| 1. 1 pts. |
The diagram below shows a ball held in place by two blocks. The diameter (width) of the ball is shown between the two blocks. What is the diameter of the ball?
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| A. | 6.0 cm | ||
| B. | 8.0 cm | ||
| C. | 14.0 cm | ||
| D. | 17.0 cm | ||
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| 2. 1 pts. |
A measure of the ability of a surface to reflect sunlight is called the ‘albedo’ of the surface. The albedo has a range of values from 0 (no reflection) to 1 (total reflection). The table below gives the albedo values for some surfaces on the Earth. From the table, which of the following surfaces has the biggest range of albedo values?
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| A. | crops | ||
| B. | dry sand | ||
| C. | dry soil | ||
| D. | old snow | ||
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| 3. 1 pts. |
A measure of the ability of a surface to reflect sunlight is called the ‘albedo’ of the surface. The albedo has a range of values from 0 (no reflection) to 1 (total reflection). The table below gives the albedo values for some surfaces on the Earth. The average albedo of the Earth – atmosphere system is currently about 0.30. Scientists think that this value may rise over the next 50 years. Using the information in the table, which one of the following statements supports their idea?
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| A. | More crops are being produced. | ||
| B. | The Earth is getting further away from the Sun. | ||
| C. | There is a decrease in forest area and an increase in urban (concreted) areas | ||
| D. | Less fresh snow is being deposited because of climate change. | ||
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| 4. 1 pts. |
If the angle of incidence is 50 degrees, what is the angle of reflection? | |
| A. | 50 degrees | |
| B. | less than 50 degrees | |
| C. | more than 50 degrees | |
| D. | it depends on how shiny the surface is | |
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| 5. 1 pts. |
In space, radio waves, visible light, and x-rays all have the same | |
| A. | colour | |
| B. | speed | |
| C. | size | |
| D. | energy | |
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| 6. 1 pts. |
A T-shirt fluoresces at a disco because the chemicals in the T-shirt absorb ultraviolet radiation. The chemicals are giving out | |
| A. | light | |
| B. | X-rays | |
| C. | sound | |
| D. | microwaves | |
| E. | infrared radiation | |
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| 7. 1 pts. |
White light is shone onto a filter. What colour of light would a combination of a red and green filter produce if white light were shone on to it? | |
| A. | red | |
| B. | green | |
| C. | yellow | |
| D. | black | |
| E. | blue | |
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| 8. 1 pts. |
What two coloure make up magenta? | |
| A. | yellow & green | |
| B. | red & blue | |
| C. | blue & green | |
| D. | red & green | |
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| 9. 1 pts. |
What colour would a red car appear in a yellow street light? | |
| A. | black | |
| B. | green | |
| C. | yellow | |
| D. | red | |
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| 10. 1 pts. |
At a disco what colour would a yellow t-shirt appear if the light was magenta? | |
| A. | red | |
| B. | blue | |
| C. | yellow | |
| D. | magenta | |
| E. | green | |
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