2019-2020 Miller Science CFA #4

Which household appliance converts electrical energy to thermal energy?

• calculator

• gas clothes dryer

• hair dryer

• telephone

Which item, when placed in the gap below would allow the light bulb to turn on?

• plastic comb

• metal pin

• wooden toothpick

• rubber ball

Refer to the diagram.

What kind of energy is illustrated in this diagram?

• electrical

• thermal

• mechanical

• potential

Which form of energy will be demonstrated when the woman pushes the wheelchair?

• Mechanical

• Electrical

• Light

• Thermal

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The picture shows an electrical cord used on a new toaster.

Why is the cord made of both plastic and copper?

• The plastic is a conductor and the copper is an insulator of electricity.

• The plastic and the copper are both conductors of electricity.

• The plastic is an insulator and the copper is a conductor of electricity

• The plastic and the copper are both insulators of electricity.

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Refer to the diagram.

What kind of energy is produced from this candle?

• light

• sound and thermal

• thermal

• thermal and light

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Based on this experiment, which of the following is the BEST conclusion?

• Metal sticks to magnets better than wood.

• Wood burns more easily than metal.

• Metal is a better conductor than wood.

• Spoons conduct better than toothpicks.

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On a windy day, a student flew a kite in an open field. What type of energy is used to fly a kite?

• Electrical energy

• Mechanical energy

• Sound energy

• Thermal energy

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Cell phones can be plugged into a wall electrical outlet or they can use batteries inside the phone. How can both work for a cell phone?

• Both wall outlets and batteries provide a source of electrical energy.

• Cell phones have transformers that don't need electrical energy.

• Batteries are used to charge electrical wall outlets.

• Electrical outlets and batteries are both smaller than the cell phone.

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A class poured 90 degree water in three different cups and let them sit for 30 minutes. The students recorded the beginning and ending temperatures in the chart below.

Based on the information, which item is the BEST insulator of thermal energy?

• the cup made of plastic

• the cup made of styrofoam

• the cup made of glass

• they all insulate the same

Tags

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