Science Review Quiz 6

What is a hypothesis?

• an explanation that has been fully proven scientifically

• the result of an experiment

• a wild guess about why things happen

• a possible explanation of a set of facts

Which is not a way to test a hypothesis?

• by analyzing the problem with mathematics

• by conducting an experiment

• by taking a poll of people's opinions about the hypothesis

• by studying data already collected

Sharon has designed airplanes for a class project. She is adding paper clips as weights to the end of the wings for different flight effects. What is the dependent variable in her exploration?

• the weight of the paper clips she adds

• the different observable flight patterns of her planes

• the placement of the paper clips

• the type of paper she uses to build her planes

John is conducting an experiment with toy cars rolling down a ramp. He wants to measure how the incline of the ram affects the distance the toy cars travel. What would be the dependent variable in his experiment?

• the type of toy cars

• the height of the ramp's incline

• the distance the toy cars travel

• the type of ramp used

Katie wants to find out how long it takes sugar to dissolve in tea. She adds 1 teaspoon of sugar to a glass of tea and stirs. She records the time it takes for all the sugar to dissolve. Next, she adds 2 teaspoons of sugar to another glass of tea, stirs and records the time it takes to dissolve. Jocelyn repeats this process until she is adding 5 teaspoons of sugar. What is the independent variable in her experiment?

• the brand of tea used

• the number of teaspoons of sugar used

• the temperature of the tea

• the amount of times the tea stirred

• The toy car traveled the same distance on the smooth surface and the rough surface.

• The toy car traveled faster on the smooth surface than on the rough surface.

• The toy car traveled a longer distance on the rough surface than on the smooth surface.

• The toy car traveled father on the smooth surface than on the rough surface.

About how many bears were seen in June?

• 35

• 30

• 25

• 40

What is the dependent variable in this experiment?

• time

• month

• number of sightings

• There is no dependent variable.

Why were there no bear sightings from January to March or November to December?

• The bears were hiding.

• There were no people to make observations.

• The bears died.

• The bears were hibernating.

Which statement is a reasonable hypothesis?

• More bears will be seen at dawn.

• More bears will be seen at night.

• More bears will be seen when they are not in hibernation.

• Bears are just as likely to be seen during any of the above times.