# ASVAB Mechanical Comprehension Practice Test 1

Question – 1

1. When an object is moved using casters or bearings,

• A. rolling friction is converted to sliding friction

• B. sliding friction is converted to rolling friction

• C. the object is difficult to move

• D. no friction occurs

Question – 2

2. When water flows from a 3-inch pipe to a 1-inch pipe,

• A. pressure in the 3-inch pipe decreases

• B. pressure in the 1-inch pipe increases

• C. more water flows through the1-inch pipe than the 3-inch pipe

• D. no change occurs in the amount of water passing through the pipes

Question – 3

3. A tank has a base of 4ft x 8ft and holds 3200 pounds of water. The water pressure at the base of the tank will be

• A. 400 lb/ft2

• B. 200 lb/ft2

• C. 600 lb/ft2

• D. 100 lb/ft2

• Answer Explanation:4ft x 8ft = 32ft23200/32= 100 lb/ft2

Question – 4

4. If the speed of a liquid increases, its pressure __________.

• A. increases

• B. decreases

• C. remains constant

• D. increases initially and then gradually decreases

Question – 5

5. When two pulleys are connected by a belt, they will run at same speed only if they are ________.

• A. of the same size

• B. of different sizes

• C. large in size

• D. small in size

Question – 6

6. There are 2 pulleys A and B of diameters 18 inch and 6 inch respectively. If pulley A rotates at a speed of 2400 rpm, what will be the speed of pulley B?

• A. 3600 rpm

• B. 2400 rpm

• C. 7200 rpm

• D. None of the above

• Answer Explanation:speedA x diameterA = speedB x diameterB2400 x 18 = speedB x 6speedB= 2400 x 3 = 7200 rpm.

Question – 7

7. In a system of gears, there are 2 gears having 12 teeth and 36 teeth respectively. If gear A rotates 6 times, how many rotations will gear B make?

• A. 12

• B. 24

• C. 2

• D. 6

• Answer Explanation:The ratio of teeth on gears A and B is 12:36 or 1:3Gear A must rotate 3 times to make gear B rotate once. Therefore, if gear A rotates 6 times, then the gear B will rotate twice.

Question – 8

8. A gas _________ when it is compressed.

• A. warms up

• B. cools down

• C. remains of the same temperature

• D. initially warms up and then gradually cools down

Question – 9

9. Triangular shapes are used for constructing bridges because _________.

• A. they are easy to manufacture

• B. they are flexible

• C. they are attractive

• D. triangles are sturdier than any other shapes

Question – 10

10. An effort arm of length 10 feet and a resistance arm of length 5 feet are used in a first-class lever. The mechanical advantage is ________.

• A. 5

• B. 15

• C. 2

• D. 50

Question – 11

11. ________ is an alloy of copper and steel.

• A. Brass

• B. Bronze

• C. Aluminium

• D. Nickel

Question – 12

12. Steel has a lower critical point of ________.

• A. 623oC

• B. 723oC

• C. 823oC

• D. 923oC

Question – 13

13. If a material is ________ it can easily break with little distortion.

• A. ductile

• B. malleable

• C. brittle

• D. durable

Question – 14

14. _________ space lattice is found in gamma-iron.

• A. Body centred cubic

• B. Face centred cubic

• C. Hexagonal

• D. Triclinic

Question – 15

15. Dead mild steel contains ______ of carbon.

• A. 15%

• B. 1.5%

• C. 2%

• D. 0.15%