GED Section 3 Science

GED Section 3 Science practice questions, page 2 of 3, with answer review and explanations.

Question 6

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
  2. b
  3. c
  4. d
  5. e

Question 7

People wear woolen gloves in the winter because gloves

  1. generate heat energy through radiation.
  2. increase the temperature of cold air through convection.
  3. decrease the loss of body heat to surroundings through insulation.
  4. increase the amount of heat energy generated by the body through conduction.
  5. transform cold wind energy into thermal energy.

Question 8

Different colors of light correspond to different wavelengths. Wavelengths are often quoted in nanometers (nm). The wavelengths of the visible part of the spectrum are shown in the diagram below. According to the diagram, blue-green light would most likely have a wavelength of

  1. 670 nm.
  2. 550 nm.
  3. 350 nm.
  4. 470 nm.
  5. 700 nm.

Question 9

What always stays the same when a chemical reaction takes place?

  1. the number of atoms
  2. the number of molecules
  3. the amount of gas
  4. the amount of solid matter
  5. the amount of disorder

Question 10

Which of the following is NOT true about sunlight?

  1. It is a form of radiation.
  2. It is used as an energy source in solar-powered calculators.
  3. It contains the colors of the rainbow.
  4. Its speed is infinite.
  5. It can be absorbed by plants.