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Home Test Prep GED Section 3 Science

Test Prep GED Section 3 Science Exam Practice Questions (P. 2)

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Question #6
Change of phase is a process whereby matter changes form (solid, liquid, gas). Which one of the following constitutes a phase change?
  1. A
    condensation of water vapor
  2. B
    photosynthesis
  3. C
    digestion of food
  4. D
    dry-cleaning
  5. E
    exhaling

Correct Answer:
A
When water vapor condenses, gas changes to liquid. Choices b, c, and d involve chemical reactions and cant be considered physical processes. Through exhaling, choice e, air is pushed out of the lungs, but there is no phase change.

Question #7
Two negatively charged spheres -
  1. A
    repel each other.
  2. B
    attract each other.
  3. C
    neither attract nor repel each other.
  4. D
    can either attract or repel each other depending on their position.
  5. E
    attract each other only when the distance between them is small.

Correct Answer:
A
Two like charges always repel.

Question #8
Which statement about energy and/or matter is incorrect?
  1. A
    Matter and energy can’t be destroyed.
  2. B
    Matter and energy can’t be created.
  3. C
    All matter tends toward more disordered states.
  4. D
    Energy can be stored and transferred.
  5. E
    Heat energy is composed of heat atoms.

Correct Answer:
E
The statement is false because energy is not composed of matter (atoms). All other statements are true.

Question #9
The boiling point in hydrocarbons (molecules containing H and C) increases with increasing molecular weight due to larger intermolecular forces. Which of these hydrocarbons would you expect to have the highest boiling point?

  1. A
    a
  2. B
    b
  3. C
    c
  4. D
    d
  5. E
    e

Correct Answer:
E
The molecule in choice e has the most atoms and the largest molecular weight. It therefore has the highest boiling point.

Question #10
People wear woolen gloves in the winter because gloves
  1. A
    generate heat energy through radiation.
  2. B
    increase the temperature of cold air through convection.
  3. C
    decrease the loss of body heat to surroundings through insulation.
  4. D
    increase the amount of heat energy generated by the body through conduction.
  5. E
    transform cold wind energy into thermal energy.

Correct Answer:
C
Gloves provide insulation. They cant generate heat, choice a. Gloves left out in the snow would be cold. Gloves cant have an effect on the temperature, choice b.
They also dont affect the amount of energy your body produces, choice d, or transform energy in any way, choice e.

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