Free Plant Operator Selection System Practice Test

Reading Comprehension

Questions 1-5 pertain to the following passage:


Comets are bodies that orbit the sun. They are distinguishable from asteroids by the presence of coma or tails. In the outer solar system, comets remain frozen and are so small that they are difficult to detect from Earth. As a comet approaches the inner solar system, solar radiation causes the materials within the comet to vaporize and trail off the nuclei. The released dust and gas forms a fuzzy atmosphere called the coma, and the force exerted on the coma causes a tail to form, pointing away from the sun.

Comet nuclei are made of ice, dust, rock and frozen gases and vary widely in size: from 100 meters or so to tens of kilometers across. The comas may be even larger than the Sun. Because of their low mass, they do not become spherical and have irregular shapes.

There are over 3,500 known comets, and the number is steadily increasing. This represents only a small portion of the total comets existing, however. Most comets are too faint to be visible without the aid of a telescope; the number of comets visible to the naked eye is around one a year. Comets leave a trail of solid debris behind them. If a comet's path crosses the Earth's path, there will likely be meteor showers as Earth passes through the trail of debris.

Many comets and asteroids have collided into Earth. Some scientists believe that comets hitting Earth about 4 billion years ago brought a significant proportion of the water in Earth's oceans. There are still many near-Earth comets.

Most comets have oval shaped orbits that take them close to the Sun for part of their orbit and then out further into the Solar System for the remainder of the orbit. Comets are often classified according to the length of their orbital period: short period comets have orbital periods of less than 200 years, long period comets have orbital periods of more than 200 years, single apparition comets have trajectories which cause them to permanently leave the solar system after passing the Sun once.

1. What does the passage not list as a component of comet nuclei?

a. solar radiation
b. dust
c. frozen gases
d. rock

2. According to the passage, what do some scientists believe brought a significant proportion of the water in the Earth's oceans?

a. Comets' released gas and dust
b. Comets exiting in the solar system
c. Comet collisions with the Sun
d. Comet collisions with Earth

3. What does the passage claim distinguishes comets from asteroids?

a. The make-up of their nuclei
b. The presence of coma or tails
c. Their orbital periods
d. Their irregular shapes

4. What would a comet with an orbital period of 1,000 years be called? a. a short period comet
b. a long period comet
c. a single apparition comet
d. an elliptical comet

5. According to the passage, which of the following is true?

a. There are 350 known comets and the number is steadily increasing.
b. There are 3,500 known comets and the number is staying the same.
c. There are 3,500 known comets and many more comets that aren't known.
d. Most comets are visible to the naked eye.

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Mathematical Usage

Use the following information to answer questions 6-10:

1 acre = 43,560 square feet
1 barrel = 42 gallons
1 fathom = 6 feet
1 foot = 12 inches
1 furlong = 40 rods
1 gallon = 3.785 liters
1 gallon = 4 quarts
1 hand = 10 centimeters
1 inch = 2.54 centimeters
1 kilogram = 1,000 grams
1 kilogram = 2.2 pounds
1 kilometer = 1,000 meters
1 mile = 1.609 kilometers
1 mile = 5,280 feet
3 mile/hour = 4.4 feet/second
1 pint = 4 gills
1 pound = 16 ounces
1 quart = 2 pints
1 slug = 14.59 kilograms
1 square mile = 640 acres

1. 6 kilograms = ? pounds

a. 2.205
b. 6,000
c. 15.24
d. 13.23

2. 4 furlongs = ? rods

a. 160
b. 10
c. 40
d. 0.1

3. 80 ounces = ? pounds

a. 5
b. 16
c. 8
d. 10

4. 3 acres = ? square feet

a. 43,560
b. 1,920
c. 130,680
d. 640

5. 2 miles = ? kilometers

a. 1.609
b. 3.218
c. 1.243
d. 2.486


In this portion of the exam test takers need to figure out how an object would look after being properly assembled. The first picture in each problem displays all the parts that need to be assembled. The next five illustrations display five different methods of assembly, four of which are wrong, and one of which is right.

Every part has at least one letter marking it; some have more than one. Each letter represents a place on the assembled part. Some letters are also shown that correspond to unseen areas. These are displayed with a dotted line that points to the side underneath, or the unseen area.

Mechanical Concepts

1. Objects 1 and 2 are submerged in separate tanks, both filled with water. In which tank (A or B) will the water level be the highest? (If equal, mark C)

2. If ball 1 and ball 2 are of equal weight and moving at the same speed, in which direction (A, B, or C) will ball 1 tend to go when it collides with ball 2 at point X?

3. In which direction (A or B) will gear 5 spin if gear 1 is spinning counter-clockwise? (If both, mark C)

4. Which of the two identical objects (A or B) will launch a higher distance when the springs are released? (If equal, mark C)


Solve the five problems in the second table, based on the information in the first table.


Use the information in the graph to answer the four multiple choice questions in the table under it:


Reading Comprehension

1. A: Solar radiation is not listed as a component of comet nuclei.

2. D: The passage's 5th paragraph notes that some scientists believe that comet collisions with Earth brought a large proportion of Earth's water.

3. B: The second sentence in the passage notes that comets are distinguishable from asteroids by the presence of comas or tails.

4. B: A comet with an orbit of longer than 200 years is a long period comet.

5. C: The third paragraph notes that there are over 3,500 known comets. It also notes that this represents only a small portion of those in existence.

Mathematical Usage

1. D: 13.23 pounds

2. A: 160 rods

3. A: 5 pounds

4. C: 130,680 square feet

5. B: 3.218 kilometers



Mechanical Concepts

1. B
2. A
3. A
4. B


1. B
2. C
3. A
4. C
5. D


1. C
2. C
3. A
4. D


Last Updated: 04/18/2018

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