WorksheetsScience Unit 7 Review
Total questions: 21
Worksheet time: 11mins
Name
Class
Date
1.
1. Which of these materials is a conductor?
a)
rubber
b)
chalk
c)
gold
d)
glass
2.
2. What is one use for an insulator?
a)
It slows down the flow of electric current to produce heat and light.
b)
It stores electric energy for later use.
c)
It allows electric current to flow through it.
d)
It makes electrically charged objects safe to handle.
3.
3. Electric current cannot flow in a series circuit if
a)
the circuit contains an insulator.
b)
there is a break in the circuit.
c)
the circuit contains a resistor.
d)
the circuit has only one loop in it.
4.
4. One example of a resistor is
a)
a power cord
b)
a parallel circuit
c)
a battery
d)
a filament
5.
5. What will happen in a parallel circuit if one of its loops is broken?
a)
electric current will not flow through any of the loops
b)
electric current will still flow through the broken loop
c)
electric current will still flow through the unbroken loops
d)
the energy source will stop providing energy to move electric charges
6.
6. Which of the following is caused by the energy of motion?
a)
resistor
b)
friction
c)
conductor
d)
filament
7.
7. Which of the following uses resistors to transform electricity into heat?
a)
a toaster
b)
a car engine
c)
a gas stove
d)
a wind turbine
8.
8. Which of the following groups of materials make the best insulators?
a)
Gold, wood, copper
b)
Copper, plastic, gold
c)
Rubber, glass, plastic
d)
Graphite, glass, wood
9.
9. An engineer is designing a new type of electrical wire. He wants to make sure that electricity will flow through the wire very easily. He tests four materials and performs each test several times to make sure that the results are accurate. Based on the results in the table, which material would be best for the new type of electrical wire?
a)
Material A
b)
Material B
c)
Material C
d)
Material D
10.
10. Why is copper classified as a conductor?
a)
Electric current travels easily through copper.
b)
Copper may gain or lose electric charges.
c)
Copper resists the flow of electrical current.
d)
None of the other answer choices.
11.
11. What are two types of electrical charges in atoms?
a)
Polar or nonpolar
b)
Strong or weak
c)
Positive or negative
d)
None of the other answer choices
12.
12. What can make some reference materials more useful than others?
a)
Some reference materials are more easily available.
b)
Some reference materials have more recent information.
c)
Some reference materials are written by scientists.
d)
All of the other answer choices
13.
13. Why might scientists repeat experiments?
a)
To avoid thinking about new experiments
b)
To check their results
c)
To record their observations
d)
None of the other answer choices
14.
14. A student is planning a descriptive investigation about land features in Texas. Which of the following is the best question for this investigation?
a)
Which is the best land feature in Texas?
b)
Where in Texas can each type of land feature be found?
c)
Do more people enjoy visiting the mountains of Texas or the beaches?
d)
None of the other answer choices
15.
15. The experiment results in the table tell how many times each dog correctly followed the command. Each dog was given each command five times. What conclusion can be made based on the results of the investigation?
a)
Dog B followed the command "Sit" four times.
b)
Each dog was given each command five times.
c)
Three commands were given to three dogs.
d)
"Stay" is the hardest command for dogs to follow.
16.
16. Data collected about students in Mr. Ballard's class is shown in the bar graph, but it needs a title. What title would best complete this graph?
a)
Hair Colors of Boys and Hair Colors of Girls in Mr. Ballard's Class
b)
Student Hair Colors
c)
Number of Students with Each Hair Color in Mr. Ballard's Class
d)
Who Has Which Hair Color in Mr. Ballard's Class
17.
17. Sofia and her class are investigating whether a rubber ball will bounce higher on a hard tile floor or on a carpeted floor. Students drop the ball from one meter above the floor and measure how high it bounces. They first drop on a tile floor and then on a carpeted floor. How can the students improve the reliability of their investigation?
a)
They can ask the teacher whether their investigation was done will.
b)
They can check the internet for the results of similar rubber ball tests.
c)
They can ask the rubber ball company for a report on their product testing.
d)
They can repeat the test a few more times to se if they get the same results.
18.
18. Ivan wants to know which dessert from the school lunch menu is the favorite of students in his class. What would be the best way for him to collect his data?
a)
By researching the cafeteria's record of dessert sales
b)
By observing the desserts the students purchased at lunch
c)
By asking a sample of students in his class to name their favorite dessert
d)
By doing a survey of every student in the class, asking each one to name his or her favorite dessert.
19.
19. At the end of a science investigation, why is it important to analyze data and interpret the patterns you find?
a)
To decide if you have answered your question and supported your hypothesis
b)
To decide which data are useful and which are not useful
c)
To make sure your data support the ideas of others
d)
To generate new data for the investigation
20.
20. Two students are testing how high a ball will bounce. Each student drops a ball. one student's bounce height is 20 cm. The other student's bounce height is 60 cm. Explain why these results might be different.
4 lines
21.
21. Look at the picture of the electrical circuit. Explain what will happen to this circuit if a rubber eraser is placed between the battery and one of the wires connected to it.
4 lines
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