Indiana Science Grade 8

Chapter 10: Electricity

Standardized Test Practice

1.
Which appliance uses the least energy if it is run for 20 minutes?

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A)color TV
B)computer
C)hair dryer
D)toaster
2.
What is the current in the computer if it is plugged into a 110-V outlet?

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A)3.2 A
B)0.31 A
C)0.35 A
D)3.9 A
3.
How much would it cost to run the stereo for 2 hours if 1,000 W of power costs $0.12 per hour?

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A)$0.12
B)$0.24
C)$0.06
D)$0.48
4.
Of current, resistance, and voltage, which can vary among different branches of a parallel circuit?
A)only resistance
B)only current and resistance
C)only voltage
D)only current and voltalge
5.
What property of a light bulb's filament causes it to glow?
A)high voltage
B)high resistance
C)low resistance
D)low voltage
6.
Which statement describes how electric charges affect each other?
A)positive and negative charges repel
B)two positive charges attract
C)two negative charges attract
D)positive and negative charges attract
7.
What grounding device is sometimes placed on the tops of buildings?
A)lightning rod
B)circuit
C)circuit breaker
D)fuse
8.
How does the power use change if the resistance of the device increases from 5 Ω to 20 Ω?

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A)divided by 5
B)divided by 4
C)multiplied by 4
D)multiplied by 5
9.
If a thin and a thick wire are otherwise identical, what property is lower for the thicker wire?
A)current
B)static charge
C)resistance
D)voltage
10.
A simple electrical circuit has two lightbulbs with a resistance of 0.15 Ω each. If the circuit has a voltage of a 6.3-V, what is the current?
A)1.9 A
B)2.3 A
C)2.1 A
D)4.2 A
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