7th Grade Unit A Exam
This exam will evaluate your level of knowledge concerning variable, experiments, and data. Take your time when selecting answers because you cannot go back. Good luck!
- 1.Which of the following is NOT a part of a well-designed experiment?
- A.
A control group
- B.
Many trials
- C.
A reproducible procedure
- D.
Small sample size
- 2.A scientist is interested in comparing the circulatory systems of different types of worm. What is the scientist most likely to do first?
- A.
Develop a procedure
- B.
Analyze data
- C.
Make a conclusion
- D.
Collect evidence
- 3.What is an independent variable?
- A.
Something you measure or observe
- B.
Something you change on purpose
- C.
Something that can change but you keep it the same
- D.
Something that you do not change and compare your results to
- 4.Miguel doesn't like eating raw carrots. He decides to provide his parents with qualitative data to support his opinion. Which of the following data is NOT qualitative?
- A.
Carrots taste dry
- B.
A raw carrot is hard to chew
- C.
An uncut carrot is two inches too long to fit into his lunchbox
- D.
Carrots are difficult to peel
- 5.Alejandra wants to find out how long it takes her baby sister to fall asleep. What should her dependent variable be?
- A.
Time she falls asleep
- B.
Noise levels
- C.
Size of crib
- D.
Type of crib
- 6.Michelle wonders which of her friends is the fastest. She decides to have them run a race, starting at one end of the soccer field and ending at the other side. Which variable should she control?
- A.
Time
- B.
Distance
- C.
Both a and b
- D.
None of the above
- 7.You are worried that your results are not very consistent (numbers all over the place). What should you do to address this concern.
- A.
Increase the number of trials
- B.
Change the measurements
- C.
Use feet instead of meters
- D.
Graph the results
- 8.What is a dependent variable?
- A.
Something you measure of observe
- B.
Something you change on purpose
- C.
Something that can change but you keep it the same
- D.
Something that doesn't change but you compare the results to it
- 9.Sean is thinking about using seawater to water his plants. Sean places 10 plants near a window for 20 days. Each day, he waters five plants with 10 mL of seawater and five plants with 10 mL of fresh water. He measures their heights before and after the 20 days.Which of the following could be a hypothesis for Sean's experiment?
- A.
I hypothesize that plants need water to grow.
- B.
I hypothesize that plants need sunlight to grow.
- C.
I hypothesize that salt water will inhibit (prevent or slow down) the growth of plants.
- D.
I hypothesize that different types of plants will be less affected by the salt water.
- 10.(continued) Sean is thinking about using seawater to water his plants. Sean places 10 plants near a window for 20 days. Each day, he waters five plants with 10 mL of seawater and five plants with 10 mL of fresh water. He measures their heights before and after the 20 days.What is Sean's independent variable?
- A.
Daily amount of sunlight
- B.
Daily amount of water
- C.
Type of water used
- D.
Type of plant used
- 11.(continued) Sean is thinking about using seawater to water his plants. Sean places 10 plants near a window for 20 days. Each day, he waters five plants with 10 mL of seawater and five plants with 10 mL of fresh water. He measures their heights before and after the 20 days.What is Sean using as the control group?
- A.
Type of plant used
- B.
The plants receiving fresh water
- C.
The plants receiving salt water
- D.
Type of water used
- 12.Sean collected both qualitative and quantitative data. Which of the following would be an example of each type of data that he should have collected to determine the overall growth of the plant?
- A.
Size of the plant and length of the leaves
- B.
Color of the plants and how the leaves feel
- C.
Smell of the plant and size of the pot
- D.
Color of the leaves and height of the plants
- 13.Which of the following is an example of qualitative data?
- A.
Counting the number of men in a class
- B.
Finding the length of a table
- C.
Measuring the amount of liquid a cup holds
- D.
Determining how far a plane can fly
- 14.What do all Titles, Questions, and Hypotheses have in common?
- A.
They are used in most experiments
- B.
They have an independent variable
- C.
They have a dependent variable
- D.
They have an independent and dependent variable
- 15.What are constants or controlled variables?
- A.
Something you measure or observe
- B.
Something you change on purpose
- C.
Something that can change but you keep it the same
- D.
Something that you compare the results to
- 16.When studying people, why is it so important to have a large sample size?
- A.
Because people make a lot of mistakes
- B.
People have a lot of variation and a large sample size gives you better data
- C.
People need time to make decisions
- D.
People need better data so they put the data into graphs and tables
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