Practice Exam #2

Question 1

A student is working on a science project and is going through each step of the scientific method. After the student this is her first experiment and reports results of the experimental test, what is the next step?

Answer 1

Repeat the experiment to validate it

Question 2

The student formed the following hypothesis:

Lengthening the string of the pendulum increases the time it takes the ball to make one complete period.

What correction would you have the student make to make to the hypothesis?

Answer 2

Turn it into an “if/then” statement

Question 3

Hypothesis are “_______” cases

Answer 3

Cause/effect

Question 4

A student is conducting an experiment using a ball that is attached to the end of a string on a pendulum. The student pulls the ball back so that it is at an angle to its resting position. As the student releases the ball, it swings forward and backward. The student measures the time it takes the ball to make the one complete. Period. Period Is defined as the time it takes the ball to swing forward and back again to it starting position. This is repeated using different string lengths.

What would be the appropriate control variable for this experiment?

Answer 4

The mass of the ball

Question 5

Once a hypothesis has been verified and accepted it becomes a _______

Answer 5

Theory

Question 6

Hey student is measuring morning and afternoon temperatures for a school project using a thermal infrared gun instrument. Instrument is calibrated incorrectly and produces a cold bias of 7/10 of a degree in all the temperature measurements. How should the student deal with this error?

Answer 6

This is a systematic error and the student should take it into consideration when analyzing the results by increasing the temperatures 7/10 of a degree.

Question 7

What is the purpose of conducting an experiment?

Answer 7

To test a hypothesis

Question 8

When performing a dissection why do you rinse a specimen before handling?

Answer 8

It gets rid of harmful chemicals

Question 9

Are decaying specimens ever permitted in a dissection?

Answer 9

Under certain circumstances 

Question 10

After science laboratory exercise, Some solutions remain unused and are left over. What should be done with the solutions?

Answer 10

Dispose according to local disposal procedures