GED Practice

GED Science Review: Types of Energy


Questions:

Question 1 refers to the following passage.

The atom is composed of a dense nucleus that contains protons and neutrons. The process of splitting heavier nuclei into lighter nuclei is called fission. Hitting a nucleus with a neutron causes it to undergo fission. When the nucleus splits. both neutrons and energy are released. Nuclear power plants use uranium-235. The number 235 refers to the total number of protons and neutrons in the nucleus.


  1. Which statement explains why nuclear fission can produce energy with little energy input?
    • Uranium-235 undergoes fission automatically.
    • Uranium-235 is plentiful and easily processed into fuel.
    • A single fission reaction produces additional fission reactions.
    • A single nucleus releases an explosive amount of energy when split.

      Question 2 through 4 refer to the following passage.

      During a lecture in 1820, the Danish physicist Hans Oersted noticed that an electric current he produced changed the direction of a nearby compass needle. He concluded that electric current could produce a magnetic field. Thus, Oersted was the first to demonstrate that electricity and magnetism are related—a discovery that changed human history because it made possible to have machines that employ electromagnetism.
      Shortly afterward, a French scientist, André-Marie Ampère, proved that wires could behave like magnets when electrical current passed through then. He also showed that reversing the direction of the current reversed the polarity of the magnetic field.
            In 1821, English scientist Michael Faraday showed the reverse of what Oersted had observed: that a magnet could cause a current-carrying wire to move. This phenomenon is the underlying principle of the electric motor, which converts electrical energy into mechanical energy. By 1840, several inventors had produced electric motors of varying designs and efficiency. Faraday also discovered that a moving magnetic field causes electric current to flow in a wire. This phenomenon underlies the production of electricity in generators.
  2. Which important discovery did  Oersted make?
    • A magnet causes a current-carrying wire to move.
    • A magnetic field causes an electric current to flow.
    • A electric motor converts electrical energy to mechanical energy
    • A electric current flowing through a wire produce a magnetic field.
  3. Which of the following can be inferred from the passage?
    • A compass needle is magnetic.
    • Electricity and magnetism are related.
    • An electric current produces a magnetic field.
    • An electric motor is based on electromagnetism.
  4. What was a result of the discovery of electromagnetism?
    • the use of steam to power locomotives
    • the use of batteries to produce electrical energy
    • the use of fossil fuels to power internal combustion engines
    • the large-scale generation of electricity by means of moving magnetic fields
Answer:

  1. A single fission reaction produces additional fission reactions.
  2. A electric current flowing through a wire produce a magnetic field.
  3. A compass needle is magnetic.
  4. the large-scale generation of electricity by means of moving magnetic fields






Reference:


Complete Test Preparation for the GED Test 2014 by Steck-Vaughn