Use your mouse to click the box next to the most correct answer. If you fail to select the correct answer you must try again until you select the correct answer.

1. One complete sequence of values of strength of an electromagnetic wave as it passes through a point is space is known as what?

   1.   ?    Its frequency
   2.   ?    Its amplitude
   3.   ?    Its cycle
   4.   ?    Its wavelength
   5.   ?    Its period

2. The rate at which work is done or energy expended is known as what?

   1.   ?    Power
   2.   ?    Force
   3.   ?    Mass
   4.   ?    Friction
   5.   ?    Acceleration

3. What does a pound indicate in the English measuring system?

   1.   ?    Acceleration
   2.   ?    Mass
   3.   ?    Friction
   4.   ?    Force
   5.   ?    Velocity

4. A diagram in which symbols are used to show an electrical circuit's components is called a(n) __________.

   1.   ?    Flow diagram
   2.   ?    Ammeter
   3.   ?    Schematic
   4.   ?    Thermocouple
   5.   ?    Resistor

5. The center mass of a ship, around which the ship seems to move, is known as what?

   1.   ?    Its center of buoyancy
   2.   ?    Its apparent weight
   3.   ?    Its absolute weight
   4.   ?    Its relative density
   5.   ?    Its center of gravity

6. What is the name of the instrument used to determine the depth of the water under the hull?

   1.   ?    A passive SONAR
   2.   ?    A towed array
   3.   ?    A fathometer
   4.   ?    A hydrophone
   5.   ?    A dipping SONAR

7. What are ions?

   1.   ?    Atoms with an electrical charge.
   2.   ?    Materials that conduct electrical current easily.
   3.   ?    Fundamental particles with a positive charge commonly found in the nucleus of atoms.
   4.   ?    A nuclear particle with the mass of an electron but opposite charge.
      
   5.   ?    Negatively charged particles that orbits the nucleus of an atom

8. Where does the Commanding Officer of a ship generally go during combat operations?

   1.   ?    The Combat Intelligence Center
   2.   ?    The Air Operations Center
   3.   ?    The Combat Information Center
   4.   ?    The Forecastle
   5.   ?    The Bridge

9. The length of an electromagnetic wave's cycle is known as what?

   1.   ?    Its diffraction
   2.   ?    Its frequency
   3.   ?    Its period
   4.   ?    Its wavelength
   5.   ?    Its amplitude

10. The number of cycles of an electromagnetic wave repeated during one second of time is known as what?

    1.   ?    Its period.
    2.   ?    Its frequency
    3.   ?    Its cycle
    4.   ?    Its wavelength
    5.   ?    Its amplitude

11. True or False: Because sound waves are material waves, the more material there is per unit volume in the medium, the better sound will travel through it.

    1.   ?    False
    2.   ?    True

12. How does temperature of a medium affect sound waves traveling through it?

    1.   ?    The warmer the material, the faster sound waves move through it.
    2.   ?    The warmer the material, the slower the sound waves move through it.
    3.   ?    Temperature does not affect the movement of sound waves through mediums.
    4.   ?    Very cold and very hot mediums transmit sound waves the best.
    5.   ?    The cooler the material, the slower the sound waves move through it.

13. When temperature inversions trap cold air closer to the Earth, conditions can be right for the reflection of radio signals and can cause a significant increase in the distances they can travel. What is this called?

    1.   ?    Refraction
    2.   ?    Diffraction
    3.   ?    Trapping
    4.   ?    Skip distance
    5.   ?    Propagation

14. What is the current term given to all measures used by our forces to use the electronic spectrum despite the enemy's attempts to prevent us from doing so?

    1.   ?    Passive Collection
    2.   ?    Electronic Attack
    3.   ?    Electronic Counter Measures (ECM)
    4.   ?    Electronic Protection (EP)
    5.   ?    Electronic Counter-Counter Measures (ECCM)

15. An ohmmeter measures what?

    1.   ?    The amount of resistance in an electrical circuit.
    2.   ?    The amount of voltage in an electrical circuit.
    3.   ?    The amount of current in an electrical circuit.
    4.   ?    The rate at which alternating current reverses direction.
    5.   ?    The rate at which work is done within an electrical circuit.

16. What historical person concluded that for an object to keep moving, some unbalanced force must act upon it?

    1.   ?    Aristotle
    2.   ?    Galileo Galilei
    3.   ?    Daniel Bernoulli
    4.   ?    Plato
    5.   ?    Sir Isaac Newton

17. Which law of motion states that for every action there is an equal but opposite reaction?

    1.   ?    Newton's Third Law of Motion
    2.   ?    Aristotle's Law
    3.   ?    Newton's First Law of Motion
    4.   ?    Newton's Fourth Law of Motion
    5.   ?    Newton's Second Law of Motion

18. The power or energy exerted against a body in a given direction is known as what?

    1.   ?    Mass
    2.   ?    Velocity
    3.   ?    Acceleration
    4.   ?    Force
    5.   ?    Weight

19. Where would you find the hammer, anvil and stirrup in the human ear.

    1.   ?    In the inner ear
    2.   ?    In the outer ear
    3.   ?    In the cochlea
    4.   ?    Inside the brain
    5.   ?    In the middle ear

20. What is the scientific term used to describe how much of a material is present per unit of its volume?

    1.   ?    Density
    2.   ?    Absolute weight
    3.   ?    Apparent weight
    4.   ?    Newton value
    5.   ?    Buoyancy force

21. Which of the following is a type of Mechanical Wave?

    1.   ?    Television
    2.   ?    Radio
    3.   ?    Infrared
    4.   ?    Sonar
    5.   ?    Radar

22. Which branch of science is concerned with matter, forces and energy?

    1.   ?    Nautical Sciences
    2.   ?    Biological Sciences
    3.   ?    Physical Sciences
    4.   ?    Life Sciences
    5.   ?    Earth Sciences

23. Which of the following defines "Ohm's Law"?

    1.   ?    The voltage in a circuit is directly proportional to the applied current and inversely proportional to the circuit resistance.
    2.   ?    The current in a circuit is inversely proportional to the applied voltage and inversely proportional to the circuit resistance.
    3.   ?    The current in a circuit is directly proportional to the circuit resistance and inversely proportional to the applied voltage.
    4.   ?    The current in a circuit is directly proportional to the applied voltage and directly proportional to the circuit resistance.
    5.   ?    The current in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance.

24. Voltage, or the electromotive force, is best defined as...

    1.   ?    the force that is produced by rubbing two materials together.
    2.   ?    the force that is produced by heating the place where two unlike metals are joined.
    3.   ?    the force that causes electricity to move in a conductor.
    4.   ?    the force that is produced when a conductor moves through a magnetic field.
    5.   ?    the force that is produced by squeezing crystals such as natural quartz.

25. What is a common name for the force of fluid friction?

    1.   ?    Drag
    2.   ?    Weight
    3.   ?    Mass
    4.   ?    Resistance
    5.   ?    Flow

26. If the speed of sound in air is 350 meters per second, and when you yell you hear your echo 4 seconds later, how far away is the object off of which your voice bounced?

    1.   ?    700 meters
    2.   ?    350 meters
    3.   ?    There isn't enough information give to determine the distance.
    4.   ?    4 meters
    5.   ?    1,400 meters

27. Which of the following is NOT a factor affecting the speed of sound underwater?

    1.   ?    Pressure
    2.   ?    Salinity
    3.   ?    Frequency
    4.   ?    Temperature
    5.   ?    All of these are factors that affect the speed of sound underwater

28. The weight of an object in the air, minus the buoyant force acting upon it when it is placed in the water, is known as what?

    1.   ?    Its center of gravity
    2.   ?    Its density
    3.   ?    Its apparent weight
    4.   ?    Its absolute weight
    5.   ?    Its center of buoyancy

29. Which of the following would be a type of special radar?

    1.   ?    Air search radars
    2.   ?    These are all forms of special radars.
    3.   ?    Surface search radars
    4.   ?    Fire control radars
    5.   ?    Height-finding radars

30. Which is the most important factor affecting the speed at which sound waves move through water?

    1.   ?    Temperature
    2.   ?    Salinity
    3.   ?    Decibel level
    4.   ?    Frequency
    5.   ?    Pressure

31. The rate of motion in a given direction is generally called what?

    1.   ?    Newtonian motion
    2.   ?    Velocity
    3.   ?    Vector force
    4.   ?    Acceleration
    5.   ?    Friction

32. What type of mechanical waves cause the medium through which they travel to be displaced back and forth along the path of the wave?

    1.   ?    Transverse
    2.   ?    Longitudinal
    3.   ?    Perpendicular
    4.   ?    Latitudinal
    5.   ?    Oscillator

33. Which of the following would NOT be an example of the use of the principal of Doppler Shift?

    1.   ?    Measuring the speed of a baseball.
    2.   ?    Measuring the speed of a moving car.
    3.   ?    Determining whether a star is moving towards or away from the Earth.
    4.   ?    Determining the direction of motion of a submarine in the ocean.
    5.   ?    Measuring the distance to a sonar contact.

34. Which type of waves require some sort of material in which to travel or propagate?

    1.   ?    Amplitude
    2.   ?    Electromagnetic
    3.   ?    Trapping
    4.   ?    Mechanical
    5.   ?    Medium

35. Electromagnetic waves tend to bend as they reach the higher portions of our atmosphere and increase the distances over which they can be received. What is this effect called?

    1.   ?    Ducting
    2.   ?    Diffraction
    3.   ?    Jamming
    4.   ?    Refraction
    5.   ?    Trapping

36. Foot-pounds are used in the English system of measurement to describe both work and energy. What is the term used in the Metric system for this?

    1.   ?    Watts
    2.   ?    Joules
    3.   ?    Mach
    4.   ?    Neutons
    5.   ?    Amperes

37. Archimedes' Law applies to what substances?

    1.   ?    Solids and gases
    2.   ?    Solids, liquids and gases
    3.   ?    Liquids or gases
    4.   ?    Solids and liquids
    5.   ?    Liquids only

38. The amount of energy or power in a sound wave at any given location is called what?

    1.   ?    Sound voltage
    2.   ?    Doppler effect
    3.   ?    Sound frequency
    4.   ?    Sound intensity
    5.   ?    Sound medium

39. You have an electrical circuit with 3 ohms of resistance and a source voltage of 3 volts. How much current flows in this circuit?

    1.   ?    1/3 amperes
    2.   ?    9 amperes
    3.   ?    1 ampere
    4.   ?    6 amperes
    5.   ?    2 amperes

40. What is the general direction of electron current flow in a closed circuit?

    1.   ?    From negative to positive
    2.   ?    From negative to negative
    3.   ?    From positive to negative
    4.   ?    From positive to positive
    5.   ?    From open to closed

41. Which of the following is the name of an instrument designed to measure voltage in an electrical circuit?

    1.   ?    A primary cell
    2.   ?    An ohmmeter
    3.   ?    A thermocouple
    4.   ?    An ammeter
    5.   ?    A voltmeter

42. The upward force exerted on objects submerged in or floating on a fluid is known as what?

    1.   ?    Resultant force
    2.   ?    Buoyant force
    3.   ?    Center of gravity
    4.   ?    Center of buoyancy
    5.   ?    Apparent weight

43. Which of the conditions below would be best for the stability of a ship?

    1.   ?    A low center of gravity and a high center of buoyancy.
    2.   ?    A high center of gravity and a high center of buoyancy.
    3.   ?    The ship's center of gravity and its center of buoyancy do not have an effect on the ship's stability.
    4.   ?    A high center of gravity and a low center of buoyancy.
    5.   ?    A low center of gravity and a low center of buoyancy.

44. The ratio of a body's speed to the speed of sound in that particular part of the atmosphere is called what?

    1.   ?    Bernoulli's principle
    2.   ?    Vector quantity
    3.   ?    Mach number
    4.   ?    Resultant force
    5.   ?    G-force

45. You have an electrical circuit with 30 volts and a current of 6 amperes. How much resistance is in this circuit?

    1.   ?    5 ohms
    2.   ?    15 ohms
    3.   ?    180 ohms
    4.   ?    .2 ohms
    5.   ?    .5 ohms

46. Electromagnetic waves transmitted in the range from about 5 kHz to 30 GHz are commonly called what?

    1.   ?    Gamma Rays
    2.   ?    Radio waves
    3.   ?    Audible-frequency waves
    4.   ?    X-rays
    5.   ?    Visible light

47. A thermostat relies on which basic method of generating voltage?

    1.   ?    Light
    2.   ?    Pressure
    3.   ?    Magnetism
    4.   ?    Friction
    5.   ?    Heat

48. What is the name of the Law that describes buoyant force?

    1.   ?    Boyle's Law
    2.   ?    Kepler's Law
    3.   ?    Bernoulli's Law
    4.   ?    Newton's Law
    5.   ?    Archimedes' Law

49. What is an electrolyte?

    1.   ?    Any non-metallic substance that conducts electric current in solution.
    2.   ?    An instrument used to measure resistance in an electrical circuit.
    3.   ?    A substance that conducts electric current when light strikes it.
    4.   ?    An instrument used to measure current in an electrical circuit.
    5.   ?    Atoms or groups of atoms that are electrically charged as a result of the loss or gain of electrons.

50. Which law states that a body at rest tends to remain at rest, and a body in motion tends to remain in motion in a straight line, unless an outside force acts on the body.

    1.   ?    Galileo's Law
    2.   ?    Newton's Second Law of Motion
    3.   ?    Aristotle's Law
    4.   ?    Newton's Third Law of Motion
    5.   ?    Newton's First Law of Motion

51. Which of the following is an example of an electromagnetic wave?

    1.   ?    An earthquake
    2.   ?    The sound of a guitar
    3.   ?    Radar
    4.   ?    A tidal wave
    5.   ?    Sonar

52. You have an electrical circuit with 3 ohms of resistance and a current of 6 amperes. How much voltage is in this circuit?

    1.   ?    6 volts
    2.   ?    18 volts
    3.   ?    3 volts
    4.   ?    1.5 volts
    5.   ?    12 volts

53. Which of the following is NOT one of the aerodynamic forces acting on a moving airfoil?

    1.   ?    Lift
    2.   ?    Drag
    3.   ?    Gravity
    4.   ?    Angle of Attack
    5.   ?    Thrust

54. A ________ is a reasoned explanation of observed events, while a _____ is a statement that describes and predicts the future outcome of these events.

    1.   ?    Theory, Law
    2.   ?    Law, Theory
    3.   ?    observation, fundamental
    4.   ?    Law, Hypotheses
    5.   ?    Theory, Hypotheses

55. What takes place every time a force causes motion?

    1.   ?    Work is done
    2.   ?    Schematics are produced
    3.   ?    Power is produced
    4.   ?    Resistance is produced
    5.   ?    Voltage is produced

56. Where is low pressure developed when air moves over a wing?

    1.   ?    Low pressure is not developed, only a high pressure area
    2.   ?    Beneath the wing
    3.   ?    Behind the wing
    4.   ?    In front of the wing
    5.   ?    On top of the wing

57. What do negative sound decibel levels indicate?

    1.   ?    Sounds that are near the bottom range of human hearing.
    2.   ?    There is no such thing as negative sound decibel levels.
    3.   ?    Sounds too faint to be heard without amplification.
    4.   ?    They indicate ultrasound ranges.
    5.   ?    Negative sound decibels levels indicate the level a human ear can stand without pain as the eardrum begins to tear.

58. "Static electricity" is the most common name for which method of generating voltage?

    1.   ?    Chemical action
    2.   ?    Friction
    3.   ?    Pressure
    4.   ?    Magnetism
    5.   ?    Heat

59. Which of the following abbreviations refers to a common type of radar scope?

    1.   ?    ARE
    2.   ?    PPI
    3.   ?    CRT
    4.   ?    CIC
    5.   ?    CDC

60. The audio portion of broadcasts from TV stations use what type of carrier wave modulation?

    1.   ?    Fixed modulation
    2.   ?    Frequency modulation
    3.   ?    Amplitude modulation
    4.   ?    Fluxuating modulation
    5.   ?    Pulse modulation