Question

reviewing content
choose the letter that best answers the question or completes the statement.

1. the application of knowledge to solve practical problems is known as

a. science. b. curiosity.
c. technology. d. experimentation.

1. which is not a branch of natural science?

a. physical science b. life science
c. earth science d. social science

1. what is the purpose of an experiment?

a. to communicate data
b. to test a hypothesis
c. to prove a scientific law
d. none of the above

1. a representation of an object or event is called

a. a scientific law. b) a model.
c. a hypothesis. d. a variable.

1. which value is equivalent to 5×10^6?

a. five thousand b. fifty thousand
c. five million d. fifty million

1. what is the si base unit of mass?

a. gram b. kilogram
c. milligram d. pound

1. an electric generator produces 10 megawatts. this amount is equivalent to

a. 10,000 watts. b. 1,000,000 watts.
c. 10,000,000 watts. d. 0.010 watt.

1. which of the following is a ratio of equivalent measurements that is used to convert a quantity expressed in one unit to another unit?

a. slope b. conversion factor
c. derived unit d. density

1. when the ratio of two variables is constant, their relationship can be described as

a. inversely proportional.
b. interdependent.
c. directly proportional.
d. parallel.

1. which of the following would best suit data that describe how a part relates to the whole?

a. line graph b. bar graph
c. circle graph d. scientific notation
understanding concepts

1. give an example of a case where the branches of natural science appear to overlap.
2. what is the goal of a scientific method?
3. how are controlled experiments useful?
4. suppose you perform an experiment, and the resulting data do not support your hypothesis. what is the next step you might take?
5. what are some safety precautions that you should follow when working in the laboratory?
6. what is scientific notation?
7. what are the si base units for length and temperature?
8. how do derived units differ from base units?
9. how is the precision of a calculated result related to the precision of the measurements used in the calculation?
10. how can you convert a temperature expressed in degrees celsius to kelvins?
11. which of the following graphs describes a direct proportion?
12. why is it important for scientists to communicate their results?

Explanation:

Step1: Recall definitions

The application of knowledge to solve practical problems is technology. So for question 1, the answer is c.

Step2: Identify natural - science branches

Social science is not a branch of natural science. For question 2, the answer is d.

Step3: Understand experiment purpose

The purpose of an experiment is to test a hypothesis. For question 3, the answer is b.

Step4: Know scientific terms

A representation of an object or event is a model. For question 4, the answer is b.

Step5: Calculate scientific - notation value

$5\times10^{6}=5000000$ which is five million. For question 5, the answer is c.

Step6: Recall SI base units

The SI base unit of mass is kilogram. For question 6, the answer is b.

Step7: Convert power units

1 megawatt = 1000000 watts, so 10 megawatts = 10000000 watts. For question 7, the answer is c.

Step8: Recall unit - conversion concept

A conversion factor is a ratio of equivalent measurements used to convert a quantity from one unit to another. For question 8, the answer is b.

Step9: Understand variable relationships

When the ratio of two variables is constant, they are directly proportional. For question 9, the answer is c.

Step10: Choose appropriate graph

A circle graph best suits data that show how a part relates to the whole. For question 10, the answer is c.

Answer:

1. c. technology
2. d. social science
3. b. to test a hypothesis
4. b. a model
5. c. five million
6. b. kilogram
7. c. 10,000,000 watts
8. b. conversion factor
9. c. directly proportional
10. c. circle graph