Identifying variables in a fair test
P4 Science · Practices of Science · 203 questions · difficulty D1–D5 · Singapore MOE-aligned
Sample questions
SAMPLE 1
A group of students wants to find out if the amount of sunlight affects how fast a plant grows. They put one plant in a sunny spot and another plant in a dark cupboard. They water both plants with the same amount of water every day. What is the independent variable in this experiment?
- A amount of sunlight
- B type of plant
- C amount of water
- D height of the plant
SAMPLE 2
A student wants to find out if the amount of sugar added to water affects how fast an ice cube melts. He uses three identical cups, each with 200 ml of water at 25°C. He adds 0, 1, and 2 teaspoons of sugar to the cups respectively. Which variable should he keep the same for a fair test?
- A the temperature of the water
- B the amount of sugar added
- C the number of ice cubes used
- D the size of the ice cubes
SAMPLE 3
A bakery wants to test which type of flour makes the fluffiest bread. They use the same amount of yeast, same kneading time, and same baking temperature for all batches, but they vary the flour type. Which is the independent variable in this experiment?
- A type of flour
- B amount of yeast
- C kneading time
- D baking temperature
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