Sample GED Science Questions

1. The graph below shows how the solubility of a substance in 100 grams of water changes as the water temperature is increased. Questions 13 and 14 refer to this graph.

What would the solubility of the substance likely be if the water was heated to 150 degrees Celsius?

A. 30 g/100g of water
B. 40 g/ 100g of water
C. 50 g/100g of water
D. 90 g/100g of water
E. 120 g/100g of water

2. Consider the following scenario while referring to the chart provided. You add 100 grams of water to a beaker and heat it to a temperature of 80 degrees Celsius. At this temperature, you are able to dissolve 40 grams of the substance. What will likely happen if you cool the water to 40 degrees Celsius?

A. The water will be able to dissolve more of the substance.
B. There will be no observable change in the mixture.
C. The substance will begin to evaporate.
D. The volume of the mixture will increase.
E. The substance will begin to collect on the bottom of the beaker.

Questions 3 and 4 refer to the paragraph and figure below.

In the field of genetics, Punnett squares are often used to calculate the chances that the offspring of two parents will inherit a specific genetic trait. There are two types of traits: dominant and recessive. A recessive gene is usually represented by a small letter (e), while a dominant gene is represented by a capital letter (E). For a person to display a recessive trait, they must have two copies of the recessive gene (ee). Otherwise, they will display the dominant trait. The following is a Punnett square for eye color. E, which represents brown eyes, is the dominant trait and e, which represents blue eyes, is the recessive trait.

  Mother
  E E
Father E EE EE
e Ee Ee

3. What are the chances that a child born from these parents will have brown eyes?

A. 0%
B. 25%
C. 50%
D. 75%
E. 100%

4. If the mother in the above example had brown eyes, but also carried the trait for blue eyes (Ee), what would the chances be that her offspring would have blue eyes?

A. 0%
B. 25%
C. 50%
D. 75%
E. 100%


Answer Key:

1. Correct Answer: B

Explanation: The solubility of the substance increases at a steady rate until the water temperature reaches 80 degrees Celsius. The solubility does not change when the water temperature is between 80 degrees and 100 degrees Celsius. Therefore, it is reasonable to assume that the maximum solubility (40g/100g of water) is reached at 80 degrees Celsius. As such, it can logically be concluded that the solubility would still be the same at 150 degrees Celsius.

2. Correct Answer: E

Explanation: The chart shows that the solubility of the substance increases as the temperature rises. In other words, more of the substance can be dissolved in the water as the temperature of the water rises. At 80 degrees Celsius, the highest amount of the substance that can be dissolved in 100 grams of water is 40 grams. If you cool the water to 40 degrees Celsius, only about 18 grams of the substance can be dissolved. Since the water cannot dissolve the full amount of the substance it was able to dissolve at 80 degrees, the undissolved substance will collect at the bottom of the beaker.

3. Correct Answer: E

Explanation: A child would have to inherit two copies of the recessive gene (e) to have blue eyes. Since the Punnett square provided shows this is impossible with these two parents, there is no chance that the child would have blue eyes. Since the brown-eyed gene is dominant in both parents, there is a 100% chance that the child will have brown eyes.

4. Correct Answer: B

Explanation: The easiest way to answer this is to construct another Punnett square, this time filling in Ee for the mother instead of EE:

  Mother
  E e
Father E EE Ee
e Ee ee

The child must have two copies of the recessive gene (ee) to have blue eyes. There is a one in four chance of this happening. Therefore, the chances they will have a blue-eyed child are 25%.

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Last Updated: 04/24/2014

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