Introduction to 8th Grade Science

What step does every scientific experiment begin with?

• hypothesis

• question/problem

• procedures

• conclusion

Answer explanation

Every scientific experiment begins with a question or problem that needs to be addressed. This initial step guides the direction of the research and helps formulate a hypothesis, making 'question/problem' the correct choice.

The educated guess you make at the beginning of the scientific method is called the...

• variable

• conclusion

• hypothesis

• procedure

Answer explanation

The educated guess made at the beginning of the scientific method is called a hypothesis. It is a testable statement that predicts the outcome of an experiment, guiding the research process.

You use your five senses to find out about the world around you. This is called______.

• observations

• data

• conclusion

• scientific method

Answer explanation

You use your five senses to gather information about your surroundings, which is known as observations. This process helps you understand the world better.

Tags

NGSS.MS-LS1-8

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

• scientific method

• recipe

• data collection

• metric system

Answer explanation

The correct answer is 'scientific method' as it refers to the systematic series of steps scientists use to investigate questions and solve problems, unlike the other options which do not represent a problem-solving process.

Tags

NGSS.MS-PS1-2

What is a hypothesis?

• an educated guess stating what you believe will be the result of your experiment

• a random guess

• a statement of the outcome of your experiment

• step by step directions for your experiment

Answer explanation

A hypothesis is an educated guess that predicts the outcome of an experiment. It is not a random guess, a definitive statement of results, or directions for the experiment, making the first choice the correct one.

Tags

NGSS.HS-LS1-3

Which scientific instrument would best be used to measure a small distance?

• Ruler

• Stopwatch

• Balance

• Pipette

Answer explanation

A ruler is the best instrument for measuring small distances due to its precision and ease of use. A stopwatch measures time, a balance measures mass, and a pipette is used for liquid volumes, making them unsuitable for distance measurement.

What number is the metric system based on?

• 10

• 20

• 1

• 100

Answer explanation

The metric system is based on the number 10, which allows for easy conversion between units by using powers of ten. This decimal system simplifies calculations and measurements.

The base unit of metric length.

• Meter

• Liter 

• Kilogram

• Milligram

Answer explanation

The base unit of metric length is the meter. It is the standard unit used to measure distance in the metric system, unlike the liter (volume) and kilogram (mass). Therefore, the correct answer is meter.

What is the length of the key?

• 2 cm

• 0 cm

• 4 cm

• 2 inches

Answer explanation

The correct answer is 2 cm, as it directly states the length of the key. The other options either indicate no length or are in different units, making them incorrect.

The abbreviation for gram is...

• G

• gg

• g

• gr

Answer explanation

The correct abbreviation for gram is 'g'. Other options like 'G', 'gg', and 'gr' are not standard abbreviations for gram in scientific contexts.