OAR (Officer Aptitude Rating) Test — Questions and Answers

Question 1: A passage explains that 'regular maintenance prevents equipment failure, which in turn prevents mission failure.' Which statement best paraphrases this idea?

Only certain types of equipment require regular maintenance
Equipment failure is the leading cause of mission failure
Keeping equipment in good condition is essential to mission success (Correct answer)
Maintenance is the most difficult part of naval operations

Correct answer: Keeping equipment in good condition is essential to mission success

The passage establishes a direct chain from maintenance to mission success, which this paraphrase captures accurately.

Question 2: Read: 'Voter turnout in local elections is consistently lower than in national elections. Local governments, however, make decisions about schools, roads, and public safety that directly affect daily life. Civic groups argue that increased local participation would produce more responsive governance.' The main idea is:

National elections are more important than local elections.
Civic groups control local election outcomes.
Roads and schools are the only issues decided by local governments.
Low local election turnout is unfortunate given how directly local decisions affect residents. (Correct answer)

Correct answer: Low local election turnout is unfortunate given how directly local decisions affect residents.

The contrast between low turnout and high local impact is the central tension and message of the passage.

Question 3: If a rectangle's length is doubled and width is halved, how does its area change?

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

Correct answer: It stays the same

New area = (2L)(W/2) = LW = original area; it stays the same.

Question 4: A passage reads: 'Navigation technology has advanced significantly since World War II. Modern GPS systems allow ships to pinpoint their location to within meters.' Which detail is most relevant to the passage's main idea?

The Navy uses many different types of ships
World War II lasted from 1939 to 1945
GPS was originally developed for military purposes
GPS accuracy represents a major technological advancement in navigation (Correct answer)

Correct answer: GPS accuracy represents a major technological advancement in navigation

The GPS accuracy detail directly supports the central claim about significant advances in navigation technology.

Question 5: A lever is 10 feet long with the fulcrum 2 feet from the load end. If a 400 lb load is placed on the short end, how much force is needed on the long end to balance it?

150 lb
300 lb
200 lb
100 lb (Correct answer)

Correct answer: 100 lb

Using the lever principle: 400 × 2 = F × 8, so F = 100 lb.

Question 6: Evaluate: 18 − 3 × (4 + 2) ÷ 6

15 (Correct answer)
9
12
16

Correct answer: 15

Following order of operations: 3 × 6 = 18, 18 ÷ 6 = 3, then 18 − 3 = 15.

Question 7: A spring with a constant of 30 lb/in is compressed 4 inches. How much potential energy is stored in the spring?

60 in-lb
240 in-lb (Correct answer)
480 in-lb
120 in-lb

Correct answer: 240 in-lb

Spring energy = ½kx² = ½ × 30 × 4² = 240 in-lb.

Question 8: A hanging sign is supported by two cables: one horizontal and one at 60° above horizontal. If the sign weighs 120 N, what is the tension in the angled cable?

104 N
60 N
120 N
138.6 N (Correct answer)

Correct answer: 138.6 N

Vertical equilibrium: T sin 60° = 120 N → T = 120/0.866 ≈ 138.6 N.

Question 9: Which of the following best describes a force couple?

Two equal forces acting in the same direction
A single force that creates linear motion
Two forces that cancel each other out with no rotation
Two equal and opposite forces that produce rotation (Correct answer)

Correct answer: Two equal and opposite forces that produce rotation

A couple consists of two equal, opposite, non-collinear forces that produce pure rotation (torque) with no net linear force.

Question 10: Which of the following best describes the primary function of a fuse in an electrical circuit?

To increase the voltage for connected devices.
To protect the circuit from excessive current. (Correct answer)
To store a small amount of electrical charge.
To convert direct current (DC) to alternating current (AC).

Correct answer: To protect the circuit from excessive current.

A fuse is a safety device containing a wire designed to melt and break the circuit if the current exceeds a safe level. This sacrificial action protects the circuit's components from damage due to overcurrents or short circuits.

Question 11: An angle measures 137°. What is the measure of its supplement?

223°
47°
53°
43° (Correct answer)

Correct answer: 43°

Supplementary angles sum to 180°; 180° − 137° = 43°.

Question 12: A block and tackle system with 3 movable pulleys and 3 fixed pulleys has approximately what mechanical advantage?

12
9
6 (Correct answer)
3

Correct answer: 6

A block and tackle with 3 movable pulleys provides a mechanical advantage of 6 (twice the number of movable pulleys).

Question 13: A passage reads: 'The treaty obligated signatory nations to share intelligence regarding maritime threats, though participation remained voluntary in practice.' What tension does the passage identify?

Between treaty signatories and non-signatory nations
Between naval and air forces within signatory nations
Between formal obligations and the voluntary nature of actual participation (Correct answer)
Between classified and unclassified intelligence categories

Correct answer: Between formal obligations and the voluntary nature of actual participation

The passage highlights a contradiction: nations are formally obligated by the treaty but participation is voluntary in practice.

Question 14: A passage states: 'Coral reefs, though covering less than one percent of the ocean floor, support approximately 25 percent of all marine species.' What can be inferred from this?

Most marine species live in open water
Marine species avoid deep water
Coral reefs are disproportionately rich in biodiversity (Correct answer)
Ocean floors are mostly uninhabited

Correct answer: Coral reefs are disproportionately rich in biodiversity

A tiny area supporting a quarter of all marine species demonstrates that coral reefs have disproportionately high biodiversity.

Question 15: What does a capacitor do in a DC circuit once fully charged?

Increases current
Acts as a resistor
Allows full current to flow
Blocks current flow (Correct answer)

Correct answer: Blocks current flow

A fully charged capacitor blocks DC current because its electric field opposes additional charge movement.

Question 16: What is the purpose of a fuse in an electrical circuit?

Protect against excessive current (Correct answer)
Reduce resistance
Store electrical energy
Increase voltage

Correct answer: Protect against excessive current

A fuse contains a wire that melts and breaks the circuit when current exceeds a safe level, preventing damage.

Question 17: Read the passage: 'Contrary to popular belief, medieval Europeans did not commonly believe the Earth was flat. Ancient Greek calculations of Earth's circumference were well known to educated medieval scholars, and navigational practices of the era relied on the assumption of a spherical Earth.' The author's tone in this passage is best described as:

Highly critical of modern education
Nostalgic for the medieval period
Corrective, addressing a common misconception (Correct answer)
Indifferent to historical accuracy

Correct answer: Corrective, addressing a common misconception

The author directly counters a popular misconception by presenting historical evidence that medieval scholars understood Earth was round.

Question 18: Simplify: (x³)² ÷ x²

x⁴ (Correct answer)
x³
x⁵
x⁶

Correct answer: x⁴

(x³)² = x⁶, then x⁶ ÷ x² = x⁴.

Question 19: If 5 technicians can service 15 aircraft in 3 days, how many technicians are needed to service 36 aircraft in 4 days?

6
9 (Correct answer)
10
8

Correct answer: 9

Rate = 15 / (5 x 3) = 1 aircraft per technician-day; tech-days needed = 36; technicians = 36 / 4 = 9.

Question 20: A fixed pulley is attached to the ceiling to lift a load. What is the primary advantage of this single fixed pulley?

It doubles the mechanical advantage
It changes the direction of the applied force (Correct answer)
It halves the distance the rope must be pulled
It reduces friction to zero

Correct answer: It changes the direction of the applied force

A single fixed pulley provides a mechanical advantage of only 1 but allows the user to pull downward instead of lifting upward.

Question 21: A supporting detail differs from the main idea because a supporting detail:

Provides specific evidence, examples, or facts that back up the main idea. (Correct answer)
Is stated in the title of the passage.
Is always more interesting than the main idea.
Can replace the main idea if it is compelling enough.

Correct answer: Provides specific evidence, examples, or facts that back up the main idea.

Supporting details exist to explain, prove, or illustrate the main idea, not to serve as the central point themselves.

Question 22: Read: 'Naval exercises are conducted to assess readiness, identify weaknesses, and train personnel under realistic conditions. The results inform future procurement decisions.' What is the PRIMARY purpose of naval exercises according to the passage?

To assess readiness and improve training (Correct answer)
To test new weapons systems
To demonstrate power to adversaries
To justify defense budgets

Correct answer: To assess readiness and improve training

The passage explicitly lists assessing readiness, identifying weaknesses, and training personnel as the purposes of naval exercises.

Question 23: A tank is filled with water to a height of 5 meters. What is the approximate gauge pressure at the bottom of the tank? (Use g = 9.8 m/s²)

98,000 Pa
49,000 Pa (Correct answer)
4,900 Pa
490 Pa

Correct answer: 49,000 Pa

Gauge pressure equals ρgh = 1000 × 9.8 × 5 = 49,000 Pa.

Question 24: Two identical 10Ω resistors are connected in parallel. What is the combined resistance?

2.5Ω
10Ω
20Ω
5Ω (Correct answer)

Correct answer: 5Ω

Two identical resistors in parallel produce half the resistance of one: 10/2 = 5Ω.

Question 25: A doorknob is an example of which simple machine?

Wedge
Screw
Lever
Wheel and axle (Correct answer)

Correct answer: Wheel and axle

A doorknob is a wheel and axle — the knob is the wheel (large radius) and the spindle is the axle (small radius).

Question 26: How many of the gears created in March and April weren't of a high standard?

5,000
6,000
15,000
11,000 (Correct answer)

Correct answer: 11,000

To determine the total number of gears that weren't of a high standard in March and April, one would need the specific production figures for each month and the corresponding number or percentage of unsatisfactory gears. The calculation would involve finding the number of unsatisfactory gears for March and for April, and then summing those two figures to arrive at the total.

Question 27: A wedge is used to split a log. If you double the length of the wedge while keeping the same width, what happens to its mechanical advantage?

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

Correct answer: It doubles

Mechanical advantage of a wedge = length / width, so doubling the length doubles the mechanical advantage.

Question 28: Read the passage: 'Every time the school board meeting ran past 9 p.m., community attendance dropped significantly the following month.' What inference is best supported by this observation?

The board's decisions were unpopular with most community members.
Late meeting end times discouraged residents from returning in subsequent months. (Correct answer)
Community members are willing to attend meetings only when topics interest them.
The school board intentionally scheduled long meetings to limit participation.

Correct answer: Late meeting end times discouraged residents from returning in subsequent months.

The consistent pattern of late meetings followed by lower attendance implies that the long hours deterred people from coming back.

Question 29: A submarine descends from 100 ft to 200 ft below sea water. What happens to the pressure on its hull?

Pressure doubles
Pressure stays the same
Pressure increases but does not double because surface pressure already exists (Correct answer)
Pressure halves

Correct answer: Pressure increases but does not double because surface pressure already exists

Total pressure = atmospheric + hydrostatic; doubling depth doubles only the hydrostatic component, so total pressure increases but does not double.

Question 30: What is the value of 5! (5 factorial)?

120 (Correct answer)
24
60
720

Correct answer: 120

5! = 5 × 4 × 3 × 2 × 1 = 120.

Question 31: Solve for y: 4y + 12 = 36

7
5
6 (Correct answer)
4

Correct answer: 6

4y = 36 − 12 = 24; y = 24 / 4 = 6.

Question 32: A wrench slips off a bolt head because the wrench opening is slightly too large. This is most likely to cause:

The bolt head to round off (strip) (Correct answer)
No damage if turned slowly
The wrench handle to bend
The bolt to over-tighten

Correct answer: The bolt head to round off (strip)

An oversized wrench rocks on the corners of the bolt head, shearing them off and rounding the head.

Question 33: What is 2³ × 2²?

32 (Correct answer)
16
64
8

Correct answer: 32

When multiplying same-base exponents, add the exponents: 2^(3+2) = 2⁵ = 32.

Question 34: If the last paragraph of a passage begins with 'In conclusion' or 'Ultimately,' it most likely contains:

An unrelated anecdote.
A new argument that contradicts the rest of the passage.
A list of vocabulary definitions.
A restatement or summary of the main idea. (Correct answer)

Correct answer: A restatement or summary of the main idea.

Concluding signal words typically introduce a summary or restatement of the main idea.

Question 35: Read: 'The regulation was amended three times before reaching its final form, each revision narrowing the scope of permissible exceptions.' What happened to permissible exceptions over successive revisions?

They remained unchanged throughout the amendment process
They decreased as the scope was progressively narrowed (Correct answer)
They increased in number with each revision
They were eliminated entirely after the first revision

Correct answer: They decreased as the scope was progressively narrowed

Each revision 'narrowed the scope of permissible exceptions,' meaning fewer exceptions were allowed over time.

Question 36: Which of the following simple machines is fundamentally an inclined plane wrapped around a cylinder?

Lever
Wedge
Pulley
Screw (Correct answer)

Correct answer: Screw

A screw is defined as an inclined plane wrapped helically around a central axis or cylinder. The threads of the screw act as the inclined plane, converting rotational force (torque) into a linear force along the screw's axis.

Question 37: A hydraulic press has a small piston with an area of 2 sq in and a large piston with an area of 20 sq in. If a force of 15 lb is applied to the small piston, what force is exerted by the large piston?

300 lb
150 lb (Correct answer)
75 lb
30 lb

Correct answer: 150 lb

By Pascal's principle, force is multiplied by the area ratio: 15 × (20/2) = 150 lb.

Question 38: A block rests on a ramp inclined at 30°. Which component of gravity acts parallel to the ramp surface?

mg / sin 30°
mg tan 30°
mg sin 30° (Correct answer)
mg cos 30°

Correct answer: mg sin 30°

The component of gravity parallel to the incline equals mg sin θ, which drives the block down the slope.

Question 39: Two aircraft leave the same base at the same time, one flying north at 300 mph and the other flying east at 400 mph. How far apart are they after 2 hours?

700 miles
1,200 miles
1,000 miles (Correct answer)
900 miles

Correct answer: 1,000 miles

After 2 hours they are 600 miles and 800 miles apart respectively, and √(600² + 800²) = √1,000,000 = 1,000 miles.

Question 40: If 3(x - 2) = 2(x + 5), what is the value of x?

6
4
16 (Correct answer)
8

Correct answer: 16

Distribute to get 3x - 6 = 2x + 10, then subtract 2x and add 6 to both sides giving x = 16.

OAR (Officer Aptitude Rating) Test

The OAR (Officer Aptitude Rating) Test exam validates essential knowledge and skills required for certification or licensure in this field.

Questions

60 min

Time Limit

60%

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