ASVAB ASVAB Certifications ASVAB-SECTION-3 Questions & Answers

• Question 91:

  When meshing or interlocking gears have different numbers of teeth, __________.

  A. relative speeds depend on the speed of the drive aide for both

  B. both gears will rotate at the same speed

  C. the gear with more teeth will rotate fester than the gear with fewer teeth

  D. the gear with fewer teeth will rotate fester than the gear with more teeth

  Correct Answer: D

  When meshing or interlocking gears have different numbers of teeth, the gear with fewer teeth will rotate

  faster than the gear with more teeth.

  If two gears are meshed, both cannot be driven or something will break – one must be driving and one

  must be driven.

• Question 92:

  A compound machine is one in which __________.

  A. a battery provides the force

  B. one simple machine rotates around the second one

  C. two or more simple machines work together

  D. the mechanical advantages can be made to balance each other out

  Correct Answer: C

  A compound machine is one in which two or more simple machines work together.

• Question 93:

  The mechanical advantage of two meshing gears is calculated by dividing __________.

  A. the number of teeth on the driving gear by the number of teeth on the driven gear.

  B. the number of teeth on the driven gear by the number of teeth on the driving gear.

  C. the number of teeth on the driving gear by the rotational speed.

  D. the diameter of the driven gear by the number of teeth on the driving gear.

  Correct Answer: B

  The mechanical advantage of two meshing gears is calculated by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.

• Question 94:

  The amount that a machine (simple or complex) multiplies your force or effort is called __________.

  A. load distance

  B. mechanical advantage

  C. resistance effect

  D. acceleration

  Correct Answer: B

  The amount that a machine (simple or complex) multiplies your force or effort is called mechanical

  advantage.

  Load distance is how far the load moves when force is applied, and acceleration is the change in velocity

  or speed in a certain direction.

• Question 95:

  Kinetic energy is __________.

  A. energy stored in chemicals, such as in a battery.

  B. energy in moving electrons, as in an electric current.

  C. energy in a moving object.

  D. energy that can be released under certain conditions.

  Correct Answer: C

  Kinetic energy is energy in a moving object.

  Energy stored in chemicals, such as in a battery, is chemical energy; energy in moving electrons, as in an

  electric current, is electric energy; and energy that can be released under certain conditions is potential

  energy.

• Question 96:

  For two gears to mesh properly, they must __________.

  A. rotate at the same speed

  B. rotate in the same direction

  C. have the same size teeth

  D. have the same number of teeth

  Correct Answer: C

  For two gears to mesh properly, they must have the same size teeth.

  Different size gears will, by definition, rotate at different speeds even when their driving axles are moving at

  the same speed.

  Also, interlocking or meshing gears rotate in opposite directions.

• Question 97:

  If Block A, on which the lever is resting, is moved farther away from Block B __________.

  

  A. it will be harder to lift Block B but it will go higher

  B. it will be easier to lift Block B and it will go higher

  C. it will be harder to lift Block B and it will not be lifted to the same height

  D. it will be easier to lift Block B but it will not be lifted as high

  Correct Answer: A

  It will be harder to lift Block B but it will go higher. If Block A under the beam serving as the lever is moved away from Block B on top of the lever beam, the moment for the force exerted will increase, since the fulcrum is now closer to the force; this will make Block B harder to lift. However, the height to which Block B on the end of the lever beam can be raised increases the further away Block A is moved from Block B.

• Question 98:

  When you heat water that is confined in a closed container so that the steam cannot escape, the pressure inside the container __________ and the temperature of the boiling water __________.

  A. increases, decreases

  B. increases, increases

  C. decreases, decreases

  D. decreases, increases

  Correct Answer: B

  Heating an enclosed container of boiling water increases the pressure of the water vapor (steam) inside the container and increases the temperature of the water.

• Question 99:

  Which pendulum takes less time to make one complete back-and-forth swing?

  

  B. Y

  C. Both take the same amount of time.

  D. There is not enough information to calculate the answer.

  Correct Answer: B

  The length of time it takes for one all back and forth swing depends on the length of the string, not the weight at the end of it.

• Question 100:

  When forces act in pairs they are ___________.

  A. equal in magnitude and opposite in direction

  B. equal in magnitude and in the same direction

  C. equal in magnitude

  D. unequal in magnitude

  Correct Answer: A

  Since it is impossible to have one force unless it acts as one of a pair of forces, it means that these forces must be equal in magnitude and opposite in direction.