Georgia Science Grade 8

Chapter 15: Thermal Energy

CRCT Practice

1
Which describes a refrigerator?
A)heat engine
B)conductor
C)heat mover
D)insulator
2
The glass on the left contains water at 0°C, and the glass on the right contains water at 30°C. Which of the following is true?

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A)Molecules in the colder water have a higher average kinetic energy.
B)Molecules in the warmer water have a higher average kinetic energy.
C)Molecules in the warmer water move more slowly.
D)Molecules in the two glasses move at the same speed.
3
What is the difference in temperature on the Kelvin scale of the water in the two glasses?

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A)30 K
B)86 K
C)243 K
D)303 K
4
A sample of each of these metals is formed into a 50-g cube. If 100 J of heat are applied to each cube, which metal would change temperature by the greatest amount?

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A)aluminum
B)copper
C)lead
D)nickel
5
An internal combustion engine converts thermal energy into which form of energy?
A)chemical
B)mechanical
C)radiant
D)electrical
6
Which is not a stroke in the four-stroke cycle of an internal combustion engine?
A)compression
B)exhaust
C)thermal
D)power
7
Which is a statement of the law of conservation of energy?
A)Energy can never be created or destroyed.
B)Energy can be created, but never destroyed.
C)Energy can be destroyed, but never created.
D)Energy can be created and destroyed only when it changes form.
8
Which can cause convection?
A)heating a liquid from above
B)heating a liquid from below
C)cooling a solid from above
D)cooling a solid from below
9
Why is the handle of this kettle made of plastic?

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A)Plastic is a good conductor.
B)Plastic is a good insulator.
C)Plastic has a high specific heat.
D)Plastic has a low specific heat.
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