Test Prep OAT Online Practice Questions and Exam Preparation

Test Prep OAT Online Questions & Answers

• Question 11:

  Which of the following statements about refraction is true?

  A. Refraction means a change in direction of the wave.
  B. The angle of reflection equals the angle of refraction.
  C. The frequency in a refracted wave changes.
  D. The phase of a refracted wave changes.
  A. Refraction means a change in direction of the wave.

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  Refraction occurs when a wave enters a new medium. The boundary between the old medium and the new medium produces a reflected wave and a refracted wave. Since the medium is different, the speed and direction of the refracted wave changes. This changes the wavelength, but the frequency remains the same. The angle of reflection depends on the angle of incidence of the wave that strikes the boundary. The angle of refraction depends partly on this angle of incidence, but also on the indices of refraction of the two substances. Although refraction is defined as a wave changing direction when it enters a new substance, a wave will not change direction if it enters this new medium exactly perpendicular to the surface.

• Question 12:

  What is the percent of oxygen by mass in FeCr2O4?

  A. 6.4%
  B. 12.5%
  C. 19.3%
  D. 22.4%
  E. 28.6%
  E. 28.6%

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  It necessary to utilize the periodic table (provided in the exam) and adds up the entire molecular weight of FeCr2O4.

  Fe = 55.8 Cr = 52 (×2) O = 16 (×4)

  Total molecular weight: ~223.85

  Divide the oxygen species by this: (16 × 4) / (223.85) = 0.286

  Multiply by a 100 to get the percentage form: 0.286 × 100 = 28.6%

• Question 13:

  Name this compound:

  

  A. m-Bromotoluene
  B. o-Bromotoluene
  C. p-Bromotoluene
  D. p-Bromoxylene
  E. m-Bromocyclohexane
  C. p-Bromotoluene

• Question 14:

  Which of the following is false in regards to food pyramids?

  A. As the pyramid ascends, there is less energy.
  B. As the pyramid ascends, there is less mass.
  C. As the pyramid descends, there is more mass.
  D. As the pyramid descends, there is fewer organisms.
  E. Algae would be found at the bottom of the pyramid.
  D. As the pyramid descends, there is fewer organisms.

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  As the pyramid descends, there are more organisms.

• Question 15:

  The molar solubility of an hypothetical salt, AB, is 3.0 × 10−3. Find the Ksp

  A. 27 × 10−9
  B. 9 × 10−6
  C. 6 × 10−3
  D. 1.5 × 10−3
  E. 3.0 × 10−3
  B. 9 × 10−6

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• Question 16:

  A man lifts a 200 lb rock from the floor to a height 6 feet of the ground. How much work must the man perform in order to keep the object in the air?

  A. 1200 ft lb
  B. 33.3 ft lb
  C. 0 ft lb
  D. 2000 ft lb
  E. Not enough information is provided
  C. 0 ft lb

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  Work = Force ?Distance. Because the question asks about the work performed to keep the rock above the man, the rock is not being displaced, and thus, no work is being done as displacement = 0. Work is only being done in reference to the actual displacement movement. Be careful for questions that give you meaningless information in relation to the answer.

• Question 17:

  What is the end product for the following set of reactions:

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  E. Option E
  C. Option C

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  The correct answer is C for all the following reactions. Answer choice A illustrates the product after the first reaction. Answer choice B illustrates the product after the second reaction, and finally C shows the product for the last reaction.

• Question 18:

  You blow up a rubber balloon and hold the opening tight with your fingers. You then release your fingers, causing air to blow out of the balloon. This pushes the balloon forward, causing the balloon shoots across the room. Which of Newton's laws best explains the cause of this motion?

  A. First law
  B. Second law
  C. Third law
  D. Law of gravity
  C. Third law

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  All three laws are operating, but the third law (forces come in equal and opposite pairs) best explains the motion. The first law (inertia) is shown from the fact that the balloon doesn't move until a force acts upon it. The second law (F = ma) is shown because you can see the force and the acceleration. The force comes from the contraction of the rubber balloon. The stretched rubber exerts a force on the air inside the balloon. This causes the air to accelerate in accordance with the second law. You can't see this acceleration because the air is invisible and because it is all the air in the room that the balloon is exerting a force on. However, the air in the room exerts and equal and opposite force on the balloon (this is Newton's third law), which causes the balloon to accelerate in the direction it did.

• Question 19:

  A white rabbit mates with a black rabbit, resulting in a mix of black and white offspring. This is an example of:

  A. Epistasis
  B. Incomplete Dominance
  C. Complete Dominance
  D. Co-dominance
  E. Pleiotropy
  D. Co-dominance

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  When both parental traits are expressed, this is an example of co-dominance. Incomplete dominance would reveal offspring to have grey color.

• Question 20:

  What is the functional unit of the liver called?

  A. Nephron
  B. Lobule
  C. Osteon
  D. Sarcomere
  E. Alveoli
  B. Lobule