By LearningExpress Editors
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
 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?
 5 feet
 10 feet
 15 feet
 20 feet
 If gear 2 turns counterclockwise, which other gear(s), if any, will turn clockwise?
 1 only
 3 only
 3 and 4 only
 1, 3, and 4
 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?
 7:00 A.M.
 7:30 A.M.
 8:00 A.M.
 8:30 A.M.
 A 240pound 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?
 60 feet
 32 feet
 16 feet
 30 feet
 What is the mechanical advantage of the pulley system shown here?
 1
 2
 3
 4
 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?
 96 pounds
 400 pounds
 300 pounds
 200 pounds
 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?
 All three cubes will either float or sink.
 Cube 1 will float and cubes 2 and 3 will sink.
 Cube 3 will float and cubes 1 and 2 will sink.
 Cubes 1 and 2 will float and cube 3 will sink.
 A force of 8 pounds is required to move a spring 4 inches. How much force is required to move the spring 1 foot?
 3 pounds
 12 pounds
 24 pounds
 36 pounds
 A screw has 7 threads per inch. How many full turns are necessary for the nut to travel 3 inches?
 12 turns
 15 turns
 18 turns
 21 turns
 Why is oil added to an engine?
 Engines burn oil.
 Oil helps gasoline burn better.
 Oil increases friction in the engine.
 Oil decreases friction in the engine.
 Using the pulley system shown, how much force is required to lift an 80pound weight?
 20 pounds
 40 pounds
 80 pounds
 160 pounds
 Raising a flag up a flagpole is most commonly accomplished with what simple machine?
 a lever
 a pulley
 an inclined plane
 a gear
 If gear 2 turns clockwise, which other gear(s), if any, will turn clockwise?
 1 only
 3 only
 1 and 3
 none
 In the diagram, Andre wants to lift a 126pound 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?
 126 pounds
 63 pounds
 75 pounds
 144 pounds
 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?
 200 pounds per inch
 300 pounds per inch
 350 pounds per inch
 400 pounds per inch
 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 and 3
 1 and 4
 1, 2, and 5
 1, 3, and 5
 A singlespeed 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?
 90 rpm
 180 rpm
 270 rpm
 360 rpm
 AA block is held in place on a ramp by friction. Which arrow shows the direction of the frictional force?
 A
 B
 C
 D
 If the following items are placed into a hot oven, which will warm most quickly?
 a metal fork
 a plastic spoon
 a ceramic m
 a glass bowl
 Using the pulley system shown in the figure, how much force is required to lift a 300pound weight?
 75 pounds
 100 pounds
 150 pounds
 300 pounds
 A screw can be thought of as a special type of what simple machine?
 the lever
 the inclined plane
 the pulley
 the wheel and axle
 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 57pound block is 6 feet to the left of the pivot point, how far to the right of the pivot point should the 76pound block be placed?
 4.5 feet
 6 feet
 19 feet
 4 feet
 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?
 Ramp A requires less work.
 Ramp B requires less work.
 They require the same amount of work.
 It is impossible to determine.
 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?
 20 rpm, clockwise
 20 rpm, counterclockwise
 40 rpm, clockwise
 40 rpm, counterclockwise
 A 270pound 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?
 30 pounds
 270 pounds
 40 pounds
 144 pounds

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From ASVAB: Power Practice. Copyright © 2010 by LearningExpress, LLC. All Rights Reserved.
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