This is an independent preparation course. It is not the official CAEC Science test, is not affiliated with or endorsed by the CAEC Testing Service (Alberta Education and Childcare) or any province or territory, and does not award the Canadian Adult Education Credential. Practice scores here are feedback only, not official CAEC results.
Börja med lektionerna CAEC Science Preparation: Lessons: cirka 300 minuters läsning. Alla provfrågor tas upp i lektionerna.
Fråga 1 av 16
In an experiment, what is the independent variable? Visa svar Svar: C. The factor the scientist changes on purpose
The independent (manipulated) variable is the one the scientist chooses and changes.
Fråga 2 av 16
In an experiment, what is the dependent variable? Visa svar Svar: D. The factor measured to see the effect
The dependent (responding) variable is what you measure. It may depend on the change you made.
Fråga 3 av 16
Why do scientists keep controlled variables the same in a fair test? Visa svar Svar: B. So only the independent variable can explain the results
If only one factor changes, you can tell what caused the result.
Fråga 4 av 16
What is the independent variable in Maya's experiment? Maya wants to know if the amount of salt in water changes how fast an ice cube melts. She fills four identical cups with 200 mL of tap water at room temperature. She adds 0 g, 5 g, 10 g and 15 g of salt, drops one ice cube of the same size into each cup and times how long each cube takes to melt.
Visa svar Svar: A. The amount of salt in the water
Maya chooses and changes the amount of salt: 0, 5, 10 and 15 g.
Fråga 5 av 16
What is the dependent variable in Maya's experiment? Maya wants to know if the amount of salt in water changes how fast an ice cube melts. She fills four identical cups with 200 mL of tap water at room temperature. She adds 0 g, 5 g, 10 g and 15 g of salt, drops one ice cube of the same size into each cup and times how long each cube takes to melt.
Visa svar Svar: D. The time each ice cube takes to melt
Maya measures melting time to see if it depends on the salt.
Fråga 6 av 16
Which cup acts as the control in Maya's experiment? Maya wants to know if the amount of salt in water changes how fast an ice cube melts. She fills four identical cups with 200 mL of tap water at room temperature. She adds 0 g, 5 g, 10 g and 15 g of salt, drops one ice cube of the same size into each cup and times how long each cube takes to melt.
Visa svar Svar: A. The cup with 0 g of salt
The cup with no salt is the normal condition that the salted cups are compared with.
Fråga 7 av 16
Which is a controlled variable in Maya's experiment? Maya wants to know if the amount of salt in water changes how fast an ice cube melts. She fills four identical cups with 200 mL of tap water at room temperature. She adds 0 g, 5 g, 10 g and 15 g of salt, drops one ice cube of the same size into each cup and times how long each cube takes to melt.
Visa svar Svar: B. The volume of water
Every cup has 200 mL of water, so volume is kept the same.
Fråga 8 av 16
Which group is the control group in Jordan's experiment? Jordan plants 40 bean seeds in identical pots with the same soil. He randomly puts 20 pots in Group A and 20 in Group B. Both groups get the same light and 100 mL of water every two days. Group B also gets plant food once a week. After four weeks he measures the height of every plant.
Visa svar Svar: A. Group A, which gets no plant food
The control group gets everything except the treatment being tested, so Group A is the control.
Fråga 9 av 16
Why did Jordan put the pots into the two groups randomly? Jordan plants 40 bean seeds in identical pots with the same soil. He randomly puts 20 pots in Group A and 20 in Group B. Both groups get the same light and 100 mL of water every two days. Group B also gets plant food once a week. After four weeks he measures the height of every plant.
Visa svar Svar: B. To avoid choosing the best seeds for one group
Random assignment limits bias. Jordan cannot, even by accident, give one group the best seeds.
Fråga 10 av 16
Which is the best testable question for a science fair? Visa svar Svar: C. Does drop height change how high a ball bounces?
A good testable question names something you can change (drop height) and something you can measure (bounce height).
Fråga 11 av 16
Which statement is written as a hypothesis? Visa svar Svar: A. If bread is kept in the fridge, then it will grow mould more slowly, because cold slows mould growth
A hypothesis is a testable prediction with a reason. "If… then… because…" is a common way to write one.
Fråga 12 av 16
A student notices that a puddle in the sun dries faster than a puddle in the shade. Which prediction is based on this pattern? Visa svar Svar: B. Wet clothes hung in the sun will dry faster than in the shade
A prediction applies an observed pattern to a new situation that can then be tested.
Fråga 13 av 16
Tariq tests which paper towel brand holds the most water. He uses a full sheet of Brand X and a half sheet of Brand Y. What is wrong with his test? Visa svar Svar: B. The sheet size was not kept the same
Sheet size is a variable that affects how much water is held. It should be controlled so only the brand changes.
Fråga 14 av 16
Why should each test in an experiment be repeated several times? Visa svar Svar: B. To check results are consistent and reduce one-off mistakes
Repeated trials show whether a result happens again. Averaging them reduces random error.
Fråga 15 av 16
A researcher wants to know how much sleep teenagers in Alberta get. She surveys only students at one school's early-morning hockey program. What is the main problem? Visa svar Svar: B. The sample does not represent all teens in Alberta
A sample should represent the whole group. Early-morning athletes may sleep differently from other teens.
Fråga 16 av 16
A student tests whether music helps people do a puzzle faster. Each person does the puzzle first in silence, then with music. Which change would most improve the design? Visa svar Svar: A. Use a different puzzle of equal difficulty the second time
People get faster the second time they do the same puzzle. Using an equal but different puzzle removes this practice effect.
Tangentbord: 1–4 för att svara, Enter för nästa fråga.
Det riktiga provet: 55% on each CAEC test
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