which sugar dissolves. What is the independent variable?  a) the type of sugar used b) the temperature of the water c) the time taken for the sugar to dissolve d) the volume of water used each time 2) Susan investigated how quick cars go down a ramp. Each time she did the experiment she changed the angle of the ramp. What was her dependent variable?  a) the car she used b) the angle of the ramp c) the surface of the ramp d) the time taken for the car to go down the ramp 3) Ellie investigated how the concentration of acid affected the rate of reaction. Which was a control variable? a) the concentration of acid b) the volume of acid c) the time taken for the reaction to happen d) the temperature of the room 4) Jacob investigated how temperature of water affects the speed at which sugar dissolves. Which of the following is a control variable?  a) the size of the sugar granules b) the time taken for the sugar to dissolve c) the type of glass the beaker is made from d) the temperature of water 5) Claire calculated the acceleration of a trolley as she added different masses to pulley. What was her independent variable? a) mass added to the pulley b) surface of the bench c) type of trolley d) acceleration 6) Oli investigated the best pH for amylase to break down starch into glucose. What was his dependent variable? a) the pH b) the concentration of starch c) the concentration of the amylase d) the time taken for the all the starch to be broken down 7) Roberto was looking at the rate at which magnesium reacted with hydrochloric acid. He wanted to find out how the concentration of acid affected the rate. What was a control variable? a) time taken for Mg to disappear b) concentration of acid c) temperature of acid d) colour of solution produced 8) Millie used a quadrat and transect to find out how the number of daisies are affected by the distance from the tree. What was her dependent variable?   a) number of daisies in the quadrant b) distance from the tree c) amount of water the daisies received d) the size of the quadrat 9) Charlie investigated how volume of hydrochloric acid affects energy change in a neutralisation reaction. What was her independent variable? a) volume of alkali used b) volume of acid used c) polystyrene cup used for reaction d) the temperature increase 10) Joe wanted to do a fair test when investigating the optimum mass of yeast to use for maximum dough rising. Which of these would be most important to have as a control variable? a) mass of yeast b) mass of flour c) maximum height of the dough d) the day he did the experiment 11) Where should the independent variable be put when drawing a graph? a) x - axis b) y-axis 12) Which variables have to be considered for a fair test? a) independent b) dependent c) control 13) Which variable is to be measured? a) independent b) dependent c) control 14) Which is the only variable to be changed? a) independent b) dependent c) control

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