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Middle School 8

Science

diagnostic Test Grade

Saba Tahir

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Question 1

Multiple Choice

A student wants to investigate if temperature affects how fast sugar dissolves in water. What is the best question for her investigation?

Why do people put sugar in tea?
Does sugar dissolve faster in hot or cold water?
Is sugar healthy?
Why does sugar taste sweet?

Question 2

Multiple Choice

During an experiment, a student observes that plants in sunlight grew faster than those kept in the dark. What is the student doing?

Making an opinion
Asking a question
Changing variables
Collecting data

Question 3

Multiple Choice

Which of the following is a hypothesis?

Plants are pretty.
I like sunny weather.
I think sunlight helps plants grow faster.
Plants need water.

Question 4

Multiple Choice

A student keeps all conditions the same except the type of liquid used to water plants. What is the independent variable in this investigation?

Plant height
Type of plant
Type of liquid
Amount of sunlight

Question 5

Multiple Choice

After collecting results, what should a scientist do next?

Report findings and draw conclusions
Ignore the unexpected data
Change the hypothesis
Repeat the experiment exactly the same

Question 6

Multiple Choice

A student tests if salt affects the freezing point of water by adding different amounts of salt to the same amount of water. What would be a fair test?

Freezing at different times of day
Using the same amount of water, only changing the salt amount
Using different cups and amounts of water each time
Changing both the salt and the water volume

Question 7

Multiple Choice

Which statement shows evidence-based reasoning?

According to the data, the chemical raised the pH by 2.5 units.
I don’t like the results, so they’re wrong.
The water looked clean, so it must be safe.
I think the chemical is dangerous because it smells.

Question 8

Multiple Choice

Why is it important to control variables in an experiment?

To reduce the number of steps
To ensure fair results
To make the experiment fun
To save materials

Question 9

Multiple Choice

What is the purpose of repeating an experiment several times?

To make the experiment more interesting
To confirm results and check for accuracy
To save time
To change the hypothesis

Question 10

Multiple Choice

A student says, “The baking soda fizzed when I added vinegar.” This is an example of:

a procedure
a conclusion
a hypothesis
an observation

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