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# Additional Mechanical Comprehension for ASVAB Power Practice Problems

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Updated on Aug 12, 2011

These mechanical comprehension practice questions are based on the actual ASVAB. Take this quiz to see how you would do if you took the exam today and to determine your strengths and weaknesses as you plan your study schedule.

Time: 19 minutes

1. Two blocks of equal weight are suspended by a pulley. The blocks are 10 vertical feet apart. How far must block A be pulled down to be at equal height with block B?
1. 5 feet
2. 10 feet
3. 15 feet
4. 20 feet
2. If gear 2 turns counterclockwise, which other gear(s), if any, will turn clockwise?
1. 1 only
2. 3 only
3. 3 and 4 only
4. 1, 3, and 4
3. Lenny leaves camp at 6:00 A.M. and jogs north at 8 mph. George leaves camp half an hour later and follows the same path as Lenny at 10 mph. At what time will George catch Lenny?
1. 7:00 A.M.
2. 7:30 A.M.
3. 8:00 A.M.
4. 8:30 A.M.
4. A 240-pound block is being pulled up an incline by a pulley. The incline rises 8 feet. Neglecting friction, if 60 pounds of force is necessary to move the block up the incline, how long is the incline?
1. 60 feet
2. 32 feet
3. 16 feet
4. 30 feet
5. What is the mechanical advantage of the pulley system shown here?
1. 1
2. 2
3. 3
4. 4
6. In the diagram, Cory wants to lift a block using a lever. The block is 8 feet from the pivot point and Cory is 12 feet from the pivot point. If it takes 200 pounds of force to lift the block, how much does it weigh?
1. 96 pounds
2. 400 pounds
3. 300 pounds
4. 200 pounds
7. The same type of plastic is used to make blocks of 3 cubes of different sizes. The first has a weight of 0.5 pounds, the second has a weight of 0.75 pounds, and the third has a weight of 1.5 pounds. Which of the following statements is true?
1. All three cubes will either float or sink.
2. Cube 1 will float and cubes 2 and 3 will sink.
3. Cube 3 will float and cubes 1 and 2 will sink.
4. Cubes 1 and 2 will float and cube 3 will sink.
8. A force of 8 pounds is required to move a spring 4 inches. How much force is required to move the spring 1 foot?
1. 3 pounds
2. 12 pounds
3. 24 pounds
4. 36 pounds
9. A screw has 7 threads per inch. How many full turns are necessary for the nut to travel 3 inches?
1. 12 turns
2. 15 turns
3. 18 turns
4. 21 turns
10. Why is oil added to an engine?
1. Engines burn oil.
2. Oil helps gasoline burn better.
3. Oil increases friction in the engine.
4. Oil decreases friction in the engine.
11. Using the pulley system shown, how much force is required to lift an 80-pound weight?
1. 20 pounds
2. 40 pounds
3. 80 pounds
4. 160 pounds
12. Raising a flag up a flagpole is most commonly accomplished with what simple machine?
1. a lever
2. a pulley
3. an inclined plane
4. a gear
13. If gear 2 turns clockwise, which other gear(s), if any, will turn clockwise?
1. 1 only
2. 3 only
3. 1 and 3
4. none
14. In the diagram, Andre wants to lift a 126-pound block using a lever. If the block is 12 feet from the pivot point and Andre is 12 feet beyond that, how much force must he apply to lift the block?
1. 126 pounds
2. 63 pounds
3. 75 pounds
4. 144 pounds
15. The shock absorber on a car is a very large spring. If a car hits a pothole with 500 pounds of force and the shock absorber compresses 2.5 inches, what is its force constant?
1. 200 pounds per inch
2. 300 pounds per inch
3. 350 pounds per inch
4. 400 pounds per inch
16. A cracked pipe, marked in the figure by an ×, has caused all valves to automatically close. Which valves can be opened to allow water to flow from tank A to tank B while avoiding the broken section?
1. 1 and 3
2. 1 and 4
3. 1, 2, and 5
4. 1, 3, and 5
17. A single-speed bicycle has a front gear with 48 teeth and a rear gear with 12 teeth. If the bicycle is pedaled at 90 rpm, how fast will the rear wheel rotate?
1. 90 rpm
2. 180 rpm
3. 270 rpm
4. 360 rpm
18. AA block is held in place on a ramp by friction. Which arrow shows the direction of the frictional force?
1. A
2. B
3. C
4. D
19. If the following items are placed into a hot oven, which will warm most quickly?
1. a metal fork
2. a plastic spoon
3. a ceramic m
4. a glass bowl
20. Using the pulley system shown in the figure, how much force is required to lift a 300-pound weight?
1. 75 pounds
2. 100 pounds
3. 150 pounds
4. 300 pounds
21. A screw can be thought of as a special type of what simple machine?
1. the lever
2. the inclined plane
3. the pulley
4. the wheel and axle
22. In the diagram, Steven wants to balance two blocks on either side of a lever. One block weighs 57 pounds and the other weighs 76 pounds. If the 57-pound block is 6 feet to the left of the pivot point, how far to the right of the pivot point should the 76-pound block be placed?
1. 4.5 feet
2. 6 feet
3. 19 feet
4. 4 feet
23. Two ramps can be used to raise a heavy barrel up to a platform. Neglecting friction, which ramp requires less work to raise the barrel?
1. Ramp A requires less work.
2. Ramp B requires less work.
3. They require the same amount of work.
4. It is impossible to determine.
24. Pulleys A and B are identical in size and connected by a belt. If pulley A rotates at 20 rpm clockwise, at what rate and in what direction will pulley B rotate?
1. 20 rpm, clockwise
2. 20 rpm, counterclockwise
3. 40 rpm, clockwise
4. 40 rpm, counterclockwise
25. A 270-pound block is being pulled up an incline by a pulley. The incline is 36 feet long and rises 4 feet. Neglecting friction, how much force is necessary to move the block up the incline?
1. 30 pounds
2. 270 pounds
3. 40 pounds
4. 144 pounds