Mechanical Aptitude Test — Questions and Answers

Question 1: What is the center of gravity of an object?

The point where all the weight can be considered to act (Correct answer)
The geometric center of the object
The bottom of the object
The heaviest part of the object

Correct answer: The point where all the weight can be considered to act

The center of gravity is the point at which the entire weight of an object can be considered to be concentrated. For a uniform object, it coincides with the geometric center; for irregular objects, it depends on mass distribution and may even lie outside the object.

Question 2: A fixed pulley changes the _ of the applied force but NOT the _.

magnitude; direction
speed; force
weight; effort
direction; magnitude (Correct answer)

Correct answer: direction; magnitude

A fixed pulley redirects force (e.g., lets you pull down to lift up) but provides no mechanical advantage — the output force equals the input force.

Question 3: A single-acting hydraulic cylinder extends when pressurized but relies on an external force or spring to retract. Which application is this type of cylinder BEST suited for?

A dump truck bed that gravity will lower after hydraulic lift (Correct answer)
A clamp that must apply force both opening and closing
A steering system requiring equal force in both directions
A two-way door actuator that must push and pull equally

Correct answer: A dump truck bed that gravity will lower after hydraulic lift

Single-acting cylinders only produce force in one direction (extension). A dump truck bed is ideal because hydraulic pressure raises the bed, and gravity alone provides sufficient force to lower it when the valve is opened to release pressure. Applications requiring powered force in both directions need double-acting cylinders.

Question 4: What is a utility knife most commonly used for in mechanical and construction work?

Scoring or cutting soft materials like drywall, cardboard, and plastic sheeting (Correct answer)
Stripping electrical wire insulation
Cutting metal pipes
Carving wood joints

Correct answer: Scoring or cutting soft materials like drywall, cardboard, and plastic sheeting

A utility knife features a retractable, replaceable blade designed for scoring and cutting soft or thin materials such as drywall, cardboard, rope, and plastic sheeting — not hard materials like metal or thick wood.

Question 5: What is the primary factor that causes water to rise in a narrow tube through capillary action?

Temperature
Air pressure
Gravity
Surface tension (Correct answer)

Correct answer: Surface tension

Capillary action is primarily caused by surface tension (cohesion between water molecules) combined with adhesion between the water and tube walls. The adhesive forces pull water up the tube walls, and surface tension keeps the water column connected.

Question 6: A compound pulley system with 4 supporting rope segments has what ideal mechanical advantage?

8
4 (Correct answer)
2
3

Correct answer: 4

The ideal mechanical advantage of a pulley system equals the number of rope segments supporting the load. With 4 supporting segments, the mechanical advantage is 4, meaning you need only one-quarter of the load's weight as input force.

Question 7: When using a tap to cut internal threads, what should be done every half-turn forward?

Apply more cutting oil
Switch to a larger tap size
Increase downward pressure
Reverse a quarter-turn to break the chip (Correct answer)

Correct answer: Reverse a quarter-turn to break the chip

Reversing a quarter-turn periodically breaks the chip, preventing the tap from binding and breaking in the hole.

Question 8: What is the primary purpose of a micrometer?

Measuring angles
Cutting thin materials
Making precise measurements of small dimensions (Correct answer)
Tightening small fasteners

Correct answer: Making precise measurements of small dimensions

A micrometer (or micrometer caliper) is a precision measuring instrument used to measure small dimensions with high accuracy, typically to 0.01 mm or 0.001 inches. It uses a calibrated screw mechanism.

Question 9: What is the function of a governor in a mechanical system?

To increase speed
To automatically regulate speed (Correct answer)
To generate torque
To measure temperature

Correct answer: To automatically regulate speed

A governor automatically regulates the speed of a machine, typically an engine or turbine, by adjusting fuel supply or load in response to speed changes. It maintains a desired operating speed despite varying loads.

Question 10: An object is moving at a constant velocity of 15 m/s. According to Newton's First Law of Motion, which of the following must be true?

The object's acceleration is 15 m/s².
The object will eventually slow down due to inertia.
The net force acting on the object is zero. (Correct answer)
A constant force is required to maintain its velocity.

Correct answer: The net force acting on the object is zero.

Newton's First Law, the law of inertia, states that an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. If the velocity is constant, it means the acceleration is zero. According to Newton's Second Law (F=ma), if acceleration (a) is zero, the net force (F) must also be zero.

Question 11: What is the primary purpose of a center punch before drilling?

To create a starting dimple so the drill bit doesn't wander (Correct answer)
To remove burrs from the surface
To check the hardness of the material
To mark the finished hole depth

Correct answer: To create a starting dimple so the drill bit doesn't wander

A center punch creates a small indentation that guides the drill bit and prevents it from sliding off position.

Question 12: A siphon is used to transfer water from a higher tank to a lower tank. What primarily drives the flow?

Capillary action
Centrifugal force
Surface tension
Atmospheric pressure and gravity (Correct answer)

Correct answer: Atmospheric pressure and gravity

A siphon works because atmospheric pressure pushes fluid up the shorter leg while gravity pulls it down the longer leg, sustaining continuous flow.

Question 13: What is the relationship between action and reaction forces according to Newton's Third Law?

They act on the same object
The reaction is always greater
They are equal in magnitude and opposite in direction (Correct answer)
They cancel each other out

Correct answer: They are equal in magnitude and opposite in direction

Newton's Third Law states that for every action, there is an equal and opposite reaction. These forces are equal in magnitude but opposite in direction, and they always act on different objects.

Question 14: What is the purpose of an accumulator in a hydraulic system?

To store pressurized fluid for later use (Correct answer)
To increase pump speed
To filter the hydraulic fluid
To cool the hydraulic fluid

Correct answer: To store pressurized fluid for later use

An accumulator stores hydraulic fluid under pressure, acting as an energy reserve. It can supplement pump flow during peak demands, absorb pressure shocks, and maintain pressure when the pump is off.

Question 15: Which springs-related statement is FALSE?

None of the above
Springs constant depends on the properties of material they are made of
Springs are a kind of simple machines (Correct answer)
Springs can be used as energy stores

Correct answer: Springs are a kind of simple machines

Springs are not classified as simple machines. Simple machines are basic mechanical devices like levers, pulleys, inclined planes, wheels and axles, wedges, and screws, which change the direction or magnitude of a force. Springs are energy storage devices that deform under load and return to their original shape, converting mechanical energy into potential energy.

Question 16: Which type of pliers features long, narrow jaws angled at the tip, making them ideal for reaching into tight electrical enclosures?

Slip-joint pliers
Bent-nose pliers (Correct answer)
Locking pliers
Channel-lock pliers

Correct answer: Bent-nose pliers

Bent-nose pliers have angled, tapered jaws that allow access to confined spaces and awkward angles commonly found in electrical and electronics work.

Question 17: Water flows upward through a vertical pipe from a lower elevation to one that is 10 feet higher. If the flow velocity stays constant, what happens to the fluid pressure at the higher elevation compared to the lower elevation?

Pressure doubles due to the elevation change
Pressure decreases because the fluid must work against gravity (Correct answer)
Pressure increases because the fluid is moving upward
Pressure stays the same because velocity is unchanged

Correct answer: Pressure decreases because the fluid must work against gravity

According to Bernoulli's equation, total energy (pressure + kinetic + potential) is conserved. When velocity stays constant, the kinetic energy term is unchanged. As the fluid gains potential energy (elevation), it must lose pressure energy — so pressure decreases at the higher point.

Question 18: Water flows through a horizontal pipe at 3 ft/s with a pressure of 40 psi. The pipe then widens, slowing the water to 1 ft/s. According to Bernoulli's principle, what happens to the pressure in the wider section?

Pressure remains the same
Pressure decreases
Pressure drops to zero
Pressure increases (Correct answer)

Correct answer: Pressure increases

Bernoulli's principle states that in a flowing fluid, an increase in velocity corresponds to a decrease in pressure, and vice versa. When the pipe widens and velocity drops from 3 ft/s to 1 ft/s, the pressure must increase to conserve energy.

Question 19: In a closed hydraulic system, if a valve is suddenly shut, the resulting pressure surge is called:

Hydraulic jump
Venturi effect
Water hammer (Correct answer)
Cavitation

Correct answer: Water hammer

Water hammer is the pressure wave created when flowing fluid is suddenly stopped, often heard as a banging in pipes.

Question 20: A pipe with a large diameter connects to a pipe with a small diameter. As water flows from the large pipe into the small pipe, what happens to the flow velocity?

Flow stops
Velocity increases (Correct answer)
Velocity stays the same
Velocity decreases

Correct answer: Velocity increases

According to the continuity equation, when the cross-sectional area decreases the fluid velocity must increase to maintain constant flow rate.

Question 21: Cut depth is determined by

Tool material
Cutting speed
Rigidity of machine tool
All of the above (Correct answer)

Correct answer: All of the above

The depth of cut in a machining operation is determined by several factors working in conjunction. The rigidity of the machine tool ensures stability under cutting forces, allowing for deeper cuts without excessive deflection. The tool material's strength and wear resistance dictate its ability to withstand the stresses of removing material, and cutting speed influences the overall cutting dynamics and tool life, all contributing to the feasible depth of cut.

Question 22: A wheelbarrow is an example of which class of lever?

First-class lever
Third-class lever
Second-class lever (Correct answer)
Not a lever

Correct answer: Second-class lever

A wheelbarrow is a second-class lever because the load is between the fulcrum (wheel) and the effort (handles).

Question 23: In an ideal pin-jointed truss, individual members carry:

Bending moments and transverse shear forces
Torsional (twisting) loads along their length
Only axial forces — either tension or compression (Correct answer)
Distributed lateral pressure loads

Correct answer: Only axial forces — either tension or compression

In an ideal truss with pin connections at joints, no bending moment can be transferred through a pin, so each member carries only axial tension or compression.

Question 24: Which type of stress occurs when a rope is being pulled from both ends?

Torsion
Compression
Tension (Correct answer)
Shear

Correct answer: Tension

Tension is the pulling or stretching force that acts along the length of an object.

Question 25: In a parallel circuit with three resistors of 10Ω, 20Ω, and 30Ω, which resistor carries the most current?

All carry equal current
The 10Ω resistor (Correct answer)
The 20Ω resistor
The 30Ω resistor

Correct answer: The 10Ω resistor

In a parallel circuit, voltage across each branch is equal. By Ohm's law (I = V/R), the resistor with the lowest resistance draws the most current. The 10Ω resistor has the least resistance, so it carries the most current.

Question 26: Which device is used to measure electrical current in a circuit?

Ohmmeter
Voltmeter
Wattmeter
Ammeter (Correct answer)

Correct answer: Ammeter

An ammeter measures current flow (in amperes) and must be connected in series with the circuit.

Question 27: An adiabatic process is one in which:

Pressure remains constant throughout
Volume remains constant throughout
Temperature remains constant throughout
No heat is exchanged between the system and its surroundings (Correct answer)

Correct answer: No heat is exchanged between the system and its surroundings

An adiabatic process has zero heat exchange with the environment; any temperature change results solely from work done on or by the system.

Question 28: A series circuit has the following benefit(s) over a parallel one:

Both A and B (Correct answer)
It is easier to build up
All circuit elements operate at full capacity

Correct answer: Both A and B

Series circuits are generally easier to build due to their simpler wiring, with components connected sequentially (Benefit B). While components in a series circuit share the same current, the statement 'All circuit elements operate at full capacity' (Benefit A) can be interpreted as all elements carrying the full circuit current, unlike parallel circuits where current divides. This uniform current flow through all elements can be considered a form of full capacity in terms of current utilization within the series configuration.

Question 29: A light bulb is rated at 60 watts and operates on 120 volts. What current does it draw?

7200 amperes
60 amperes
2 amperes
0.5 amperes (Correct answer)

Correct answer: 0.5 amperes

Using P = V × I, rearranged to I = P / V = 60 / 120 = 0.5 amperes.

Question 30: Which material property describes its ability to return to its original shape after being deformed?

Ductility
Brittleness
Elasticity (Correct answer)
Hardness

Correct answer: Elasticity

Elasticity is the ability of a material to deform under stress and return to its original shape when the stress is removed.

Question 31: A belt drive system has a driving pulley of 10 cm diameter spinning at 1,800 RPM. If the driven pulley must spin at 600 RPM, what diameter should it be?

60 cm
30 cm (Correct answer)
20 cm
40 cm

Correct answer: 30 cm

For belt drives: D₁ × N₁ = D₂ × N₂. Therefore D₂ = D₁ × N₁ / N₂ = 10 × 1800/600 = 30 cm. The driven pulley must be 3 times larger to turn at 1/3 the speed.

Question 32: A 10 kg box is pushed across a frictionless surface with a net force of 20 N. What is its acceleration?

2 m/s² (Correct answer)
5 m/s²
10 m/s²
1 m/s²

Correct answer: 2 m/s²

Newton's second law: a = F/m = 20 N ÷ 10 kg = 2 m/s².

Question 33: A worker uses a 4-foot crowbar to pry up a heavy crate, placing the fulcrum 1 foot from the load end. If the crate weighs 200 pounds, approximately how much force must the worker apply at the other end?

About 150 pounds
About 100 pounds
About 200 pounds
About 67 pounds (Correct answer)

Correct answer: About 67 pounds

With the fulcrum 1 foot from the load, the effort arm is 3 feet, so the mechanical advantage is 3:1, meaning roughly 67 pounds of effort moves 200 pounds.

Question 34: A hydraulic system is operating normally, but the actuator begins moving slower than specified even though pump flow rate is unchanged. Which fault is MOST likely causing this?

An internal leak has developed in the hydraulic cylinder (Correct answer)
The system filter has been recently replaced with a new element
The relief valve pressure setting is too high
The hydraulic fluid viscosity is too low for the ambient temperature

Correct answer: An internal leak has developed in the hydraulic cylinder

An internal leak in the cylinder (past the piston seals) allows pressurized fluid to bypass from the high-pressure side to the low-pressure side without doing useful work. This reduces the effective flow moving the piston, slowing actuator speed even though the pump is delivering full flow. The other options would not typically cause gradual speed reduction while all other parameters remain normal.

Question 35: When measuring with a micrometer, the thimble has rotated 2.5 revolutions past the 0.200" sleeve mark. Each revolution = 0.025". What is the reading?

0.225"
0.2025"
0.250"
0.2625" (Correct answer)

Correct answer: 0.2625"

2.5 × 0.025" = 0.0625" added to 0.200" = 0.2625" total measurement.

Question 36: What is the primary purpose of a flywheel in a mechanical system?

To store rotational energy and smooth out power delivery (Correct answer)
To increase speed
To reduce friction
To reverse the direction of motion

Correct answer: To store rotational energy and smooth out power delivery

A flywheel stores kinetic energy during power strokes and releases it during dead spots to maintain consistent rotation.

Question 37: Used to easily and firmly grasp sheet metal or round metal stock.

Vise Grips (Plier Wrench) (Correct answer)
Socket wrench
Spark plug wrench
Torx screwdriver

Correct answer: Vise Grips (Plier Wrench)

Vise-Grips, also known as locking pliers or plier wrenches, are versatile hand tools designed to clamp onto objects with adjustable and powerful gripping force. Their locking mechanism allows them to hold sheet metal, round stock, pipes, or other irregularly shaped items firmly in place, freeing the user's hands or providing extra leverage for turning.

Question 38: What is the primary reason pneumatic systems are preferred over hydraulic systems in food processing environments?

Pneumatic systems operate at higher pressures
Pneumatic leaks release clean air rather than contaminating oil (Correct answer)
Pneumatic components are cheaper to manufacture
Pneumatic systems generate more force

Correct answer: Pneumatic leaks release clean air rather than contaminating oil

In food processing, pneumatic systems are preferred because any leaks release only compressed air, eliminating the risk of oil contamination.

Question 39: A pipe is labeled 'Schedule 80.' Compared to Schedule 40 pipe of the same nominal size, Schedule 80 has:

Thicker walls and larger outside diameter
Thicker walls and smaller inside diameter (Correct answer)
Thinner walls and larger inside diameter
Same wall thickness, larger outside diameter

Correct answer: Thicker walls and smaller inside diameter

Higher schedule numbers mean thicker walls; the outside diameter stays the same, so the inside diameter shrinks.

Question 40: The mechanical advantage of a wheel and axle is calculated as:

Wheel circumference × force applied
Wheel radius ÷ axle radius (Correct answer)
Axle diameter × RPM
Axle radius ÷ wheel radius

Correct answer: Wheel radius ÷ axle radius

MA = Wheel radius ÷ Axle radius; the larger the wheel compared to the axle, the greater the mechanical advantage.

Question 41: Pascal's Principle states that pressure applied to an enclosed fluid is:

Absorbed by the container walls
Transmitted equally in all directions throughout the fluid (Correct answer)
Lost as heat energy
Transmitted unequally based on depth

Correct answer: Transmitted equally in all directions throughout the fluid

Pascal's Principle is the basis of hydraulic systems — any pressure applied to a confined fluid is transmitted equally and undiminished to every point in the fluid.

Question 42: What is the function of a diode in an electrical circuit?

Measures resistance
Amplifies the signal
Stores electrical energy
Allows current to flow in only one direction (Correct answer)

Correct answer: Allows current to flow in only one direction

A diode permits current flow in the forward direction and blocks it in the reverse direction, acting as a one-way valve for electricity.

Question 43: What is the purpose of a flywheel in an engine?

To generate electricity
To cool the engine
To increase fuel efficiency
To store rotational energy and smooth out power delivery (Correct answer)

Correct answer: To store rotational energy and smooth out power delivery

A flywheel is a heavy rotating disc that stores rotational kinetic energy. In an engine, it smooths out the intermittent power pulses from the pistons, maintaining more constant rotational speed between firing strokes.

Question 44: If you have two resistors, R1 and R2, connected in parallel, how do you calculate the total equivalent resistance (Rt)?

Rt = R1 + R2
Rt = 1/R1 + 1/R2
Rt = (R1 * R2) / (R1 + R2) (Correct answer)
Rt = R1 - R2

Correct answer: Rt = (R1 * R2) / (R1 + R2)

For two resistors in parallel, the total resistance is the product of the two resistances divided by their sum. The general formula for parallel resistors is 1/Rt = 1/R1 + 1/R2 + ... For only two resistors, this simplifies to Rt = (R1 * R2) / (R1 + R2).

Question 45: Used to file flat surfaces; suitable for usage with most materials.

Try Square
Flat Files (Correct answer)
Triangular Files
Level

Correct answer: Flat Files

Flat files are among the most common types of files, characterized by their rectangular cross-section and parallel cutting surfaces. They are specifically designed for filing flat surfaces, edges, and shoulders on a wide variety of materials, including metal, wood, and plastic. Their broad, flat shape allows for efficient material removal and smoothing over larger areas.

Question 46: What happens to the volume of a gas when its pressure doubles (at constant temperature)?

Volume stays the same
Volume halves (Correct answer)
Volume quadruples
Volume doubles

Correct answer: Volume halves

According to Boyle's Law, at constant temperature, the volume of a gas is inversely proportional to its pressure (P₁V₁ = P₂V₂). Doubling the pressure halves the volume.

Question 47: Two meshed gears have 20 teeth and 60 teeth respectively. If the smaller gear rotates at 300 RPM, how fast does the larger gear turn?

900 RPM
200 RPM
100 RPM (Correct answer)
150 RPM

Correct answer: 100 RPM

The gear ratio is 60:20 or 3:1, so the larger gear turns at 300 divided by 3, which equals 100 RPM.

Question 48: What type of energy is stored in a compressed spring?

Kinetic energy
Chemical energy
Elastic potential energy (Correct answer)
Thermal energy

Correct answer: Elastic potential energy

A compressed spring stores elastic potential energy that can be released when the spring returns to its natural length.

Question 49: A hydraulic jack uses a small piston of area 2 in² and a large piston of area 20 in². If you apply 50 lb of force on the small piston, what force is produced at the large piston?

1000 lb
50 lb
5 lb
500 lb (Correct answer)

Correct answer: 500 lb

Pascal's law states pressure is equal throughout: F_out = F_in × (A_out/A_in) = 50 × (20/2) = 500 lb.

Question 50: In a hydraulic system, if a force of 50 N is applied to a small piston with an area of 0.02 m², what is the pressure transmitted throughout the fluid?

1 Pa
1,000 Pa
2,500 Pa (Correct answer)
50 Pa

Correct answer: 2,500 Pa

According to Pascal's Law, the pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. The pressure (P) is calculated as Force (F) divided by Area (A). Therefore, P = 50 N / 0.02 m² = 2,500 Pascals (Pa). This pressure is the same throughout the entire hydraulic system.

Question 51: Why does a spinning gyroscope resist changes to its orientation?

Air friction stabilizes it
Conservation of angular momentum (Correct answer)
Gravity is reduced while spinning
Centrifugal force pushes outward

Correct answer: Conservation of angular momentum

A spinning gyroscope resists changes to its axis of rotation due to conservation of angular momentum. A torque applied to the gyroscope causes it to precess (slowly rotate around a different axis) rather than simply tipping over.

Question 52: Which type of screwdriver bit is most resistant to cam-out (slipping out under high torque)?

Phillips
Pozidriv
Torx (star) (Correct answer)
Slotted (flat)

Correct answer: Torx (star)

Torx bits engage the fastener with vertical walls that resist cam-out, making them ideal for high-torque applications.

Question 53: What type of flow is characterized by smooth, parallel layers of fluid with no mixing between them?

Chaotic flow
Vortex flow
Turbulent flow
Laminar flow (Correct answer)

Correct answer: Laminar flow

Laminar flow consists of smooth, orderly layers of fluid moving in parallel without mixing. It occurs at low velocities and in fluids with high viscosity. Turbulent flow, by contrast, involves chaotic mixing and eddies.

Question 54: A wheelbarrow is an example of which class of lever?

Second-class lever (Correct answer)
Not a lever
First-class lever
Third-class lever

Correct answer: Second-class lever

A wheelbarrow is a second-class lever because the load is between the fulcrum (wheel) and the effort (handles).

Question 55: A pipe wrench should NOT be used on:

Galvanized steel pipe
Round conduit
Hex-shaped nuts and bolts (Correct answer)
Black iron pipe

Correct answer: Hex-shaped nuts and bolts

Pipe wrenches have serrated jaws designed for round pipe; using them on hex fasteners damages the corners.

Question 56: What is the purpose of a center punch?

To measure hole diameter
To remove pins
To drive nails
To create a starting dimple for drilling (Correct answer)

Correct answer: To create a starting dimple for drilling

A center punch creates a small indentation (dimple) in metal that guides a drill bit to start cutting at the exact desired location. Without a center punch mark, the drill bit tends to wander on smooth surfaces.

Question 57: Tensile stress in a material is defined as:

Internal resisting force per unit area when the material is being pulled apart (Correct answer)
The bending moment divided by section modulus
Force per unit area acting parallel to the cross-section
A twisting force about the long axis

Correct answer: Internal resisting force per unit area when the material is being pulled apart

Tensile stress is the internal force per unit cross-sectional area that resists being stretched or pulled apart along a member's length.

Question 58: What is the primary purpose of a flywheel in an engine?

Store rotational energy to smooth out power pulses (Correct answer)
Increase fuel efficiency
Reduce engine temperature
Control valve timing

Correct answer: Store rotational energy to smooth out power pulses

A flywheel stores kinetic energy during power strokes and releases it between strokes to keep rotation smooth.

Question 59: A tool for plotting or drawing angles (0 to 180 degrees) on a surface.

Hatchet
Wrecking Bar (crowbar)
Protractor (Correct answer)
Soldering Iron

Correct answer: Protractor

A protractor is a common geometric tool used for measuring and drawing angles. It typically has a semicircular or circular shape with degree markings from 0 to 180 (or 360) degrees, allowing for precise angular measurements and constructions on various surfaces.

Question 60: Which of the following components is unique to a hydraulic system and NOT typically found in a pneumatic system?

Valve
Compressor
Cylinder
Reservoir (Correct answer)

Correct answer: Reservoir

Hydraulic systems are typically closed-loop, meaning they reuse the same fluid (oil) continuously. This fluid is stored in a reservoir or tank. Pneumatic systems are often open-loop; they draw air from the atmosphere, compress it, use it, and then exhaust it back to the atmosphere, so they do not require a reservoir for the working fluid. Both systems use cylinders (actuators) and valves.

Question 61: A wheel and axle has a wheel radius of 12 inches and an axle radius of 3 inches. What is its mechanical advantage?

3
9
36
4 (Correct answer)

Correct answer: 4

The mechanical advantage of a wheel and axle equals the wheel radius divided by the axle radius: 12 ÷ 3 = 4.

Question 62: In a simple series circuit, if a 12-volt battery is connected across two resistors of 6 ohms and 3 ohms, what is the total current flowing through the circuit?

2.0 A
4.0 A
0.75 A
1.33 A (Correct answer)

Correct answer: 1.33 A

According to Ohm's Law (V=IR), current (I) is voltage (V) divided by total resistance (R). In a series circuit, the total resistance is the sum of individual resistances (R_total = R1 + R2). So, R_total = 6Ω + 3Ω = 9Ω. The current is then I = 12V / 9Ω = 1.33 A.

Mechanical Aptitude Test

The Mechanical Aptitude Test exam validates essential knowledge and skills required for certification or licensure in this field.

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60 min

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