# Qualifying Exam For Instructors - Part 3 - Science

29 Questions  Settings  The series of examinations you are about to take tests your stock knowledge on general subjects. These exams contain questions based on the following subjects: Language Proficiency, Math, Science, Reading Comprehension, Abstract Reasoning, and Essay Writing. Cheating is NOT allowed. You should not seek help from anyone or use any form of technology to find the answer. You are not allowed to retake the exam.

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• 1.
Chad is using an electronic balance to find the weight of an apple. He makes three trials and gets the following values: 30.8 g, 31.2 g, and 30.9 g. However, his teacher later announces that the weight of the apple is exactly 24.7 g. Chad’s measurements are _____.
• A.

Accurate and precise

• B.

Accurate but not precise

• C.

Precise but not accurate

• D.

Neither precise nor accurate

• 2.
Where does light travel fastest?
• A.

Air

• B.

Glass

• C.

Vacuum

• D.

Water

• 3.
A complete rotation about the Earth’s axis takes _____.
• A.

A day

• B.

A week

• C.

A month

• D.

A year

• 4.
What is the difference between an earthquake’s intensity and magnitude?
• A.

Intensity is based on the degree of destruction while magnitude is based on the perceptability of the shock.

• B.

Intensity is based on the perceptability of the shock while magnitude is based on the degree of destruction.

• C.

Intensity is based on the perceptability of the shock, while magnitude is based on the amount of energy released.

• D.

Intensity is based on the amount of energy released, while magnitude is based on the perceptability of the shock.

• 5.
According to Mohs scale of hardness, gold has a hardness of 2.5, a knife blade has a hardness of 5.5, and glass has a hardness of 7. Which of the following statements is true?
• A.

Gold can scratch glass.

• B.

Gold can scratch a knife blade.

• C.

A knife blade can scratch glass.

• D.

Glass can scratch a knife blade.

• 6.
What ecological relationship is there between an organism that benefits and an organism that is neither benefited nor harmed?
• A.

Parasitism

• B.

Commensalism

• C.

Mutualism

• D.

Competition

• 7.
Cats are classified as follows: class Mammalia, order Carnivora, family Felidae, genus Felis, species domesticus. How is the scientific name written?
• A.

Domesticus felis

• B.

Felidae felis

• C.

Felis Domesticus

• D.

Felis domesticus

• 8.
A cell placed in saline water is _____ with respect to its environment.
• A.

Hypertonic

• B.

Isotonic

• C.

Equiosmotic

• D.

Hypotonic

• 9.
What pair of structures best represents homology?
• A.

Tail of a fish and tail of a dog

• B.

Wings of a bat and forelimbs of a human

• C.

Proboscis of a mosquito and trunk of an elephant

• D.

Epidermis of a plant and epidermis of a cat

• 10.
Aya conducted an experiment. She placed a small plant in a dark room with a lamp as a light source. After a few days, she noticed that the plant started growing towards the light. What phenomenon was Aya able to show?
• A.

Phototropism

• B.

Thigmotropism

• C.

• D.

Sleep movement

• 11.
Which of the following is the correct order of the layers of the skin starting from the outside?
• A.

Dermis; epidermis; hypodermis

• B.

Dermis; hypodermis; epidermis

• C.

Epidermis; dermis; hypodermis

• D.

Hypodermis; dermis; epidermis

• 12.
Trace the pathway of blood through the heart.
• A.

L ventricle; L atrium; lungs; R ventricle; R atrium

• B.

R atrium; L ventricle; lungs; L atrium; R ventricle

• C.

L ventricle; R atrium; lungs; R ventricle; L atrium

• D.

R atrium; R ventricle; lungs; L atrium; L ventricle

• 13.
Latent heat of fusion is the heat needed to change a _____ to a _____.
• A.

Solid; liquid

• B.

Solid; gas

• C.

Liquid; gas

• D.

Gas; liquid

• 14.
Which of the following is NOT a chemical property?
• A.

Flammability

• B.

PH

• C.

Electronegativity

• D.

Energy

• 15.
Which is the best method for separating the components of a mixture of sand in a glass of water?
• A.

Precipitation

• B.

Centrifugation

• C.

Distillation

• D.

Filtration

• 16.
In the periodic table, ionization energy _____ from left to right and _____ from top to bottom.
• A.

Increases; decreases

• B.

Decreases; increases

• C.

Increases; increases

• D.

Decreases; decreases

• 17.
The chemical reaction KNO3 à KNO2 + O2 is an example of a _____ reaction.
• A.

Metathesis

• B.

Substitution

• C.

Decomposition

• D.

Composition

• 18.
What is the coefficient of NaCl when the reaction below is balanced?   FeCl2 + Na3PO4 à Fe3(PO4)2 + NaCl
• A.

6

• B.

7

• C.

8

• D.

9

• 19.
_____ states that the volume and the temperature of a gas are directly proportional to each other when the pressure and the number of moles are held constant.
• A.

• B.

Boyle’s law

• C.

Charles’s law

• D.

Gay-Lussac’s law

• 20.
Faye needs to prepare 500 mL of a 0.5 M solution of H2SO4 from the stock solution of 1 M H2SO4. How much of the stock solution will she use?
• A.

100 mL

• B.

250 mL

• C.

300 mL

• D.

400 mL

• 21.
One way to increase the cooling of hot soup is by placing your spoon in the bowl. How is heat transferred in this way?
• A.

Conduction

• B.

Convection

• C.

• D.

All of the above

• 22.
Which of the following statements is NOT true for a catalyst?
• A.

It lowers the activation energy of a reaction.

• B.

It is necessary for a reaction to occur.

• C.

It increases the rate of a reaction.

• D.

Its concentration does not change.

• 23.
A police officer living on a planet with no air resistance drops a pair of handcuffs and a handkerchief from the same height at the same time. Which one will reach the ground first?
• A.

The handkerchief

• B.

The handcuffs

• C.

They will both hit the ground at the same time

• D.

The answer depends on how far above the ground they were dropped from

• 24.
Sound is a form of energy produced by the vibration of matter. When an object produces sound, the vibration travels through space as _____.
• A.

Matter

• B.

Molecules

• C.

Sound waves

• D.

• 25.
Which of the following statements is true about light?
• A.

Light has the property of particles only.

• B.

Light is produced by excited atoms.

• C.

Light striking your eyes will not allow you to see.

• D.

Light energy cannot be measured.

• 26.
The average velocity and the instantaneous velocity of an object will be the same if _____.
• A.

The object's acceleration is constant

• B.

The object's velocity is always positive

• C.

The object's acceleration is zero

• D.

The object’s velocity is always negative

• 27.
Three forces, each separated from one another by 120 degrees, yield a net force of 0. What can be said about the magnitude of the forces?
• A.

• B.

The sum of the magnitude of two forces must equal the magnitude of the third force.

• C.

They are all equal.

• D.

The given information is not enough.

• 28.
The center of mass is defined as _____.
• A.

The position of the most massive particle in a given system

• B.

The point at which a net external force would produce the same acceleration of the system as if it were applied to each particle individually

• C.

The average position of each particle

• D.

The point equidistant from all particles in a system

• 29.
The total momentum of a system of particles is conserved only if _____.
• A.

There are no interactions between the particles

• B.

The velocity of the center of mass of the system is constant

• C.

The velocity of the center of mass of the system is zero

• D.

The system conserves energy