Post-Test Assessment

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Answer the following questions after the activity.

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1. Does a thick wool sweater 'warm you up' by providing heat to your body? *

No, it acts as an insulator that slows down the loss of your own body heat.

Yes, it absorbs heat from the air and pumps it into your skin.

Yes, wool has a high chemical energy that it releases.

No, it actually cools you down by reflecting sunlight.

I still don't know.

2. An R-value is used to rate insulation. If a wall has a high R-value, what does this indicate about its thermal properties?

It reflects 100% of visible light.

It has high thermal conductivity.

It has high thermal resistance.

It generates heat when it gets cold.

I still don't know.

3. If I double the insulation (R-value) all over my house, my heating bill will be doubled. Why is this statement wrong?

Insulation doesn't work after the first layer.

Doubling insulation makes the house too heavy.

Heat loss is inversely proportional to R-value.

Attics don't actually lose heat.

I still don't know.

4. The U-value of a window is the mathematical inverse of its R-value. A lower U-value means:

The window has no insulation properties at all.

The window is thinner and more fragile.

The window allows more heat to escape.

The window is more effective at keeping heat inside.

I still don't know.

5. Which of the following describes the "Greenhouse Effect" as it applies to a house with many windows?

Glass reflects all incoming sunlight, keeping the inside cool.

Plants inside the house release heat during photosynthesis.

Visible light enters and is converted to infrared radiation that cannot easily escape.

The glass acts as a vacuum, preventing all heat from entering.

I still don't know.

6. Why are dark-colored roofs generally avoided in hot, sunny climates?

Dark colors promote more convection in the attic.

Dark colors have a higher specific heat.

Dark roofs are more likely to leak water.

Dark colors absorb more radiant energy from the sun.

I still don't know.

7. Why is it often recommended to close the curtains on a hot summer day?

To block radiant energy from the sun.

To prevent heat from leaving the house via conduction.

To allow convection currents to cool the glass.

To increase the humidity inside the room.

I still don't know.

8. Is it more efficient to leave your thermostat at a constant temperature all day, or to turn it down when you leave?

Leave it constant; it takes 'too much energy' to heat the house back up.

Leave it constant so the furniture doesn't get 'cold'

Turn it down; you save energy every minute the house is at a lower temperature.

It makes no difference to the total bill.

I still don't know.

9. If a thermostat is placed directly above a heat vent, what is the likely result?

The electricity in the house will short circuit.

The furnace will run forever without stopping.

The rest of the house will remain too cold.

The rest of the house will become too hot.

I still don't know.

10. An engineer is designing a "Passive Solar" home. To maximize heat gain in the winter while minimizing it in the summer, which design feature is most critical?

Calculating the exact length of roof overhangs (eaves).

Installing the furnace in the attic instead of the basement.

Painting the exterior of the house bright red.

Using dark-colored carpets throughout the entire house.

I still don't know.

11. Which design strategy would be most effective for an engineer building a "Net Zero" home in a very cold climate?

Using single-pane glass to let more light in.

Installing the largest possible furnace available.

Building the house entirely underground.

Using better insulation to prevent heat loss.

I still don't know.

12. In a "Net-Zero" home, why might an engineer choose a west-facing roof over a south-facing roof for some panels?

To maximize production during late-afternoon peak demand.

West is the direction of the wind, which cools the panels.

The sun is stronger in the afternoon.

Because west-facing panels don't get hot.

I still don't know.

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