Science Lessons

Two persons were walking on a sidewalk and they saw a sign a sign like this (see the picture). Still they did not touch that place. Why ?

• Because that was a sign of stopping the car.

• Because that was a sign of danger

• Because that was a sign of speed limit

A students was doing an experiment using the scientific method. Every three days the student plans to count the green leaves. Which would be a good hypothesis for this experiment?

• If plants are placed in direct sunlight, then they will grow more green leaves.

• If plants are places in bright light, then they will grow more green leaves than in dim light.

• If plants are place in clay pots, then they will grow more green leaves than plastic pots.

• If plants are in warmer temperatures, then they will grow more green leaves.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

In an experiment, the one variable that is changed is called the

• dependent variable

• independent variable

• experimental variable

• controlled variable

A scientist hypothesizes the the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The independent variable is

• the male alligators

• the gender of the alligator

• the temperature

• the incubator

A scientist hypothesizes the the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The dependent variable is

• the temperature

• the size of the baby alligators

• the incubator

• the gender of the baby alligators

Tags

NGSS.MS-LS1-5

What is the best definition of the term "theory", as it’s used in science?

• What is the best definition of the term "theory", as it’s used in science?

• It is well tested set of ideas that explains events that occur in nature.

• A theory is based on laws that can be proven true.

• It is a hypothesis that has been confirmed

What is the difference between a scientific theory and a scientific law?

• A theory is a well-tested range of representations and a law is a concrete physical representation.

• A theory is a well-tested range of observations of why something works and a law is a well-tested concrete explanation how things work

• A theory is a well-tested range of observations of how something works and a law is a well-tested concrete explanation of why things work

• A theory is a hypothesis that is yet to be proven false and a law is a hypothesis that will always be true.

A series of steps used by scientists to solve a problem or answer a question. 

• scientific method

• recipe

• data collection

• metric system

Tags

NGSS.MS-PS1-2

NGSS.MS-PS2-2

What is the difference between an independent and dependent variable?

• independent variable is what you change in the experiment, dependent variable is the result of the change

• dependent variable is what you change in the experiment, independent variable is the result of the change

• independent variable is altered and dependent variable is altered too

Tags

NGSS.MS-PS3-4

In an experiment, the factor that we measure is called the

• independent variable

• dependent variable

• conclusion

• controlled variable

Tags

NGSS.MS-PS2-2