Education.com
Try
Brainzy
Try
Plus

# More Mechanical Comprehension for ASVAB Power Practice Problems

By
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. According to the figure, assuming the board connecting scales 1 and 2 has no weight, how many pounds will scale 1 register?
1. less than 10 pounds
2. 10 pounds
3. more than 10 pounds
4. impossible to determine
2. In the diagram, Todd wants to lift a 50-pound block using a lever. If the block is 18 feet from the pivot point and Todd is 6 feet from the pivot point, how much force must he apply to lift the block?
1. 100 pounds
2. 72 pounds
3. 150 pounds
4. 50 pounds
3. A hot air balloon is able to float because
1. the hot air acts as a jet.
2. hot air is less dense than the outside air.
3. hot air is more dense than the outside air.
4. it is filled with helium.
4. To change a tire, a person is able to take advantage of the mechanical advantage of a jack to lift a car. Each complete turn of the screw raises the car inch. If the handle travels 3 feet per revolution, what is the mechanical advantage of the jack?
1. 12
2. 36
3. 14
4. 44
5. Bryan is strong enough to pull a rope with 150 pounds of force. Using the pulley system shown here, what is the maximum weight he can lift?
1. 50 pounds
2. 300 pounds
3. 450 pounds
4. 600 pounds
6. A wheelbarrow is loaded with 80 pounds of dirt. However, it can be lifted with only 20 pounds of force. What is the mechanical advantage of the wheelbarrow?
1. 1
2. 2
3. 3
4. 4
7. A 360-pound block is being pulled up an incline by a pulley. The incline rises 10 feet. Neglecting friction, if 120 pounds of force is necessary to move the block up the incline, how long is the incline?
1. 30 feet
2. 360 feet
3. 20 feet
4. 20 feet
8. A spring has a force constant of 3 pounds per inch. How much force is required to move the spring 1 foot?
1. 3 pounds
2. 12 pounds
3. 24 pounds
4. 36 pounds
9. Pulley A is three times the diameter pulley B. If pulley A rotates at 45 revolutions per minute (rpm), how fast must pulley B rotate?
1. 15 rpm
2. 45 rpm
3. 90 rpm
4. 135 rpm
10. A block of wood rests on a level surface. What mechanical principle makes it more difficult to push this block sideways if the surface is made of sandpaper than if it is made of glass?
1. centrifugal force
2. gravity
3. wind resistance
4. friction
11. A screw has 6 threads per inch. How many full turns are necessary for the nut to travel 2 inches?
1. 6 turns
2. 12 turns
3. 18 turns
4. 24 turns
12. When you add water to a tank, the water pressure at the top will
1. change with the water depth.
2. decrease.
3. stay the same.
4. increase.
13. What is the mechanical advantage of the pulley system shown here?
1. 1
2. 2
3. 3
4. 4
14. A block made of what material will float on water?
1. metal
2. glass
3. styrofoam
4. rock
15. If gear 1 turns clockwise, which other gear(s), if any, will also turn clockwise?
1. 2 only
2. 3 only
3. 3 and 4 only
4. 2, 3, and 4
16. A handle is connected to the ceiling by a series of springs with force constants of 400, 200, and 100 pounds per inch. When a 200-pound soldier hangs from the handle, how many inches does the platform stretch?
1. 2 inches
2. 2.5 inches
3. 3 inches
4. 3.5 inches
17. Matt leaves his barracks and travels east at 45 mph. At the same time, Phil leaves the same barracks and travels west at 35 mph. After 2 hours, how far away from each other will they be?
1. 20 miles
2. 80 miles
3. 135 miles
4. 160 miles
18. Two men are racing on bicycles. Both have 52-tooth front chain rings. One has a 12-tooth rear cog and the other has a 14-tooth rear cog. If the first bike is being pedaled at 60 rpm, how fast must the other bicycle be pedaled to keep up?
1. 60 rpm
2. 70 rpm
3. 80 rpm
4. 90 rpm
19. Water is flowing into a 20-gallon container through an inlet pipe at a rate of 18 gallons per minute. Water is being evacuated through an outlet at 14 gallons per minute. How much time will it take for the container to overflow?
1. 1 minute
2. 5 minutes
3. 8 minutes
4. 10 minutes
20. In the diagram, James wants to lift a 96-pound block using a lever. If the block is 5 feet from the pivot point and James is 12 feet from the pivot point, how much force must he apply to lift the block?
1. 40 pounds
2. 17 pounds
3. 96 pounds
4. 60 pounds
21. An 800-pound block is being pulled up an incline by a pulley. The incline is 50 feet long and rises 10 feet. Neglecting friction, how much force is necessary to move the block up the incline?
1. 50 pounds
2. 160 pounds
3. 800 pounds
4. 60 pounds
22. Two gears have 12 teeth and 18 teeth. If the larger gear completes two full turns, how many rotations will the smaller gear complete?
1. 1 rotation
2. 1.5 rotations
3. 2 rotations
4. 3 rotations
23. Using the tip of a screwdriver to pry the lid off a paint can is an example of what simple machine?
1. lever
2. pulley
3. inclined plane
4. gear
24. In the diagram, Stevi wants to lift a 70-pound block using a lever. If the block is 9 feet from the pivot point and Stevi is 5 feet beyond that, how much force must she apply to lift the block?
1. 45 pounds
2. 14 pounds
3. 126 pounds
4. 70 pounds
25. Using the pulley system shown here, how much force is required to lift a 150-pound weight?
1. 25 pounds
2. 50 pounds
3. 75 pounds
4. 100 pounds