Plan a fair experiment

Grade 6 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   What is changed, drop height: 50, 100, 150 cm; what is measured, blank. Bo drops a ball from 50, 100 and 150 cm and measures how high it bounces. What is the dependent variable?

   • The kind of ball, kept the same
   • How high the ball bounces
   • The number of people watching the drop
   • The drop height of the ball
2. 2.

   Kira times how long sugar takes to dissolve in cold and in warm circle water. Which pair names the variables correctly?

   • Changed: water temperature; measured: time to dissolve
   • Changed: amount of sugar; measured: water temperature
   • Changed: the glass; measured: the spoon
   • Changed: time to dissolve; measured: water temperature
3. 3.

   “Investigation card:” Jun tests three paper-towel brands to see which soaks up the most water. What must stay the same?

   • The water amount and the towel size
   • The amount of water each towel soaks up
   • The brand of paper towel
   • Nothing; any amounts will do
4. 4.

   Luz tests whether salt makes ice cubes melt faster. Which plan is fair?

   • Test one plate of salted cubes and nothing else
   • Salted cubes in the sun; plain cubes in the cool shade
   • Same-size cubes in the same room, salt on one plate
   • Big cubes get salt; small cubes get no salt
5. 5.

   Investigation card: what is changed, magnet A or B; what is measured, paper clips picked up. Milo compares two magnets by counting how many paper clips each picks up. Which choice would make the test unfair?

   • Counting the clips the same way each time
   • Testing both magnets on the same table
   • Using bigger paper clips for one magnet
   • Using the same box of paper clips for both
6. 6.

   Question, Does light change plant height?; hypothesis, blank. Which is a testable hypothesis for Noah's plant-and-light experiment?

   • Will the plants grow?
   • Plants are the nicest living things to see in a garden
   • Plants like light because it makes them happy
   • If a plant gets more light, then it will grow taller
7. 7.

   Which hypothesis can Pia test with a ball and a meter stick?

   • If the drop height is greater, the ball will bounce higher
   • Bouncing a ball is a good game
   • Red balls are more fun to bounce than blue balls or green ones
   • Balls bounce because they want to go back up
8. 8.

   Ren will test sugar in cold and warm circle water. Which hypothesis fits the experiment?

   • Sugar is better than salt
   • If the glass is blue, sugar will dissolve faster
   • If the water is warmer, sugar will dissolve faster
   • Warm water is nicer than cold water
9. 9.

   Why does Zee include a plate of ice cubes with no salt?

   • To compare melting with and without salt
   • To use up the extra ice in the freezer
   • To make the test take longer to finish
   • It is not needed; the salted plate shows the answer

10. Read this first

    Use this

    A jar of water and two piles of bean seeds. Investigation card: what is changed, soaked or dry; what is measured, days to sprout.

11. 10.

    Esme wants to know whether soaking seeds overnight helps them sprout sooner. Which plan has a control group?

    • Soak 10 seeds and keep 10 dry, then plant all 20
    • Soak all 20 seeds, then plant them
    • Soak 10 seeds; plant the dry ones in different soil
    • Soak 1 seed and plant it by itself