PHY 102 Exam 2 Solutions

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PHY 102 Exam 2 Solutions

Which process supplies the energy converted to electrical energy in a nuclear power plant?

  • The release of steam from underground hot springs.
  • The fusion of small nuclei.
  • The fission of large nuclei.
  • The combustion of natural gas.
  • The burning of coal.

 

2

An explosion occurs 3400m away. Given that sound travels at 340 m/s, how long will it take for the sound of the explosion to reach you?

  • less than a second
  • 3 seconds
  • 10 seconds
  • 100 seconds

 

3

When ethanol (empirical formula C2H6O) burns, it combines with oxygen and forms carbon dioxide and water. Which of the following is the balanced chemical reaction for the burning of ethanol?

 

  • C2H6O + O2 →  CO2 + H2O

 

  • C2H6O + 2 O2 → 2 CO2 + 3 H2O

 

  • 2 C2H6O + 3 O2 → 4 CO2 + 6 H2O

 

  • C2H6O + 3 O2 →  2 CO2 + 3 H2O

 

  • C2H6O + 2 O2 →  2 CO2 + 2 H2O

4

When two light nuclei fuse together, mass

 

  • Is conserved.
  • Is converted to energy.
  • Is created from energy.
  • Is increased.

5

Which of the following is an example of a chemical change?

  • An ice cube melting.
  • A sheet of metal being formed into a jewelry box.
  • A candle burning.
  • A window breaking.

6

Sulfur dichloride is a cherry-red liquid. Which of the following is true about sulfur dichloride?

 

  • It is a covalent molecule with one sulfur atom for each two chlorine atoms.
  • It is an ionic compound with one sulfur atom for each two chlorine atoms.
  • It is a covalent molecule with two sulfur atoms for each one chlorine atom.
  • It is an ionic compound with two sulfur atoms for each one chlorine atom.
  • It is a covalent molecule with one sulfur atom for each one chlorine atom.

 

7

Oxygen-16, oxygen-17, and oxygen-18 are:

 

  • Different elements.
  • Different ions.
  • Different isotopes.
  • Different materials

 

8

Which of the following is an example of a compound?

 

  • A neon gas.
  • Table salt crystals.
  • A sample of soil from the yard.
  • A bar of gold.

 

9

An element is characterized by:

 

  • The number of protons in the atom.
  • The mass of the atom.
  • The number of neutrons in the atom.
  • The size of the atom.

10

Which of the following is NOT a physical property?

 

Density

Flammability

Hardness

Melting point

 

11

The primary colors of light are:

 

  • Red, blue, and green
  • Red, yellow, and blue
  • Magenta, cyan, and yellow
  • Green, blue, red and yellow

 

12

In the periodic table, a set of properties repeat from:

 

  • element to element.
  • column to column.
  • row to row.
  • group to group.

 

13

Which of the following statements is true?

 

  • Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.
  • Nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not.
  • Both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction.
  • Neither chemical reaction rates nor nuclear decay rates vary with the conditions of the reaction.

14

What is the ultimate source of all electromagnetic waves?

 

  • Vibrating molecules
  • Radio antennas
  • Light bulbs
  • Vibrating charged particles
  • Vibrating atoms

15

Different components of blood can be separated by their densities in a centrifuge.  This is because blood is:

 

  • A solution
  • A suspension
  • A compound
  • An element
  • A pure substance

16

The reason carbon dating works is that:

 

  • There is so much non-radioactive carbon dioxide in the air.
  • When a plant or animal dies, it stops producing oxygen.
  • Plants and animals are such strong emitters of carbon-14.
  • After a plant or animal dies, it stops taking in fresh carbon-14.

 

17

When two or more waves are at the same place at the same time, which phenomenon occurs?

 

  • Reflection
  • Refraction
  • Dispersion
  • Interference
  • Polarization

18

Which of the following waves is NOT an electromagnetic wave?

 

  • Light
  • X-rays
  • Infrared
  • Radio waves
  • Sound

 

19

The loudness of a sound wave is most closely related to

 

  • The frequency of the vibrations.
  • The wavelength of the wave.
  • The speed of the wave.
  • The amplitude of the vibrations.

20

You perceive the sound of a siren to have a higher frequency when the ambulance is approaching you than when it is receding from you.  Which of the following statements about this observation is true?

 

  • The difference is a figment of your imagination.
  • The difference is due different intensities of the sound.
  • The difference is caused by the mechanical properties of sound.
  • The difference is unique for sound waves and cannot be observed for light.
  • The difference is known as the Doppler Effect.

 

21

If you dip your finger repeatedly into a surface of still water, you create waves. If you dip your finger at a lower rate,

 

  • the higher the frequency and the longer the wavelength.
  • the lower the frequency and the shorter the wavelength.
  • the lower the frequency and the longer the wavelength.
  • the higher the frequency and the shorter the wavelength.

22

When light travels from air into a piece of glass, a change in direction may occur. What is the name of this phenomenon?

 

  • Interference
  • Reflection
  • Dispersion
  • Refraction
  • Polarization

23

Which of the following best describes what must happen for a solution to form?

 

  • A solid must dissolve in a liquid.
  • A substance must dissolve in water.
  • A gas must dissolve in a liquid.
  • A substance must dissolve in another substance.
  • A solid must be heated to its melting point first.

24

Radioactive isotopes can be used:

 

  • As a tracer in a medical test.
  • To determine the age of an archeological artifact.
  • To increase the shelf life of produce.
  • All of the above.

25

Which of the following is not a form of radioactivity?

 

  • Gamma rays
  • X-rays
  • Beta particles
  • Alpha particles

 

26

Which phenomenon of light explains the separation of light into colors in a rainbow?

 

  • Refraction
  • The Doppler effect
  • Polarization
  • Dispersion
  • Interference

27

Atoms consist of:

 

  • Protons and neutrons only.
  • Neutrons and electrons only.
  • Electrons only.
  • Protons, neutrons, and electrons.

 

28

In which of the following types of chemical bond is one or more electron(s) completely transferred from one atom to another?

 

  • Metallic bond
  • Ionic bond
  • Covalent
  • Polarized bond

29

Which of the following is an example of a solution?

 

  • The atmosphere.
  • An Italian salad dressing.
  • Muddy water.

 

30

Which subatomic particle has a negative charge?

 

  • A proton
  • A neutron
  • An alpha particle
  • A gamma ray
  • An electron