Question 1

Iron combines with hydrogen to form rust.

Accepted Answer

Rust is formed when iron combines with oxygen in the presence of water or moisture, not hydrogen.

Question 2

Friction can be reduced only by lubrication.

Accepted Answer

Friction can be reduced by several methods besides lubrication, such as polishing surfaces, using ball bearings, or streamlining shapes.

Question 3

When an object is moving, it is static.

Accepted Answer

When an object is moving, it is considered to be in motion, not static. Static implies an object is at rest and not moving.

Question 4

Which automotive component converts mechanical energy to electrical energy?
A)starter
B)generator
C)battery
D)None of the answers is correct.

Accepted Answer

A generator in a vehicle converts mechanical energy into electrical energy, powering the vehicle's electrical systems and recharging the battery.

Question 5

Curb weight is the total weight of the vehicle including the driver, passengers, and cargo.

Accepted Answer

Curb weight refers to the weight of a vehicle without passengers or cargo, but does include the weight of fuel and other standard equipment necessary for normal operation.

Question 6

Torque is expressed in pounds per foot (lbs.-ft).

Accepted Answer

Torque is indeed often expressed in pounds per foot (lbs.-ft) in the United States, indicating the rotational force applied at a distance of one foot from the pivot point.

Question 7

Technician A says materials that absorb fluids are impermeable substances. Technician B says that materials that adsorb fluids are permeable substances
A)A only
B)B only
C)both A and B
D)neither A nor B

Accepted Answer

Materials that absorb fluids are permeable, allowing fluids to pass into their structure, while adsorption is a process where molecules adhere to the surface of a material, not necessarily indicating permeability.

Question 8

The starter motor in an automobile converts electrical energy to _____ energy.
A)chemical
B)thermal
C)mechanical
D)radiant

Accepted Answer

The starter motor in an automobile converts electrical energy from the battery into mechanical energy to turn the engine over, starting the vehicle.

Question 9

All materials have a unique resonant or natural vibration frequency.

Accepted Answer

Every material has a unique resonant or natural vibration frequency due to its atomic and molecular structure, which dictates how it vibrates in response to external energy inputs.

Question 10

A force acting over a large area will exert less pressure per square inch than the same force acting over a smaller area.

Accepted Answer

Pressure is defined as force per unit area. Therefore, if the same force is distributed over a larger area, the pressure (force per unit area) exerted on any point within that area will be less compared to if the force were concentrated over a smaller area.

Question 11

Oxygen exists as a single atom.

Accepted Answer

Oxygen naturally exists as a diatomic molecule (O2), meaning two oxygen atoms are bonded together, not as a single atom.

Question 12

One of the most abundant metals on earth is calcium.

Accepted Answer

Calcium is the fifth most abundant element in the Earth's crust, making it one of the most abundant metals.

Question 13

Technician A says that frequency of a wave or vibration is the number of cycles per second. Technician B says the amplitude of a wave or vibration is the intensity or strength. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. Frequency indeed refers to the number of cycles per second, measured in Hertz (Hz), while amplitude describes the intensity or strength of the wave, often perceived as loudness in sound waves or brightness in light waves.

Question 14

The process that increases the hardness of the outer surfaces of steel while leaving the core relatively soft is called ______.
A)heat treating
B)carburizing
C)anodizing
D)electrolysis

Accepted Answer

Carburizing is a heat treatment process in which iron or steel absorbs carbon while the metal is heated in the presence of a carbon-bearing material, such as charcoal or carbon monoxide. This process increases the hardness of the outer surface of the steel while leaving the core less hard, which is beneficial for parts that need a hard surface to resist wear but require a tough, ductile core to resist impact.

Question 15

When a piece of wood is burned, its energy is destroyed.

Accepted Answer

When a piece of wood is burned, its energy is not destroyed but rather transformed into other forms, such as heat and light, according to the law of conservation of energy.

Question 16

Conduction is the transfer of heat through the movement of a heated object.

Accepted Answer

Conduction is the transfer of heat through a material by direct contact of particles, not through the movement of the heated object itself.

Question 17

Matter can exist as a ______.
A)gas
B)liquid
C)solid
D)All the answers are correct.

Accepted Answer

Matter can exist in three primary states: solid, liquid, and gas, making all the given options correct.

Question 18

Forces are being discussed. Technician A says centrifugal force tends to pull things toward the center of a circle. Technician B says centripetal force tends to push things away from the center of a circle. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Accepted Answer

Centrifugal force is a fictitious force that appears to act on objects moving in a circular path but directs them away from the center. Centripetal force, on the other hand, is the actual force that pulls an object towards the center of its circular path. Therefore, both technicians are incorrect in their descriptions.

Question 19

Blaise  Pascal constructed the first known hydraulic device.

Accepted Answer

Blaise Pascal is credited with inventing the first mechanical calculator, the Pascaline, and for his work on probability theory, but he did not invent the first hydraulic device.

Question 20

When the weight of a wheel and tire assembly is distributed equally around the center of wheel rotation, the wheel and tire have the proper dynamic balance.

Accepted Answer

The answer of When the weight of a wheel and...

Quiz 3: Basic Theories and Math

Iron combines with hydrogen to form rust.

Friction can be reduced only by lubrication.

When an object is moving, it is static.

Which automotive component converts mechanical energy to electrical energy?

Curb weight is the total weight of the vehicle including the driver, passengers, and cargo.

Torque is expressed in pounds per foot (lbs.-ft).

Technician A says materials that absorb fluids are impermeable substances. Technician B says that materials that adsorb fluids are permeable substances

The starter motor in an automobile converts electrical energy to _____ energy.

All materials have a unique resonant or natural vibration frequency.

A force acting over a large area will exert less pressure per square inch than the same force acting over a smaller area.

Oxygen exists as a single atom.

One of the most abundant metals on earth is calcium.

Technician A says that frequency of a wave or vibration is the number of cycles per second. Technician B says the amplitude of a wave or vibration is the intensity or strength. Who is correct?

The process that increases the hardness of the outer surfaces of steel while leaving the core relatively soft is called ______.

When a piece of wood is burned, its energy is destroyed.

Conduction is the transfer of heat through the movement of a heated object.

Matter can exist as a ______.

Forces are being discussed. Technician A says centrifugal force tends to pull things toward the center of a circle. Technician B says centripetal force tends to push things away from the center of a circle. Who is correct?

Blaise Pascal constructed the first known hydraulic device.

When the weight of a wheel and tire assembly is distributed equally around the center of wheel rotation, the wheel and tire have the proper dynamic balance.