Bootcamp Quiz #2

A student conducts an experiment in which she drops objects, each with a different mass, all from the same height. She uses a stopwatch and records the time it takes for each object to hit the ground. Which of the following is the independent variable in her experiment?

• time the object travels

• height at which object is dropped

• mass of the object

• stopwatch used

Within the visible spectrum of light, there are many colors: red, orange, yellow, green, blue, indigo, and violet (ROY G BIV). What characteristic of each of these colors makes this spectrum of light visible to the human eye?

• Each color has a different wavelength

• Each color travels at a different speed

• Each color must travel a different distance to our eyes

• Each color has a different level of intensity

Tags

NGSS.MS-PS4-1

Sound waves need to travel through something made of atoms or molecules in order to keep moving. They travel at different speeds through different materials. Through which of the following would they be likely to travel fastest?

• Air

• Water

• Juice

• Wood

Tags

NGSS.MS-PS4-2

Jacob went down to the lake on a very still day. The water's surface was completely smooth and he could see the reflection perfectly in the water. A breeze came up and disturbed the surface of the water and a tree reflected there disappeared. Why couldn't he see the tree's reflection when the water was still, but not when it was disturbed?

• The disturbed surface kept the light waves from reflecting, making it impossible to see an image

• The disturbed surface changed the light waves' wavelengths, changing the reflected image

• The disturbed surface made the light waves reflect in many directions, breaking up the image

• The disturbed surface allowed some of the light waves to penetrate into the water, making gaps in the image

Tags

NGSS.MS-PS4-2

In an animal, a muscle cell requires more energy than other cells. Because of this, you would expect to find more of which type of organelles in muscle cells than in other cells?

• cell walls

• chloroplasts

• mitochondria

• vacuoles

Tags

NGSS.MS-LS1-7

When conducting an experiment, which of the following is most important in getting valid results?

• Technology needs to be used to determine the results

• An unbiased observer must witness the experiment

• The outcome needs to be controlled

• Only one variable must be changed during the experiment

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

Plant cells are different from animal cells. The diagram below identifies four different structures in a plant cell. Compared to the structures in an animal cell, which of the following structures is found only in a plant cell?

• cell wall

• cytoplasm

• mitochondrion

• nucleus

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

After many years of conducting experiments and collecting data, Newton stated or described that the unbalanced forces acting on an object as being equal to the object's mass times its acceleration. The formula is F = ma. This is an example of which of the following?

• a scientific theory

• a scientific law

• an experimental result

• a hypothesis

Tags

NGSS.MS-PS2-2

Ultraviolet light comes from the Sun and can sometimes cause serious health issues such as skin cancer. Why does ultraviolet light have this effect on our bodies, but visible light does not?

• Ultraviolet light has more energy than visible light

• Ultraviolet light moves faster than visible light

• Ultraviolet light has less energy than visible light

• Ultraviolet light is attracted to our skin

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-4

Scientists use the word theory to mean something very different from what theory means in everyday life. For instance, in everyday life a person might say 'I have a theory about why Paul got that job and Walter didn't.' What do scientists mean when they use the word theory?

• We have a great deal of solid, convincing evidence to back up the statement.

• We have gathered some decent evidence about this but not enough to call it a law.

• We have a great deal of solid, convincing evidence to back up the explanation.

• We have some evidence in support of this but there is also evidence that refutes it.