Summative Test #1 Understanding Physics Measurements

Liam is conducting an experiment to measure the height of a plant over several weeks. Define accuracy and precision in his measurements.

• Accuracy is the average of all measurements; precision is the range of measurements.

• Accuracy is the closeness to the true value; precision is the consistency of measurements.

• Accuracy refers to the number of measurements taken; precision is the time taken to measure.

• Accuracy is the measurement of error; precision is the measurement of distance.

Maya is preparing for a science fair and needs to understand the difference between accuracy and precision in her experiments.

• Accuracy measures the average; precision measures the total.

• Accuracy is about correctness; precision is about consistency.

• Accuracy is the degree of closeness; precision is the degree of separation.

• Accuracy is about the number of attempts; precision is about the time taken.

Charlotte measured the length of a small object and found it to be 0.00456 meters. How many significant figures are in this measurement?

• 2

• 3

• 4

• 5

Priya has a jar containing 123.456 marbles. She wants to round the number of marbles to three significant figures.

• 124

• 120

• 123.5

• 123

Aiden went to the store and bought 2.34 kg of apples and 1.2 kg of oranges. What is the total weight of the fruits he bought, expressed with correct significant figures?

• 4.0 kg

• 3.4 kg

• 2.5 kg

• 3.5 kg

Michael went to the store and bought 3.00 liters of juice. He then purchased 2.5 times that amount for a party. How many liters of juice did he buy in total, and what is the number of significant figures in the answer?

• 7.00

• 8.0

• 6.0

• 7.5

Convert the number 0.00045 to scientific notation.

• 45 x 10^-5

• 4.5 x 10^-4

• 0.45 x 10^-3

• 4.5 x 10^4

Ava is studying chemistry and comes across a concept involving Avogadro's number, which is 6.02 x 10^23. What is this number expressed in standard notation?

• 602000000000000000000000

• 6020000000000000000000000

• 60200000000000000000000

• 60200000000000000000

Add the following in scientific notation: 3.0 x 10^4 + 2.0 x 10^4.

• 6.0 x 10^4

• 3.0 x 10^5

• 5.0 x 10^4

• 4.0 x 10^4

Michael conducted an experiment to measure the weight of a substance. The accepted value for the weight is 50 grams, but Michael's experimental value was 48 grams. Calculate the percent error.

• 4%

• 5%

• 10%

• 2%