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Home Test Prep GED Section 3 Science

Test Prep GED Section 3 Science Exam Practice Questions (P. 1)

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Question #1
In an acid base reaction, an acid reacts with a base to produce water and a salt. The pH scale can be used to describe the acidity of a liquid. Look at the diagram below. Which two liquids could undergo an acid base reaction?

  1. A
    bleach and ammonia
  2. B
    lye and ammonia
  3. C
    blood and saliva
  4. D
    bleach and vinegar
  5. E
    stomach acid and beer

Correct Answer:
D
It is the only pair of liquids listed in which one is acidic (vinegarpH 3) and the other basic (bleachpH 9).

Question #2
According to Newtons laws of motion, an object set in motion remains in motion unless a force acts on it. If you suspend an object from a string and make it swing, the object will swing for a while, then slow down and stop. Why does the suspended object stop swinging?
  1. A
    because an object at rest remains at rest unless a force acts upon it
  2. B
    because the mass of the object is too small to maintain the motion
  3. C
    because energy is the ability to do work
  4. D
    because gravity is pulling it toward the Earth
  5. E
    because energy of motion is converted to heat through friction with air

Correct Answer:
E
The object set in motion slows down and stops swinging because the force of friction acts on it. The kinetic energy of the object is converted to heat energy through friction with air. Statements a, c, and d are true but are not the reason why the object stops swinging. An object having any mass can maintain motion, so the statement in choice b is wrong.

Question #3
In an exothermic process, heat is released by the process to the surroundings. An example of an exothermic process is burning wood. An endothermic process requires the input of heat from the surroundings. An example of an endothermic process is boiling water. Which of the following is an endothermic process?
  1. A
    detonation of an explosive
  2. B
    melting ice
  3. C
    burning paper
  4. D
    the formation of helium on the sun
  5. E
    freezing water

Correct Answer:
B
An endothermic process requires the input of heat energy. The only one that requires input of energy (heat) is melting ice (ice melts when heated). The rest of the processes listed give off heat, so they are exothermic.

Question #4
Ice floats on water because -
  1. A
    ice is less dense than water.
  2. B
    water conducts heat better than ice.
  3. C
    ice has a lower temperature.
  4. D
    heat from the Earth’s core travels upward, cooling the bottom first.
  5. E
    it needs energy from the sun to melt.

Correct Answer:
A
Things that float are less dense than the substance in which they float.

Question #5
Which of the following is NOT true about gravity?
  1. A
    The more massive two objects are, the greater the gravitational force between them.
  2. B
    Gravitational force between two objects depends only on the mass of the larger object.
  3. C
    Gravitational force between two objects depends on the distance between them.
  4. D
    People can jump higher on the moon than on Earth because the gravitational force between a person and the moon is lower than the gravitational force between a person and the Earth.
  5. E
    A gravitational force exists between the moon and the sun.

Correct Answer:
B
The statement is false because the gravitational force between two objects depends on the masses of both objects. All the other statements are true and consistent with Newtons Law of Gravitation.

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