Education.com
Try
Brainzy
Try
Plus

# Mechanical Comprehension Questions 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. In the diagram, Vartan wants to balance two blocks on either side of a lever. One block weighs 102 pounds and the other weighs 68 pounds. If the 102-pound block is 6 feet to the left of the pivot point, how far to the right of the pivot point should the 68-pound block be placed?
1. 12 feet
2. 6 feet
3. 4 feet
4. 9 feet
2. Two ramps can be used to raise a heavy barrel up to a platform. Neglecting friction, which ramp requires less force to raise the barrel?
1. ramp A
2. ramp B
3. It requires the same amount of work.
4. It is impossible to determine.
3. If a pulley is attached to the top of a flagpole, what is the mechanical advantage of using the pulley to raise a flag up the pole?
1. 1
2. 2
3. 3
4. 4
4. A force of 4 pounds is required to move a spring 6 inches. How far will the spring stretch under 6 pounds of force?
1. 6 inches
2. 9 inches
3. 12 inches
4. 15 inches
5. Two pipes are used to drain liquid from a 100-gallon barrel. Pipe A is 2 inches in diameter and pipe B is 4 inches in diameter. How much faster does liquid leave the barrel through pipe B compared to pipe A?
1. Liquid leaves both pipes at the same rate.
2. Liquid flows out of pipe B twice as fast.
3. Liquid flows out of pipe B four times as fast.
4. Liquid flows out of pipe B eight times as fast.
6. The type of scale shown in the diagram is based on what simple machine?
1. the lever
2. the pulley
3. the inclined plane
4. the screw
7. Steel battleships are able to float because
1. steel is less dense than water.
2. steel is denser than water.
3. the ship displaces its weight in water.
4. the ship displaces less than its weight in water.
8. If 9 full turns are required to move the nut 0.75 inches, how many threads per inch does the screw have?
1. 10
2. 12
3. 14
4. 16
9. What is the mechanical advantage of the pulley system shown here?
1. 1
2. 2
3. 3
4. 4
10. A cold beverage will stay cold longest in which of the following containers?
1. a glass bottle
2. an aluminum can
3. a plastic bottle
4. a paper cup
11. If gear 3 turns counterclockwise, which other gear(s), if any, will turn clockwise?
1. 1 and 5
2. 2 and 4
3. All will turn clockwise.
4. None will turn clockwise.
12. Pulley B has four times the circumference of pulley A. If pulley A rotates at 60 revolutions per minute (rpm), how fast must pulley B rotate?
1. 15 rpm
2. 30 rpm
3. 60 rpm
4. 240 rpm
13. An object is most likely to slide the farthest on which surface?
1. ice
2. wood
3. dirt
4. rubber
14. A single-speed bicycle has a front chain ring with 54 teeth. The back gear has 12 teeth. If the bicycle is pedaled at 90 rpm, how fast does the rear wheel rotate?
1. 90 rpm
2. 180 rpm
3. 405 rpm
4. 500 rpm
15. A balloon is filled with helium. It is then taken to a special room where the air pressure is decreased. What will happen to the balloon?
1. Its size will increase.
2. Its size will decrease.
3. Its size will stay the same.
4. It will begin to sink.
16. In the diagram, Daniel wants to lift a 225-pound block using a lever. If the block is 4 feet from the pivot point and Daniel is 6 feet beyond that, how much force must he apply to lift the block?
1. 100 pounds
2. 24 pounds
3. 90 pounds
4. 225 pounds
17. Three identical objects are placed on a table in different orientations. Which orientation is most stable?
1. orientation A
2. orientation B
3. orientation C
4. A and C are equally the most stable.
18. A rock is shown to have a density of 10 g/cm3. It is then cut precisely in half. What is the density of the two pieces?
1. 5 g/cm3
2. 8 g/cm3
3. 10 g/cm3
4. 20 g/cm3
19. A 360-pound block is being pulled up an incline by a pulley. The incline is 27 feet long and rises 3 feet. Neglecting friction, how much force is necessary to move the block up the incline?
1. 81 pounds
2. 360 pounds
3. 387 pounds
4. 40 pounds
20. A lead plug is dropped into a beaker containing mercury and water. Mercury is a liquid with a density of 8 g/cm3 and water has a density of 1 g/cm3. If the plug has a density of 10 g/cm3, where will it settle in the beaker?
1. at the bottom of the beaker
2. in the middle of the mercury layer
3. in between the mercury and water layers
4. on top of the water layer
21. Keiko is strong enough to pull a rope with 120 pounds of force. Using the pulley system shown here, what is the maximum weight she can lift?
1. 480 pounds
2. 360 pounds
3. 240 pounds
4. 120 pounds
22. In the diagram, Robert wants to lift a 450-pound block using a lever. If the block is 3 feet from the pivot point and Robert is 9 feet from the pivot point, how much force must he apply to lift the block?
1. 450 pounds
2. 27 pounds
3. 150 pounds
4. 462 pounds
23. Two men are leave checkpoint 1 at the same time in the same direction. One travels at 25 mph and the other at 15 mph. How far apart are they after one hour?
1. 5 miles
2. 10 miles
3. 25 miles
4. 40 miles
24. A 280-pound block is being pulled up an incline by a pulley. The incline is 16 feet long. Neglecting friction, if 70 pounds of force is necessary to move the block up the incline, how tall is the incline?
1. 4 feet
2. 8 feet
3. 16 feet
4. 2.5 feet
25. Maria is strong enough pull a rope with 100 pounds of force. Using the pulley system shown here, what is the maximum weight she can lift?
1. 50 pounds
2. 100 pounds
3. 150 pounds
4. 200 pounds