Free OAR Practice Test 6 – Officer Aptitude Rating Test Prep 2026
Boost your OAR score with Free OAR Practice Test 6 from our series of Six OAR Practice Test , a focused mock test designed to match the actual OAR style and difficulty.
Take this free OAR practice test with 30 carefully designed questions covering all three OAR sections — Math Skills, Reading Comprehension, and Mechanical Comprehension — so you can check your strengths, find weak spots, and improve your speed before exam day. Each question includes a clear explanation to help you understand the method, not just the answer.
This OAR Practice Test is ideal for learners who want realistic practice, better time management, and a strong review of key OAR concepts. Use it as a full-length practice session or section-by-section revision to build confidence and improve accuracy.
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Test Instructions
No. of Questions: 30
Questions: Multiple choice with 4 options (A, B, C, D)
Review: You can flag questions for review and return to them
Submission: Click “Submit Test” when ready to finish.
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Question 1 of 30
1. Question
In a simple circuit, what happens to the current if resistance increases while voltage stays the same?
Correct
By Ohm’s law, current equals voltage divided by resistance; increasing resistance lowers current.
Incorrect
By Ohm’s law, current equals voltage divided by resistance; increasing resistance lowers current.
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Question 2 of 30
2. Question
Compute 3/4 + 2/3.
Correct
Use common denominator 12: 3/4 = 9/12 and 2/3 = 8/12, sum is 17/12.
Incorrect
Use common denominator 12: 3/4 = 9/12 and 2/3 = 8/12, sum is 17/12.
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Question 3 of 30
3. Question
In a passage, the phrase “time is a critical constraint” is used when discussing practice tests. What does “constraint” most nearly mean?
Correct
In this context, a constraint is something that limits you, like a time limit.
Incorrect
In this context, a constraint is something that limits you, like a time limit.
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Question 4 of 30
4. Question
A passage explains the structure of the OAR exam and the topics covered in each section. What is the author’s primary purpose?
Correct
The passage focuses on explaining how the exam is organized, which is descriptive.
Incorrect
The passage focuses on explaining how the exam is organized, which is descriptive.
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Question 5 of 30
5. Question
Grease is applied to moving metal parts in an engine. What is the primary purpose?
Correct
Lubricants like grease reduce friction, which limits wear and overheating.
Incorrect
Lubricants like grease reduce friction, which limits wear and overheating.
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Question 6 of 30
6. Question
A small gear with 12 teeth drives a larger gear with 24 teeth. If the small gear makes 3 rotations, how many rotations does the large gear make?
Correct
The output gear turns in inverse proportion to the number of teeth: fewer teeth turn more, more teeth turn less. The large gear makes 1.5 rotations. Since gear rotations are inversely proportional to tooth count, 12×3=36 teeth pass by, and 36 ÷ 24= 1.5 turns for the larger gear.
Incorrect
The output gear turns in inverse proportion to the number of teeth: fewer teeth turn more, more teeth turn less. The large gear makes 1.5 rotations. Since gear rotations are inversely proportional to tooth count, 12×3=36 teeth pass by, and 36 ÷ 24= 1.5 turns for the larger gear.
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Question 7 of 30
7. Question
A block-and-tackle system uses two pulleys to lift a load. Compared with a single fixed pulley, what is the main advantage?
Correct
Multiple pulleys share the load, so less input force is needed to lift the same weight.
Incorrect
Multiple pulleys share the load, so less input force is needed to lift the same weight.
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Question 8 of 30
8. Question
Two blocks of equal volume are placed in water. Block A sinks and Block B floats. What can you conclude?
Correct
Objects denser than water sink; objects less dense than water float.
Incorrect
Objects denser than water sink; objects less dense than water float.
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Question 9 of 30
9. Question
A handbook originally costs $40 and is discounted by 25%. What is the sale price?
Correct
Twenty five percent of 40 is 10, so 40 – 10 = 30.
Incorrect
Twenty five percent of 40 is 10, so 40 – 10 = 30.
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Question 10 of 30
10. Question
A patrol boat travels at 24 knots. How long will it take to travel 96 nautical miles at this speed?
Correct
Time = distance ÷ speed = 96 nautical miles ÷ 24 knots = 4 hours.
(A knot is defined as one nautical mile per hour, so the units cancel directly.)Incorrect
Time = distance ÷ speed = 96 nautical miles ÷ 24 knots = 4 hours.
(A knot is defined as one nautical mile per hour, so the units cancel directly.) -
Question 11 of 30
11. Question
A passage describes “how consistent daily practice over several weeks leads to better test performance than last-minute cramming”. What is the main idea?
Correct
The passage contrasts daily practice with cramming and concludes that steady practice is more effective.
Incorrect
The passage contrasts daily practice with cramming and concludes that steady practice is more effective.
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Question 12 of 30
12. Question
Solve for x: 4(2x – 3) + 2 = 3(x + 4) + 8.
Correct
Expand: 8x – 12 + 2 = 3x + 12 + 8, so 8x – 10 = 3x + 20. Subtract 3x: 5x – 10 = 20, so 5x = 30 and x = 6.
Incorrect
Expand: 8x – 12 + 2 = 3x + 12 + 8, so 8x – 10 = 3x + 20. Subtract 3x: 5x – 10 = 20, so 5x = 30 and x = 6.
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Question 13 of 30
13. Question
Solve for x: 5x – 3(x + 2) = 2x – 4.
Correct
Expand: 5x – 3x – 6 = 2x – 4, so 2x – 6 = 2x – 4. Subtracting 2x gives -6 = -4, which is false, so there is no solution.
Incorrect
Expand: 5x – 3x – 6 = 2x – 4, so 2x – 6 = 2x – 4. Subtracting 2x gives -6 = -4, which is false, so there is no solution.
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Question 14 of 30
14. Question
A ship’s crew has a ratio of 3 officers to 8 enlisted sailors. If the total crew is 88 people, how many officers are there?
Correct
The ratio parts sum to 3 + 8 = 11. Each part represents 88 / 11 = 8 people. Officers = 3 × 8 = 24.
Incorrect
The ratio parts sum to 3 + 8 = 11. Each part represents 88 / 11 = 8 people. Officers = 3 × 8 = 24.
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Question 15 of 30
15. Question
A piece of equipment originally priced at $250 is marked up by 20%, then later discounted by 20% from the new price. What is the final price compared to the original?
Correct
After a 20% markup, the price is $300. A 20% discount on $300 is $60, giving a final price of $240, which is $10 lower than the original $250.
Incorrect
After a 20% markup, the price is $300. A 20% discount on $300 is $60, giving a final price of $240, which is $10 lower than the original $250.
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Question 16 of 30
16. Question
Pump A can fill a tank in 6 hours, and Pump B can fill the same tank in 9 hours. Working together, how long will it take to fill the tank?
Correct
Combined rate = 1/6 + 1/9 = 3/18 + 2/18 = 5/18 of the tank per hour. Time = 18/5 = 3.6 hours.
Incorrect
Combined rate = 1/6 + 1/9 = 3/18 + 2/18 = 5/18 of the tank per hour. Time = 18/5 = 3.6 hours.
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Question 17 of 30
17. Question
A passage describes how naval officers must master both technical systems and personnel leadership, noting that success in either area alone is insufficient for effective command. What is the main idea?
Correct
The passage explicitly states that mastering one area without the other is insufficient, indicating both are necessary together.
Incorrect
The passage explicitly states that mastering one area without the other is insufficient, indicating both are necessary together.
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Question 18 of 30
18. Question
A passage notes that a ship’s maintenance log showed increasing entries about a particular generator over several months, and that the generator was ultimately replaced. What can be inferred?
Correct
An increasing number of log entries about the same equipment, followed by replacement, suggests ongoing or worsening issues
Incorrect
An increasing number of log entries about the same equipment, followed by replacement, suggests ongoing or worsening issues
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Question 19 of 30
19. Question
In a passage about shipboard discipline, a sentence states that ‘the captain’s directives were unequivocal, leaving no room for misinterpretation.’ What does ‘unequivocal’ most nearly mean?
Correct
Incorrect
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Question 20 of 30
20. Question
A passage explains the historical development of naval radar systems, detailing key inventions and their dates without offering personal opinions. What is the author’s primary purpose?
Correct
The passage presents factual historical information without argument or opinion, which is informative in purpose.
Incorrect
The passage presents factual historical information without argument or opinion, which is informative in purpose.
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Question 21 of 30
21. Question
A 600 N load sits 1 meter from a fulcrum on a lever. How far from the fulcrum must a 200 N force be applied on the other side to balance the load?
Correct
For balance, force × distance must be equal on both sides: 600 × 1 = 200 × d, so d = 600 / 200 = 3 meters.
Incorrect
For balance, force × distance must be equal on both sides: 600 × 1 = 200 × d, so d = 600 / 200 = 3 meters.
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Question 22 of 30
22. Question
A pulley system has 4 rope segments supporting a movable pulley holding a 400 N load. Ignoring friction, what input force is needed to lift the load?
Correct
With 4 supporting segments, the load is divided among them: input force = 400 / 4 = 100 N.
Incorrect
With 4 supporting segments, the load is divided among them: input force = 400 / 4 = 100 N.
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Question 23 of 30
23. Question
Gear A has 18 teeth and drives Gear B, which has 6 teeth. If Gear A rotates at 40 RPM, what is the rotational speed of Gear B?
Correct
Gear speed is inversely proportional to teeth count: Gear B speed = Gear A speed × (teeth A / teeth B) = 40 × (18/6) = 120 RPM.
Incorrect
Gear speed is inversely proportional to teeth count: Gear B speed = Gear A speed × (teeth A / teeth B) = 40 × (18/6) = 120 RPM.
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Question 24 of 30
24. Question
A hydraulic lift has a small piston with an area of 5 cm² and a large piston with an area of 100 cm². If a force of 50 N is applied to the small piston, what force is exerted by the large piston?
Correct
Pascal’s principle gives equal pressure: F1/A1 = F2/A2, so F2 = F1 × (A2/A1) = 50 × (100/5) = 1000 N.
Incorrect
Pascal’s principle gives equal pressure: F1/A1 = F2/A2, so F2 = F1 × (A2/A1) = 50 × (100/5) = 1000 N.
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Question 25 of 30
25. Question
An object has a mass of 600 g and a volume of 500 cm³. Will it float or sink in fresh water (density 1.0 g/cm³), and why?
Correct
Density = mass / volume = 600 / 500 = 1.2 g/cm³, which is greater than water’s density of 1.0 g/cm³, so the object sinks.
Incorrect
Density = mass / volume = 600 / 500 = 1.2 g/cm³, which is greater than water’s density of 1.0 g/cm³, so the object sinks.
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Question 26 of 30
26. Question
Two resistors of 6 ohms and 12 ohms are connected in parallel. What is the total resistance of the combination?
Correct
For parallel resistors: 1/Rtotal = 1/6 + 1/12 = 2/12 + 1/12 = 3/12, so Rtotal = 12/3 = 4 ohms.
Incorrect
For parallel resistors: 1/Rtotal = 1/6 + 1/12 = 2/12 + 1/12 = 3/12, so Rtotal = 12/3 = 4 ohms.
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Question 27 of 30
27. Question
A wrench applies a force of 30 N at a distance of 0.4 meters from a bolt’s center, at an angle of 90 degrees to the wrench. What is the resulting torque?
Correct
Torque = force × distance × sin(angle) = 30 × 0.4 × sin(90°) = 30 × 0.4 × 1 = 12 N·m.
Incorrect
Torque = force × distance × sin(angle) = 30 × 0.4 × sin(90°) = 30 × 0.4 × 1 = 12 N·m.
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Question 28 of 30
28. Question
A ramp 10 meters long rises to a height of 2 meters. What is the mechanical advantage of this inclined plane, ignoring friction?
Correct
For an inclined plane, mechanical advantage equals the length of the ramp divided by its height: 10 / 2 = 5.
Incorrect
For an inclined plane, mechanical advantage equals the length of the ramp divided by its height: 10 / 2 = 5.
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Question 29 of 30
29. Question
A uniform plank rests on a single support exactly at its midpoint and balances horizontally. If a heavy object is placed near one end, what must happen to keep the plank balanced?
Correct
Adding weight to one end shifts the combined center of mass toward that end, so the support point must move in that direction to restore balance.
Incorrect
Adding weight to one end shifts the combined center of mass toward that end, so the support point must move in that direction to restore balance.
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Question 30 of 30
30. Question
A diver descends underwater. As depth increases, what happens to the pressure exerted on the diver, and why?
Correct
Water pressure increases with depth because deeper points have more water above them, increasing the weight of fluid pressing down.
Incorrect
Water pressure increases with depth because deeper points have more water above them, increasing the weight of fluid pressing down.
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